diff --git a/drivers/usb/tcpm/tcpm.c b/drivers/usb/tcpm/tcpm.c
new file mode 100644
index 0000000..0aee57c
--- /dev/null
+++ b/drivers/usb/tcpm/tcpm.c
@@ -0,0 +1,2288 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2015-2017 Google, Inc
+ *
+ * USB Power Delivery protocol stack.
+ */
+
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <dm/device-internal.h>
+#include <dm/devres.h>
+#include <linux/compat.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/iopoll.h>
+#include <time.h>
+#include <usb/tcpm.h>
+#include "tcpm-internal.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+const char * const tcpm_states[] = {
+	FOREACH_TCPM_STATE(GENERATE_TCPM_STRING)
+};
+
+const char * const typec_pd_rev_name[] = {
+	[PD_REV10]		= "rev1",
+	[PD_REV20]		= "rev2",
+	[PD_REV30]		= "rev3",
+};
+
+const char * const typec_role_name[] = {
+	[TYPEC_SINK]		= "sink",
+	[TYPEC_SOURCE]		= "source",
+};
+
+const char * const typec_data_role_name[] = {
+	[TYPEC_DEVICE]		= "device",
+	[TYPEC_HOST]		= "host",
+};
+
+const char * const typec_orientation_name[] = {
+	[TYPEC_ORIENTATION_NONE]	= "none",
+	[TYPEC_ORIENTATION_NORMAL]	= "normal",
+	[TYPEC_ORIENTATION_REVERSE]	= "reverse",
+};
+
+const char * const typec_cc_status_name[] = {
+	[TYPEC_CC_OPEN]		= "open",
+	[TYPEC_CC_RA]		= "ra",
+	[TYPEC_CC_RD]		= "rd",
+	[TYPEC_CC_RP_DEF]	= "rp-def",
+	[TYPEC_CC_RP_1_5]	= "rp-1.5",
+	[TYPEC_CC_RP_3_0]	= "rp-3.0",
+};
+
+static inline bool tcpm_cc_is_sink(enum typec_cc_status cc)
+{
+	return cc == TYPEC_CC_RP_DEF ||
+	       cc == TYPEC_CC_RP_1_5 ||
+	       cc == TYPEC_CC_RP_3_0;
+}
+
+static inline bool tcpm_port_is_sink(struct tcpm_port *port)
+{
+	bool cc1_is_snk = tcpm_cc_is_sink(port->cc1);
+	bool cc2_is_snk = tcpm_cc_is_sink(port->cc2);
+
+	return (cc1_is_snk && !cc2_is_snk) ||
+	       (cc2_is_snk && !cc1_is_snk);
+}
+
+static inline bool tcpm_cc_is_source(enum typec_cc_status cc)
+{
+	return cc == TYPEC_CC_RD;
+}
+
+static inline bool tcpm_port_is_source(struct tcpm_port *port)
+{
+	bool cc1_is_src = tcpm_cc_is_source(port->cc1);
+	bool cc2_is_src = tcpm_cc_is_source(port->cc2);
+
+	return (cc1_is_src && !cc2_is_src) ||
+	       (cc2_is_src && !cc1_is_src);
+}
+
+static inline bool tcpm_try_src(struct tcpm_port *port)
+{
+	return port->try_role == TYPEC_SOURCE &&
+	       port->port_type == TYPEC_PORT_DRP;
+}
+
+static inline void tcpm_reset_event_cnt(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	port->poll_event_cnt = 0;
+}
+
+static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
+{
+	if (port->port_type == TYPEC_PORT_DRP) {
+		if (port->try_role == TYPEC_SINK)
+			return SNK_UNATTACHED;
+		else if (port->try_role == TYPEC_SOURCE)
+			return SRC_UNATTACHED;
+	} else if (port->port_type == TYPEC_PORT_SNK) {
+		return SNK_UNATTACHED;
+	}
+	return SRC_UNATTACHED;
+}
+
+static bool tcpm_port_is_disconnected(struct tcpm_port *port)
+{
+	return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
+		port->cc2 == TYPEC_CC_OPEN) ||
+	       (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
+				    port->cc1 == TYPEC_CC_OPEN) ||
+				   (port->polarity == TYPEC_POLARITY_CC2 &&
+				    port->cc2 == TYPEC_CC_OPEN)));
+}
+
+static void tcpm_set_cc(struct udevice *dev, enum typec_cc_status cc)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	dev_dbg(dev, "TCPM: set cc = %d\n", cc);
+	port->cc_req = cc;
+	drvops->set_cc(dev, cc);
+}
+
+/*
+ * Determine RP value to set based on maximum current supported
+ * by a port if configured as source.
+ * Returns CC value to report to link partner.
+ */
+static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
+{
+	const u32 *src_pdo = port->src_pdo;
+	int nr_pdo = port->nr_src_pdo;
+	int i;
+
+	/*
+	 * Search for first entry with matching voltage.
+	 * It should report the maximum supported current.
+	 */
+	for (i = 0; i < nr_pdo; i++) {
+		const u32 pdo = src_pdo[i];
+
+		if (pdo_type(pdo) == PDO_TYPE_FIXED &&
+		    pdo_fixed_voltage(pdo) == 5000) {
+			unsigned int curr = pdo_max_current(pdo);
+
+			if (curr >= 3000)
+				return TYPEC_CC_RP_3_0;
+			else if (curr >= 1500)
+				return TYPEC_CC_RP_1_5;
+			return TYPEC_CC_RP_DEF;
+		}
+	}
+
+	return TYPEC_CC_RP_DEF;
+}
+
+static void tcpm_check_and_run_delayed_work(struct udevice *dev);
+
+static bool tcpm_transmit_helper(struct udevice *dev)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	drvops->poll_event(dev);
+	udelay(500);
+	tcpm_check_and_run_delayed_work(dev);
+	return port->tx_complete;
+}
+
+static int tcpm_pd_transmit(struct udevice *dev,
+			    enum tcpm_transmit_type type,
+			    const struct pd_message *msg)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	u32 timeout_us = PD_T_TCPC_TX_TIMEOUT * 1000;
+	bool tx_complete;
+	int ret;
+
+	if (msg)
+		dev_dbg(dev, "TCPM: PD TX, header: %#x\n",
+			le16_to_cpu(msg->header));
+	else
+		dev_dbg(dev, "TCPM: PD TX, type: %#x\n", type);
+
+	port->tx_complete = false;
+	ret = drvops->pd_transmit(dev, type, msg, port->negotiated_rev);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * At this point we basically need to block until the TCPM controller
+	 * returns successful transmission. Since this is usually done using
+	 * the generic interrupt status bits, we poll for any events. That
+	 * will clear the interrupt status, so we also need to process any
+	 * of the incoming events. This means we will do more processing and
+	 * thus let's give everything a bit more time.
+	 */
+	timeout_us *= 5;
+	ret = read_poll_timeout(tcpm_transmit_helper, tx_complete,
+				!tx_complete, false, timeout_us, dev);
+	if (ret < 0) {
+		dev_err(dev, "TCPM: PD transmit data failed: %d\n", ret);
+		return ret;
+	}
+
+	switch (port->tx_status) {
+	case TCPC_TX_SUCCESS:
+		port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
+		break;
+	case TCPC_TX_DISCARDED:
+		ret = -EAGAIN;
+		break;
+	case TCPC_TX_FAILED:
+	default:
+		ret = -EIO;
+		break;
+	}
+
+	return ret;
+}
+
+void tcpm_pd_transmit_complete(struct udevice *dev,
+			       enum tcpm_transmit_status status)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	dev_dbg(dev, "TCPM: PD TX complete, status: %u\n", status);
+	tcpm_reset_event_cnt(dev);
+	port->tx_status = status;
+	port->tx_complete = true;
+}
+
+static int tcpm_set_polarity(struct udevice *dev,
+			     enum typec_cc_polarity polarity)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	int ret;
+
+	dev_dbg(dev, "TCPM: set polarity = %d\n", polarity);
+
+	if (drvops->set_polarity) {
+		ret = drvops->set_polarity(dev, polarity);
+		if (ret < 0)
+			return ret;
+	}
+
+	port->polarity = polarity;
+
+	return 0;
+}
+
+static int tcpm_set_vconn(struct udevice *dev, bool enable)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	int ret;
+
+	dev_dbg(dev, "TCPM: set vconn = %d\n", enable);
+
+	ret = drvops->set_vconn(dev, enable);
+	if (!ret)
+		port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
+
+	return ret;
+}
+
+static inline u32 tcpm_get_current_limit(struct tcpm_port *port)
+{
+	switch (port->polarity ? port->cc2 : port->cc1) {
+	case TYPEC_CC_RP_1_5:
+		return 1500;
+	case TYPEC_CC_RP_3_0:
+		return 3000;
+	case TYPEC_CC_RP_DEF:
+	default:
+		return 0;
+	}
+}
+
+static int tcpm_set_current_limit(struct udevice *dev, u32 max_ma, u32 mv)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	int ret = -EOPNOTSUPP;
+
+	dev_info(dev, "TCPM: set voltage limit = %u mV\n", mv);
+	dev_info(dev, "TCPM: set current limit = %u mA\n", max_ma);
+
+	port->supply_voltage = mv;
+	port->current_limit = max_ma;
+
+	return ret;
+}
+
+static int tcpm_set_attached_state(struct udevice *dev, bool attached)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	return drvops->set_roles(dev, attached, port->pwr_role,
+				 port->data_role);
+}
+
+static int tcpm_set_roles(struct udevice *dev, bool attached,
+			  enum typec_role role, enum typec_data_role data)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	int ret;
+
+	ret = drvops->set_roles(dev, attached, role, data);
+	if (ret < 0)
+		return ret;
+
+	port->pwr_role = role;
+	port->data_role = data;
+
+	return 0;
+}
+
+static int tcpm_pd_send_source_caps(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	struct pd_message msg;
+	int i;
+
+	memset(&msg, 0, sizeof(msg));
+
+	if (!port->nr_src_pdo) {
+		/* No source capabilities defined, sink only */
+		msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
+					  port->pwr_role,
+					  port->data_role,
+					  port->negotiated_rev,
+					  port->message_id, 0);
+	} else {
+		msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
+					  port->pwr_role,
+					  port->data_role,
+					  port->negotiated_rev,
+					  port->message_id,
+					  port->nr_src_pdo);
+	}
+
+	for (i = 0; i < port->nr_src_pdo; i++)
+		msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
+
+	return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg);
+}
+
+static int tcpm_pd_send_sink_caps(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	struct pd_message msg;
+	unsigned int i;
+
+	memset(&msg, 0, sizeof(msg));
+
+	if (!port->nr_snk_pdo) {
+		/* No sink capabilities defined, source only */
+		msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
+					  port->pwr_role,
+					  port->data_role,
+					  port->negotiated_rev,
+					  port->message_id, 0);
+	} else {
+		msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
+					  port->pwr_role,
+					  port->data_role,
+					  port->negotiated_rev,
+					  port->message_id,
+					  port->nr_snk_pdo);
+	}
+
+	for (i = 0; i < port->nr_snk_pdo; i++)
+		msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
+
+	return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg);
+}
+
+static void tcpm_state_machine(struct udevice *dev);
+
+static inline void tcpm_timer_uninit(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	port->delay_target = 0;
+}
+
+static void tcpm_timer_init(struct udevice *dev, uint32_t ms)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	unsigned long time_us = ms * 1000;
+
+	port->delay_target = timer_get_us() + time_us;
+}
+
+static void tcpm_check_and_run_delayed_work(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	/* no delayed state changes scheduled */
+	if (port->delay_target == 0)
+		return;
+
+	/* it's not yet time */
+	if (timer_get_us() < port->delay_target)
+		return;
+
+	tcpm_timer_uninit(dev);
+	tcpm_state_machine(dev);
+}
+
+static void mod_tcpm_delayed_work(struct udevice *dev, unsigned int delay_ms)
+{
+	if (delay_ms) {
+		tcpm_timer_init(dev, delay_ms);
+	} else {
+		tcpm_timer_uninit(dev);
+		tcpm_state_machine(dev);
+	}
+}
+
+static void tcpm_set_state(struct udevice *dev, enum tcpm_state state,
+			   unsigned int delay_ms)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	if (delay_ms) {
+		dev_dbg(dev, "TCPM: pending state change %s -> %s @ %u ms [%s]\n",
+			tcpm_states[port->state], tcpm_states[state], delay_ms,
+			typec_pd_rev_name[port->negotiated_rev]);
+		port->delayed_state = state;
+		mod_tcpm_delayed_work(dev, delay_ms);
+		port->delay_ms = delay_ms;
+	} else {
+		dev_dbg(dev, "TCPM: state change %s -> %s\n",
+			tcpm_states[port->state], tcpm_states[state]);
+		port->delayed_state = INVALID_STATE;
+		port->prev_state = port->state;
+		port->state = state;
+		/*
+		 * Don't re-queue the state machine work item if we're currently
+		 * in the state machine and we're immediately changing states.
+		 * tcpm_state_machine_work() will continue running the state
+		 * machine.
+		 */
+		if (!port->state_machine_running)
+			mod_tcpm_delayed_work(dev, 0);
+	}
+}
+
+static void tcpm_set_state_cond(struct udevice *dev, enum tcpm_state state,
+				unsigned int delay_ms)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	if (port->enter_state == port->state)
+		tcpm_set_state(dev, state, delay_ms);
+	else
+		dev_dbg(dev, "TCPM: skipped %sstate change %s -> %s [%u ms], context state %s [%s]\n",
+			delay_ms ? "delayed " : "",
+			tcpm_states[port->state], tcpm_states[state],
+			delay_ms, tcpm_states[port->enter_state],
+			typec_pd_rev_name[port->negotiated_rev]);
+}
+
+static void tcpm_queue_message(struct udevice *dev,
+			       enum pd_msg_request message)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	port->queued_message = message;
+	mod_tcpm_delayed_work(dev, 0);
+}
+
+enum pdo_err {
+	PDO_NO_ERR,
+	PDO_ERR_NO_VSAFE5V,
+	PDO_ERR_VSAFE5V_NOT_FIRST,
+	PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
+	PDO_ERR_FIXED_NOT_SORTED,
+	PDO_ERR_VARIABLE_BATT_NOT_SORTED,
+	PDO_ERR_DUPE_PDO,
+	PDO_ERR_PPS_APDO_NOT_SORTED,
+	PDO_ERR_DUPE_PPS_APDO,
+};
+
+static const char * const pdo_err_msg[] = {
+	[PDO_ERR_NO_VSAFE5V] =
+	" err: source/sink caps should at least have vSafe5V",
+	[PDO_ERR_VSAFE5V_NOT_FIRST] =
+	" err: vSafe5V Fixed Supply Object Shall always be the first object",
+	[PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
+	" err: PDOs should be in the following order: Fixed; Battery; Variable",
+	[PDO_ERR_FIXED_NOT_SORTED] =
+	" err: Fixed supply pdos should be in increasing order of their fixed voltage",
+	[PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
+	" err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
+	[PDO_ERR_DUPE_PDO] =
+	" err: Variable/Batt supply pdos cannot have same min/max voltage",
+	[PDO_ERR_PPS_APDO_NOT_SORTED] =
+	" err: Programmable power supply apdos should be in increasing order of their maximum voltage",
+	[PDO_ERR_DUPE_PPS_APDO] =
+	" err: Programmable power supply apdos cannot have same min/max voltage and max current",
+};
+
+static enum pdo_err tcpm_caps_err(struct udevice *dev, const u32 *pdo,
+				  unsigned int nr_pdo)
+{
+	unsigned int i;
+
+	/* Should at least contain vSafe5v */
+	if (nr_pdo < 1)
+		return PDO_ERR_NO_VSAFE5V;
+
+	/* The vSafe5V Fixed Supply Object Shall always be the first object */
+	if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
+	    pdo_fixed_voltage(pdo[0]) != VSAFE5V)
+		return PDO_ERR_VSAFE5V_NOT_FIRST;
+
+	for (i = 1; i < nr_pdo; i++) {
+		if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
+			return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
+		} else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
+			enum pd_pdo_type type = pdo_type(pdo[i]);
+
+			switch (type) {
+			/*
+			 * The remaining Fixed Supply Objects, if
+			 * present, shall be sent in voltage order;
+			 * lowest to highest.
+			 */
+			case PDO_TYPE_FIXED:
+				if (pdo_fixed_voltage(pdo[i]) <=
+				    pdo_fixed_voltage(pdo[i - 1]))
+					return PDO_ERR_FIXED_NOT_SORTED;
+				break;
+			/*
+			 * The Battery Supply Objects and Variable
+			 * supply, if present shall be sent in Minimum
+			 * Voltage order; lowest to highest.
+			 */
+			case PDO_TYPE_VAR:
+			case PDO_TYPE_BATT:
+				if (pdo_min_voltage(pdo[i]) <
+				    pdo_min_voltage(pdo[i - 1]))
+					return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
+				else if ((pdo_min_voltage(pdo[i]) ==
+					  pdo_min_voltage(pdo[i - 1])) &&
+					 (pdo_max_voltage(pdo[i]) ==
+					  pdo_max_voltage(pdo[i - 1])))
+					return PDO_ERR_DUPE_PDO;
+				break;
+			/*
+			 * The Programmable Power Supply APDOs, if present,
+			 * shall be sent in Maximum Voltage order;
+			 * lowest to highest.
+			 */
+			case PDO_TYPE_APDO:
+				if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
+					break;
+
+				if (pdo_pps_apdo_max_voltage(pdo[i]) <
+				    pdo_pps_apdo_max_voltage(pdo[i - 1]))
+					return PDO_ERR_PPS_APDO_NOT_SORTED;
+				else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
+					  pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
+					 pdo_pps_apdo_max_voltage(pdo[i]) ==
+					  pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
+					 pdo_pps_apdo_max_current(pdo[i]) ==
+					  pdo_pps_apdo_max_current(pdo[i - 1]))
+					return PDO_ERR_DUPE_PPS_APDO;
+				break;
+			default:
+				dev_err(dev, "TCPM: Unknown pdo type\n");
+			}
+		}
+	}
+
+	return PDO_NO_ERR;
+}
+
+static int tcpm_validate_caps(struct udevice *dev, const u32 *pdo,
+			      unsigned int nr_pdo)
+{
+	enum pdo_err err_index = tcpm_caps_err(dev, pdo, nr_pdo);
+
+	if (err_index != PDO_NO_ERR) {
+		dev_err(dev, "TCPM:%s\n", pdo_err_msg[err_index]);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * PD (data, control) command handling functions
+ */
+static inline enum tcpm_state ready_state(struct tcpm_port *port)
+{
+	if (port->pwr_role == TYPEC_SOURCE)
+		return SRC_READY;
+	else
+		return SNK_READY;
+}
+
+static void tcpm_pd_data_request(struct udevice *dev,
+				 const struct pd_message *msg)
+{
+	enum pd_data_msg_type type = pd_header_type_le(msg->header);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	unsigned int cnt = pd_header_cnt_le(msg->header);
+	unsigned int rev = pd_header_rev_le(msg->header);
+	unsigned int i;
+
+	switch (type) {
+	case PD_DATA_SOURCE_CAP:
+		for (i = 0; i < cnt; i++)
+			port->source_caps[i] = le32_to_cpu(msg->payload[i]);
+
+		port->nr_source_caps = cnt;
+
+		tcpm_validate_caps(dev, port->source_caps,
+				   port->nr_source_caps);
+
+		/*
+		 * Adjust revision in subsequent message headers, as required,
+		 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
+		 * support Rev 1.0 so just do nothing in that scenario.
+		 */
+		if (rev == PD_REV10)
+			break;
+
+		if (rev < PD_MAX_REV)
+			port->negotiated_rev = rev;
+
+		if ((pdo_type(port->source_caps[0]) == PDO_TYPE_FIXED) &&
+		    (port->source_caps[0] & PDO_FIXED_DUAL_ROLE) &&
+		    (port->source_caps[0] & PDO_FIXED_DATA_SWAP)) {
+			/* Dual role power and data, eg: self-powered Type-C */
+			port->wait_dr_swap_message = true;
+		} else {
+			/* Non-Dual role power, eg: adapter */
+			port->wait_dr_swap_message = false;
+		}
+
+		/*
+		 * This message may be received even if VBUS is not
+		 * present. This is quite unexpected; see USB PD
+		 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
+		 * However, at the same time, we must be ready to
+		 * receive this message and respond to it 15ms after
+		 * receiving PS_RDY during power swap operations, no matter
+		 * if VBUS is available or not (USB PD specification,
+		 * section 6.5.9.2).
+		 * So we need to accept the message either way,
+		 * but be prepared to keep waiting for VBUS after it was
+		 * handled.
+		 */
+		tcpm_set_state(dev, SNK_NEGOTIATE_CAPABILITIES, 0);
+		break;
+	case PD_DATA_REQUEST:
+		/*
+		 * Adjust revision in subsequent message headers, as required,
+		 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
+		 * support Rev 1.0 so just reject in that scenario.
+		 */
+		if (rev == PD_REV10) {
+			tcpm_queue_message(dev, PD_MSG_CTRL_REJECT);
+			break;
+		}
+
+		if (rev < PD_MAX_REV)
+			port->negotiated_rev = rev;
+
+		port->sink_request = le32_to_cpu(msg->payload[0]);
+
+		tcpm_set_state(dev, SRC_NEGOTIATE_CAPABILITIES, 0);
+		break;
+	case PD_DATA_SINK_CAP:
+		/* We don't do anything with this at the moment... */
+		for (i = 0; i < cnt; i++)
+			port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
+
+		port->nr_sink_caps = cnt;
+		break;
+	default:
+		break;
+	}
+}
+
+static void tcpm_pd_ctrl_request(struct udevice *dev,
+				 const struct pd_message *msg)
+{
+	enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	enum tcpm_state next_state;
+
+	switch (type) {
+	case PD_CTRL_GOOD_CRC:
+	case PD_CTRL_PING:
+		break;
+	case PD_CTRL_GET_SOURCE_CAP:
+		switch (port->state) {
+		case SRC_READY:
+		case SNK_READY:
+			tcpm_queue_message(dev, PD_MSG_DATA_SOURCE_CAP);
+			break;
+		default:
+			tcpm_queue_message(dev, PD_MSG_CTRL_REJECT);
+			break;
+		}
+		break;
+	case PD_CTRL_GET_SINK_CAP:
+		switch (port->state) {
+		case SRC_READY:
+		case SNK_READY:
+			tcpm_queue_message(dev, PD_MSG_DATA_SINK_CAP);
+			break;
+		default:
+			tcpm_queue_message(dev, PD_MSG_CTRL_REJECT);
+			break;
+		}
+		break;
+	case PD_CTRL_GOTO_MIN:
+		break;
+	case PD_CTRL_PS_RDY:
+		switch (port->state) {
+		case SNK_TRANSITION_SINK:
+			if (port->vbus_present) {
+				tcpm_set_current_limit(dev,
+						       port->req_current_limit,
+						       port->req_supply_voltage);
+				port->explicit_contract = true;
+				tcpm_set_state(dev, SNK_READY, 0);
+			} else {
+				/*
+				 * Seen after power swap. Keep waiting for VBUS
+				 * in a transitional state.
+				 */
+				tcpm_set_state(dev,
+					       SNK_TRANSITION_SINK_VBUS, 0);
+			}
+			break;
+		default:
+			break;
+		}
+		break;
+	case PD_CTRL_REJECT:
+	case PD_CTRL_WAIT:
+	case PD_CTRL_NOT_SUPP:
+		switch (port->state) {
+		case SNK_NEGOTIATE_CAPABILITIES:
+			/* USB PD specification, Figure 8-43 */
+			if (port->explicit_contract)
+				next_state = SNK_READY;
+			else
+				next_state = SNK_WAIT_CAPABILITIES;
+
+			tcpm_set_state(dev, next_state, 0);
+			break;
+		default:
+			break;
+		}
+		break;
+	case PD_CTRL_ACCEPT:
+		switch (port->state) {
+		case SNK_NEGOTIATE_CAPABILITIES:
+			tcpm_set_state(dev, SNK_TRANSITION_SINK, 0);
+			break;
+		case SOFT_RESET_SEND:
+			port->message_id = 0;
+			port->rx_msgid = -1;
+			if (port->pwr_role == TYPEC_SOURCE)
+				next_state = SRC_SEND_CAPABILITIES;
+			else
+				next_state = SNK_WAIT_CAPABILITIES;
+			tcpm_set_state(dev, next_state, 0);
+			break;
+		default:
+			break;
+		}
+		break;
+	case PD_CTRL_SOFT_RESET:
+		tcpm_set_state(dev, SOFT_RESET, 0);
+		break;
+	case PD_CTRL_DR_SWAP:
+		if (port->port_type != TYPEC_PORT_DRP) {
+			tcpm_queue_message(dev, PD_MSG_CTRL_REJECT);
+			break;
+		}
+		/*
+		 * 6.3.9: If an alternate mode is active, a request to swap
+		 * alternate modes shall trigger a port reset.
+		 */
+		switch (port->state) {
+		case SRC_READY:
+		case SNK_READY:
+			tcpm_set_state(dev, DR_SWAP_ACCEPT, 0);
+			break;
+		default:
+			tcpm_queue_message(dev, PD_MSG_CTRL_WAIT);
+			break;
+		}
+		break;
+	case PD_CTRL_PR_SWAP:
+	case PD_CTRL_VCONN_SWAP:
+	case PD_CTRL_GET_SOURCE_CAP_EXT:
+	case PD_CTRL_GET_STATUS:
+	case PD_CTRL_FR_SWAP:
+	case PD_CTRL_GET_PPS_STATUS:
+	case PD_CTRL_GET_COUNTRY_CODES:
+		/* Currently not supported */
+		dev_err(dev, "TCPM: Currently not supported type %#x\n", type);
+		tcpm_queue_message(dev, PD_MSG_CTRL_NOT_SUPP);
+		break;
+	default:
+		dev_err(dev, "TCPM: Unrecognized ctrl message type %#x\n", type);
+		break;
+	}
+}
+
+static void tcpm_pd_rx_handler(struct udevice *dev,
+			       const struct pd_message *msg)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	unsigned int cnt = pd_header_cnt_le(msg->header);
+	bool remote_is_host, local_is_host;
+
+	dev_dbg(dev, "TCPM: PD RX, header: %#x [%d]\n",
+		le16_to_cpu(msg->header), port->attached);
+
+	if (port->attached) {
+		enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
+		unsigned int msgid = pd_header_msgid_le(msg->header);
+
+		/*
+		 * USB PD standard, 6.6.1.2:
+		 * "... if MessageID value in a received Message is the
+		 * same as the stored value, the receiver shall return a
+		 * GoodCRC Message with that MessageID value and drop
+		 * the Message (this is a retry of an already received
+		 * Message). Note: this shall not apply to the Soft_Reset
+		 * Message which always has a MessageID value of zero."
+		 */
+		if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
+			return;
+		port->rx_msgid = msgid;
+
+		/*
+		 * If both ends believe to be DFP/host, we have a data role
+		 * mismatch.
+		 */
+		remote_is_host = !!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE);
+		local_is_host = port->data_role == TYPEC_HOST;
+		if (remote_is_host == local_is_host) {
+			dev_err(dev, "TCPM: data role mismatch, initiating error recovery\n");
+			tcpm_set_state(dev, ERROR_RECOVERY, 0);
+		} else {
+			if (cnt)
+				tcpm_pd_data_request(dev, msg);
+			else
+				tcpm_pd_ctrl_request(dev, msg);
+		}
+	}
+}
+
+void tcpm_pd_receive(struct udevice *dev, const struct pd_message *msg)
+{
+	tcpm_reset_event_cnt(dev);
+	tcpm_pd_rx_handler(dev, msg);
+}
+
+static int tcpm_pd_send_control(struct udevice *dev,
+				enum pd_ctrl_msg_type type)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	struct pd_message msg;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.header = PD_HEADER_LE(type, port->pwr_role,
+				  port->data_role,
+				  port->negotiated_rev,
+				  port->message_id, 0);
+
+	return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg);
+}
+
+/*
+ * Send queued message without affecting state.
+ * Return true if state machine should go back to sleep,
+ * false otherwise.
+ */
+static bool tcpm_send_queued_message(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	enum pd_msg_request queued_message;
+	int max_messages = 100;
+
+	do {
+		queued_message = port->queued_message;
+		port->queued_message = PD_MSG_NONE;
+		max_messages--;
+
+		switch (queued_message) {
+		case PD_MSG_CTRL_WAIT:
+			tcpm_pd_send_control(dev, PD_CTRL_WAIT);
+			break;
+		case PD_MSG_CTRL_REJECT:
+			tcpm_pd_send_control(dev, PD_CTRL_REJECT);
+			break;
+		case PD_MSG_CTRL_NOT_SUPP:
+			tcpm_pd_send_control(dev, PD_CTRL_NOT_SUPP);
+			break;
+		case PD_MSG_DATA_SINK_CAP:
+			tcpm_pd_send_sink_caps(dev);
+			break;
+		case PD_MSG_DATA_SOURCE_CAP:
+			tcpm_pd_send_source_caps(dev);
+			break;
+		default:
+			break;
+		}
+	} while (max_messages > 0 && port->queued_message != PD_MSG_NONE);
+
+	if (!max_messages)
+		dev_err(dev, "Aborted sending of too many queued messages\n");
+
+	return false;
+}
+
+static int tcpm_pd_check_request(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	u32 pdo, rdo = port->sink_request;
+	unsigned int max, op, pdo_max, index;
+	enum pd_pdo_type type;
+
+	index = rdo_index(rdo);
+	if (!index || index > port->nr_src_pdo)
+		return -EINVAL;
+
+	pdo = port->src_pdo[index - 1];
+	type = pdo_type(pdo);
+	switch (type) {
+	case PDO_TYPE_FIXED:
+	case PDO_TYPE_VAR:
+		max = rdo_max_current(rdo);
+		op = rdo_op_current(rdo);
+		pdo_max = pdo_max_current(pdo);
+
+		if (op > pdo_max)
+			return -EINVAL;
+		if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
+			return -EINVAL;
+
+		if (type == PDO_TYPE_FIXED)
+			dev_dbg(dev, "TCPM: Requested %u mV, %u mA for %u / %u mA\n",
+				pdo_fixed_voltage(pdo), pdo_max, op, max);
+		else
+			dev_dbg(dev, "TCPM: Requested %u -> %u mV, %u mA for %u / %u mA\n",
+				pdo_min_voltage(pdo), pdo_max_voltage(pdo),
+				pdo_max, op, max);
+		break;
+	case PDO_TYPE_BATT:
+		max = rdo_max_power(rdo);
+		op = rdo_op_power(rdo);
+		pdo_max = pdo_max_power(pdo);
+
+		if (op > pdo_max)
+			return -EINVAL;
+		if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
+			return -EINVAL;
+		dev_info(dev, "TCPM: Requested %u -> %u mV, %u mW for %u / %u mW\n",
+			 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
+			 pdo_max, op, max);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+#define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
+#define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
+
+static int tcpm_pd_select_pdo(struct udevice *dev, int *sink_pdo,
+			      int *src_pdo)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
+		     max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
+		     min_snk_mv = 0;
+	int ret = -EINVAL;
+
+	/*
+	 * Select the source PDO providing the most power which has a
+	 * matchig sink cap.
+	 */
+	for (i = 0; i < port->nr_source_caps; i++) {
+		u32 pdo = port->source_caps[i];
+		enum pd_pdo_type type = pdo_type(pdo);
+
+		switch (type) {
+		case PDO_TYPE_FIXED:
+			max_src_mv = pdo_fixed_voltage(pdo);
+			min_src_mv = max_src_mv;
+			break;
+		case PDO_TYPE_BATT:
+		case PDO_TYPE_VAR:
+			max_src_mv = pdo_max_voltage(pdo);
+			min_src_mv = pdo_min_voltage(pdo);
+			break;
+		case PDO_TYPE_APDO:
+			continue;
+		default:
+			dev_err(dev, "TCPM: Invalid source PDO type, ignoring\n");
+			continue;
+		}
+
+		switch (type) {
+		case PDO_TYPE_FIXED:
+		case PDO_TYPE_VAR:
+			src_ma = pdo_max_current(pdo);
+			src_mw = src_ma * min_src_mv / 1000;
+			break;
+		case PDO_TYPE_BATT:
+			src_mw = pdo_max_power(pdo);
+			break;
+		case PDO_TYPE_APDO:
+			continue;
+		default:
+			dev_err(dev, "TCPM: Invalid source PDO type, ignoring\n");
+			continue;
+		}
+
+		for (j = 0; j < port->nr_snk_pdo; j++) {
+			pdo = port->snk_pdo[j];
+
+			switch (pdo_type(pdo)) {
+			case PDO_TYPE_FIXED:
+				max_snk_mv = pdo_fixed_voltage(pdo);
+				min_snk_mv = max_snk_mv;
+				break;
+			case PDO_TYPE_BATT:
+			case PDO_TYPE_VAR:
+				max_snk_mv = pdo_max_voltage(pdo);
+				min_snk_mv = pdo_min_voltage(pdo);
+				break;
+			case PDO_TYPE_APDO:
+				continue;
+			default:
+				dev_err(dev, "TCPM: Invalid sink PDO type, ignoring\n");
+				continue;
+			}
+
+			if (max_src_mv <= max_snk_mv && min_src_mv >= min_snk_mv) {
+				/* Prefer higher voltages if available */
+				if ((src_mw == max_mw && min_src_mv > max_mv) ||
+				    src_mw > max_mw) {
+					*src_pdo = i;
+					*sink_pdo = j;
+					max_mw = src_mw;
+					max_mv = min_src_mv;
+					ret = 0;
+				}
+			}
+		}
+	}
+
+	return ret;
+}
+
+static int tcpm_pd_build_request(struct udevice *dev, u32 *rdo)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	unsigned int mv, ma, mw, flags;
+	unsigned int max_ma, max_mw;
+	enum pd_pdo_type type;
+	u32 pdo, matching_snk_pdo;
+	int src_pdo_index = 0;
+	int snk_pdo_index = 0;
+	int ret;
+
+	ret = tcpm_pd_select_pdo(dev, &snk_pdo_index, &src_pdo_index);
+	if (ret < 0)
+		return ret;
+
+	pdo = port->source_caps[src_pdo_index];
+	matching_snk_pdo = port->snk_pdo[snk_pdo_index];
+	type = pdo_type(pdo);
+
+	switch (type) {
+	case PDO_TYPE_FIXED:
+		mv = pdo_fixed_voltage(pdo);
+		break;
+	case PDO_TYPE_BATT:
+	case PDO_TYPE_VAR:
+		mv = pdo_min_voltage(pdo);
+		break;
+	default:
+		dev_err(dev, "TCPM: Invalid PDO selected!\n");
+		return -EINVAL;
+	}
+
+	/* Select maximum available current within the sink pdo's limit */
+	if (type == PDO_TYPE_BATT) {
+		mw = min_power(pdo, matching_snk_pdo);
+		ma = 1000 * mw / mv;
+	} else {
+		ma = min_current(pdo, matching_snk_pdo);
+		mw = ma * mv / 1000;
+	}
+
+	flags = RDO_USB_COMM | RDO_NO_SUSPEND;
+
+	/* Set mismatch bit if offered power is less than operating power */
+	max_ma = ma;
+	max_mw = mw;
+	if (mw < port->operating_snk_mw) {
+		flags |= RDO_CAP_MISMATCH;
+		if (type == PDO_TYPE_BATT &&
+		    (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
+			max_mw = pdo_max_power(matching_snk_pdo);
+		else if (pdo_max_current(matching_snk_pdo) >
+			 pdo_max_current(pdo))
+			max_ma = pdo_max_current(matching_snk_pdo);
+	}
+
+	dev_dbg(dev, "TCPM: cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d\n",
+		port->cc_req, port->cc1, port->cc2, port->vbus_source,
+		port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
+		port->polarity);
+
+	if (type == PDO_TYPE_BATT) {
+		*rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
+
+		dev_info(dev, "TCPM: requesting PDO %d: %u mV, %u mW%s\n",
+			 src_pdo_index, mv, mw,
+			 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
+	} else {
+		*rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
+
+		dev_info(dev, "TCPM: requesting PDO %d: %u mV, %u mA%s\n",
+			 src_pdo_index, mv, ma,
+			 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
+	}
+
+	port->req_current_limit = ma;
+	port->req_supply_voltage = mv;
+
+	return 0;
+}
+
+static int tcpm_pd_send_request(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	struct pd_message msg;
+	int ret;
+	u32 rdo;
+
+	ret = tcpm_pd_build_request(dev, &rdo);
+	if (ret < 0)
+		return ret;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
+				  port->pwr_role,
+				  port->data_role,
+				  port->negotiated_rev,
+				  port->message_id, 1);
+	msg.payload[0] = cpu_to_le32(rdo);
+
+	return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg);
+}
+
+static int tcpm_set_vbus(struct udevice *dev, bool enable)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	int ret;
+
+	if (enable && port->vbus_charge)
+		return -EINVAL;
+
+	dev_dbg(dev, "TCPM: set vbus = %d charge = %d\n",
+		enable, port->vbus_charge);
+
+	ret = drvops->set_vbus(dev, enable, port->vbus_charge);
+	if (ret < 0)
+		return ret;
+
+	port->vbus_source = enable;
+	return 0;
+}
+
+static int tcpm_set_charge(struct udevice *dev, bool charge)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	int ret;
+
+	if (charge && port->vbus_source)
+		return -EINVAL;
+
+	if (charge != port->vbus_charge) {
+		dev_dbg(dev, "TCPM: set vbus = %d charge = %d\n",
+			port->vbus_source, charge);
+		ret = drvops->set_vbus(dev, port->vbus_source,
+					   charge);
+		if (ret < 0)
+			return ret;
+	}
+	port->vbus_charge = charge;
+	return 0;
+}
+
+static bool tcpm_start_toggling(struct udevice *dev, enum typec_cc_status cc)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	int ret;
+
+	if (!drvops->start_toggling)
+		return false;
+
+	dev_dbg(dev, "TCPM: Start toggling\n");
+	ret = drvops->start_toggling(dev, port->port_type, cc);
+	return ret == 0;
+}
+
+static int tcpm_init_vbus(struct udevice *dev)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	int ret;
+
+	ret = drvops->set_vbus(dev, false, false);
+	port->vbus_source = false;
+	port->vbus_charge = false;
+	return ret;
+}
+
+static int tcpm_init_vconn(struct udevice *dev)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	int ret;
+
+	ret = drvops->set_vconn(dev, false);
+	port->vconn_role = TYPEC_SINK;
+	return ret;
+}
+
+static inline void tcpm_typec_connect(struct tcpm_port *port)
+{
+	if (!port->connected)
+		port->connected = true;
+}
+
+static int tcpm_src_attach(struct udevice *dev)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	enum typec_cc_polarity polarity =
+				port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
+							 : TYPEC_POLARITY_CC1;
+	int ret;
+
+	if (port->attached)
+		return 0;
+
+	ret = tcpm_set_polarity(dev, polarity);
+	if (ret < 0)
+		return ret;
+
+	ret = tcpm_set_roles(dev, true, TYPEC_SOURCE, TYPEC_HOST);
+	if (ret < 0)
+		return ret;
+
+	ret = drvops->set_pd_rx(dev, true);
+	if (ret < 0)
+		goto out_disable_mux;
+
+	/*
+	 * USB Type-C specification, version 1.2,
+	 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
+	 * Enable VCONN only if the non-RD port is set to RA.
+	 */
+	if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
+	    (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
+		ret = tcpm_set_vconn(dev, true);
+		if (ret < 0)
+			goto out_disable_pd;
+	}
+
+	ret = tcpm_set_vbus(dev, true);
+	if (ret < 0)
+		goto out_disable_vconn;
+
+	port->pd_capable = false;
+
+	port->partner = NULL;
+
+	port->attached = true;
+
+	return 0;
+
+out_disable_vconn:
+	tcpm_set_vconn(dev, false);
+out_disable_pd:
+	drvops->set_pd_rx(dev, false);
+out_disable_mux:
+	dev_err(dev, "TCPM: CC connected in %s as DFP\n",
+		polarity ? "CC2" : "CC1");
+	return 0;
+}
+
+static inline void tcpm_typec_disconnect(struct tcpm_port *port)
+{
+	if (port->connected) {
+		port->partner = NULL;
+		port->connected = false;
+	}
+}
+
+static void tcpm_reset_port(struct udevice *dev)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	tcpm_timer_uninit(dev);
+	tcpm_typec_disconnect(port);
+	tcpm_reset_event_cnt(dev);
+	port->wait_dr_swap_message = false;
+	port->attached = false;
+	port->pd_capable = false;
+
+	/*
+	 * First Rx ID should be 0; set this to a sentinel of -1 so that
+	 * we can check tcpm_pd_rx_handler() if we had seen it before.
+	 */
+	port->rx_msgid = -1;
+
+	drvops->set_pd_rx(dev, false);
+	tcpm_init_vbus(dev);	/* also disables charging */
+	tcpm_init_vconn(dev);
+	tcpm_set_current_limit(dev, 0, 0);
+	tcpm_set_polarity(dev, TYPEC_POLARITY_CC1);
+	tcpm_set_attached_state(dev, false);
+	port->nr_sink_caps = 0;
+}
+
+static void tcpm_detach(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	if (tcpm_port_is_disconnected(port))
+		port->hard_reset_count = 0;
+
+	if (!port->attached)
+		return;
+
+	tcpm_reset_port(dev);
+}
+
+static void tcpm_src_detach(struct udevice *dev)
+{
+	tcpm_detach(dev);
+}
+
+static int tcpm_snk_attach(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	int ret;
+
+	if (port->attached)
+		return 0;
+
+	ret = tcpm_set_polarity(dev, port->cc2 != TYPEC_CC_OPEN ?
+				TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
+	if (ret < 0)
+		return ret;
+
+	ret = tcpm_set_roles(dev, true, TYPEC_SINK, TYPEC_DEVICE);
+	if (ret < 0)
+		return ret;
+
+	port->pd_capable = false;
+
+	port->partner = NULL;
+
+	port->attached = true;
+	dev_info(dev, "TCPM: CC connected in %s as UFP\n",
+		 port->cc1 != TYPEC_CC_OPEN ? "CC1" : "CC2");
+
+	return 0;
+}
+
+static void tcpm_snk_detach(struct udevice *dev)
+{
+	tcpm_detach(dev);
+}
+
+static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
+{
+	if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
+		return HARD_RESET_SEND;
+	if (port->pd_capable)
+		return ERROR_RECOVERY;
+	if (port->pwr_role == TYPEC_SOURCE)
+		return SRC_UNATTACHED;
+	if (port->state == SNK_WAIT_CAPABILITIES)
+		return SNK_READY;
+	return SNK_UNATTACHED;
+}
+
+static inline enum tcpm_state unattached_state(struct tcpm_port *port)
+{
+	if (port->port_type == TYPEC_PORT_DRP) {
+		if (port->pwr_role == TYPEC_SOURCE)
+			return SRC_UNATTACHED;
+		else
+			return SNK_UNATTACHED;
+	} else if (port->port_type == TYPEC_PORT_SRC) {
+		return SRC_UNATTACHED;
+	}
+
+	return SNK_UNATTACHED;
+}
+
+static void run_state_machine(struct udevice *dev)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	int ret;
+
+	port->enter_state = port->state;
+	switch (port->state) {
+	case TOGGLING:
+		break;
+	/* SRC states */
+	case SRC_UNATTACHED:
+		tcpm_src_detach(dev);
+		if (tcpm_start_toggling(dev, tcpm_rp_cc(port))) {
+			tcpm_set_state(dev, TOGGLING, 0);
+			break;
+		}
+		tcpm_set_cc(dev, tcpm_rp_cc(port));
+		if (port->port_type == TYPEC_PORT_DRP)
+			tcpm_set_state(dev, SNK_UNATTACHED, PD_T_DRP_SNK);
+		break;
+	case SRC_ATTACH_WAIT:
+		if (tcpm_port_is_source(port))
+			tcpm_set_state(dev, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
+		break;
+
+	case SRC_ATTACHED:
+		ret = tcpm_src_attach(dev);
+		/*
+		 * Currently, vbus control is not implemented,
+		 * and the SRC detection process cannot be fully implemented.
+		 */
+		tcpm_set_state(dev, SRC_READY, 0);
+		break;
+	case SRC_STARTUP:
+		port->caps_count = 0;
+		port->negotiated_rev = PD_MAX_REV;
+		port->message_id = 0;
+		port->rx_msgid = -1;
+		port->explicit_contract = false;
+		tcpm_set_state(dev, SRC_SEND_CAPABILITIES, 0);
+		break;
+	case SRC_SEND_CAPABILITIES:
+		port->caps_count++;
+		if (port->caps_count > PD_N_CAPS_COUNT) {
+			tcpm_set_state(dev, SRC_READY, 0);
+			break;
+		}
+		ret = tcpm_pd_send_source_caps(dev);
+		if (ret < 0) {
+			tcpm_set_state(dev, SRC_SEND_CAPABILITIES,
+				       PD_T_SEND_SOURCE_CAP);
+		} else {
+			/*
+			 * Per standard, we should clear the reset counter here.
+			 * However, that can result in state machine hang-ups.
+			 * Reset it only in READY state to improve stability.
+			 */
+			/* port->hard_reset_count = 0; */
+			port->caps_count = 0;
+			port->pd_capable = true;
+			tcpm_set_state_cond(dev, SRC_SEND_CAPABILITIES_TIMEOUT,
+					    PD_T_SEND_SOURCE_CAP);
+		}
+		break;
+	case SRC_SEND_CAPABILITIES_TIMEOUT:
+		/*
+		 * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
+		 *
+		 * PD 2.0 sinks are supposed to accept src-capabilities with a
+		 * 3.0 header and simply ignore any src PDOs which the sink does
+		 * not understand such as PPS but some 2.0 sinks instead ignore
+		 * the entire PD_DATA_SOURCE_CAP message, causing contract
+		 * negotiation to fail.
+		 *
+		 * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
+		 * sending src-capabilities with a lower PD revision to
+		 * make these broken sinks work.
+		 */
+		if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
+			tcpm_set_state(dev, HARD_RESET_SEND, 0);
+		} else if (port->negotiated_rev > PD_REV20) {
+			port->negotiated_rev--;
+			port->hard_reset_count = 0;
+			tcpm_set_state(dev, SRC_SEND_CAPABILITIES, 0);
+		} else {
+			tcpm_set_state(dev, hard_reset_state(port), 0);
+		}
+		break;
+	case SRC_NEGOTIATE_CAPABILITIES:
+		ret = tcpm_pd_check_request(dev);
+		if (ret < 0) {
+			tcpm_pd_send_control(dev, PD_CTRL_REJECT);
+			if (!port->explicit_contract) {
+				tcpm_set_state(dev,
+					       SRC_WAIT_NEW_CAPABILITIES, 0);
+			} else {
+				tcpm_set_state(dev, SRC_READY, 0);
+			}
+		} else {
+			tcpm_pd_send_control(dev, PD_CTRL_ACCEPT);
+			tcpm_set_state(dev, SRC_TRANSITION_SUPPLY,
+				       PD_T_SRC_TRANSITION);
+		}
+		break;
+	case SRC_TRANSITION_SUPPLY:
+		/* XXX: regulator_set_voltage(vbus, ...) */
+		tcpm_pd_send_control(dev, PD_CTRL_PS_RDY);
+		port->explicit_contract = true;
+		tcpm_set_state_cond(dev, SRC_READY, 0);
+		break;
+	case SRC_READY:
+		port->hard_reset_count = 0;
+
+		tcpm_typec_connect(port);
+		break;
+	case SRC_WAIT_NEW_CAPABILITIES:
+		/* Nothing to do... */
+		break;
+
+	/* SNK states */
+	case SNK_UNATTACHED:
+		tcpm_snk_detach(dev);
+		if (tcpm_start_toggling(dev, TYPEC_CC_RD)) {
+			tcpm_set_state(dev, TOGGLING, 0);
+			break;
+		}
+		tcpm_set_cc(dev, TYPEC_CC_RD);
+		if (port->port_type == TYPEC_PORT_DRP)
+			tcpm_set_state(dev, SRC_UNATTACHED, PD_T_DRP_SRC);
+		break;
+	case SNK_ATTACH_WAIT:
+		if ((port->cc1 == TYPEC_CC_OPEN &&
+		     port->cc2 != TYPEC_CC_OPEN) ||
+		    (port->cc1 != TYPEC_CC_OPEN &&
+		     port->cc2 == TYPEC_CC_OPEN))
+			tcpm_set_state(dev, SNK_DEBOUNCED,
+				       PD_T_CC_DEBOUNCE);
+		else if (tcpm_port_is_disconnected(port))
+			tcpm_set_state(dev, SNK_UNATTACHED,
+				       PD_T_CC_DEBOUNCE);
+		break;
+	case SNK_DEBOUNCED:
+		if (tcpm_port_is_disconnected(port))
+			tcpm_set_state(dev, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
+		else if (port->vbus_present)
+			tcpm_set_state(dev, SNK_ATTACHED, 0);
+		else
+			/* Wait for VBUS, but not forever */
+			tcpm_set_state(dev, PORT_RESET, PD_T_PS_SOURCE_ON);
+		break;
+	case SNK_ATTACHED:
+		ret = tcpm_snk_attach(dev);
+		if (ret < 0)
+			tcpm_set_state(dev, SNK_UNATTACHED, 0);
+		else
+			tcpm_set_state(dev, SNK_STARTUP, 0);
+		break;
+	case SNK_STARTUP:
+		port->negotiated_rev = PD_MAX_REV;
+		port->message_id = 0;
+		port->rx_msgid = -1;
+		port->explicit_contract = false;
+		tcpm_set_state(dev, SNK_DISCOVERY, 0);
+		break;
+	case SNK_DISCOVERY:
+		if (port->vbus_present) {
+			tcpm_set_current_limit(dev,
+					       tcpm_get_current_limit(port),
+					       5000);
+			tcpm_set_charge(dev, true);
+			tcpm_set_state(dev, SNK_WAIT_CAPABILITIES, 0);
+			break;
+		}
+		/*
+		 * For DRP, timeouts differ. Also, handling is supposed to be
+		 * different and much more complex (dead battery detection;
+		 * see USB power delivery specification, section 8.3.3.6.1.5.1).
+		 */
+		tcpm_set_state(dev, hard_reset_state(port),
+			       port->port_type == TYPEC_PORT_DRP ?
+					PD_T_DB_DETECT : PD_T_NO_RESPONSE);
+		break;
+	case SNK_DISCOVERY_DEBOUNCE:
+		tcpm_set_state(dev, SNK_DISCOVERY_DEBOUNCE_DONE,
+			       PD_T_CC_DEBOUNCE);
+		break;
+	case SNK_DISCOVERY_DEBOUNCE_DONE:
+		tcpm_set_state(dev, unattached_state(port), 0);
+		break;
+	case SNK_WAIT_CAPABILITIES:
+		ret = drvops->set_pd_rx(dev, true);
+		if (ret < 0) {
+			tcpm_set_state(dev, SNK_READY, 0);
+			break;
+		}
+		/*
+		 * If VBUS has never been low, and we time out waiting
+		 * for source cap, try a soft reset first, in case we
+		 * were already in a stable contract before this boot.
+		 * Do this only once.
+		 */
+		if (port->vbus_never_low) {
+			port->vbus_never_low = false;
+			tcpm_set_state(dev, SOFT_RESET_SEND,
+				       PD_T_SINK_WAIT_CAP);
+		} else {
+			tcpm_set_state(dev, hard_reset_state(port),
+				       PD_T_SINK_WAIT_CAP);
+		}
+		break;
+	case SNK_NEGOTIATE_CAPABILITIES:
+		port->pd_capable = true;
+		port->hard_reset_count = 0;
+		ret = tcpm_pd_send_request(dev);
+		if (ret < 0) {
+			/* Let the Source send capabilities again. */
+			tcpm_set_state(dev, SNK_WAIT_CAPABILITIES, 0);
+		} else {
+			tcpm_set_state_cond(dev, hard_reset_state(port),
+					    PD_T_SENDER_RESPONSE);
+		}
+		break;
+	case SNK_TRANSITION_SINK:
+	case SNK_TRANSITION_SINK_VBUS:
+		tcpm_set_state(dev, hard_reset_state(port),
+			       PD_T_PS_TRANSITION);
+		break;
+	case SNK_READY:
+		port->update_sink_caps = false;
+		tcpm_typec_connect(port);
+		/*
+		 * Here poll_event_cnt is cleared, waiting for self-powered Type-C devices
+		 * to send DR_swap Messge until 1s (TCPM_POLL_EVENT_TIME_OUT * 500us)timeout
+		 */
+		if (port->wait_dr_swap_message)
+			tcpm_reset_event_cnt(dev);
+
+		break;
+
+	/* Hard_Reset states */
+	case HARD_RESET_SEND:
+		tcpm_pd_transmit(dev, TCPC_TX_HARD_RESET, NULL);
+		tcpm_set_state(dev, HARD_RESET_START, 0);
+		port->wait_dr_swap_message = false;
+		break;
+	case HARD_RESET_START:
+		port->hard_reset_count++;
+		drvops->set_pd_rx(dev, false);
+		port->nr_sink_caps = 0;
+		if (port->pwr_role == TYPEC_SOURCE)
+			tcpm_set_state(dev, SRC_HARD_RESET_VBUS_OFF,
+				       PD_T_PS_HARD_RESET);
+		else
+			tcpm_set_state(dev, SNK_HARD_RESET_SINK_OFF, 0);
+		break;
+	case SRC_HARD_RESET_VBUS_OFF:
+		tcpm_set_vconn(dev, true);
+		tcpm_set_vbus(dev, false);
+		tcpm_set_roles(dev, port->self_powered, TYPEC_SOURCE,
+			       TYPEC_HOST);
+		tcpm_set_state(dev, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
+		break;
+	case SRC_HARD_RESET_VBUS_ON:
+		tcpm_set_vconn(dev, true);
+		tcpm_set_vbus(dev, true);
+		drvops->set_pd_rx(dev, true);
+		tcpm_set_attached_state(dev, true);
+		tcpm_set_state(dev, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
+		break;
+	case SNK_HARD_RESET_SINK_OFF:
+		tcpm_set_vconn(dev, false);
+		if (port->pd_capable)
+			tcpm_set_charge(dev, false);
+		tcpm_set_roles(dev, port->self_powered, TYPEC_SINK,
+			       TYPEC_DEVICE);
+		/*
+		 * VBUS may or may not toggle, depending on the adapter.
+		 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
+		 * directly after timeout.
+		 */
+		tcpm_set_state(dev, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
+		break;
+	case SNK_HARD_RESET_WAIT_VBUS:
+		/* Assume we're disconnected if VBUS doesn't come back. */
+		tcpm_set_state(dev, SNK_UNATTACHED,
+			       PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
+		break;
+	case SNK_HARD_RESET_SINK_ON:
+		/* Note: There is no guarantee that VBUS is on in this state */
+		/*
+		 * XXX:
+		 * The specification suggests that dual mode ports in sink
+		 * mode should transition to state PE_SRC_Transition_to_default.
+		 * See USB power delivery specification chapter 8.3.3.6.1.3.
+		 * This would mean to
+		 * - turn off VCONN, reset power supply
+		 * - request hardware reset
+		 * - turn on VCONN
+		 * - Transition to state PE_Src_Startup
+		 * SNK only ports shall transition to state Snk_Startup
+		 * (see chapter 8.3.3.3.8).
+		 * Similar, dual-mode ports in source mode should transition
+		 * to PE_SNK_Transition_to_default.
+		 */
+		if (port->pd_capable) {
+			tcpm_set_current_limit(dev,
+					       tcpm_get_current_limit(port),
+					       5000);
+			tcpm_set_charge(dev, true);
+		}
+		tcpm_set_attached_state(dev, true);
+		tcpm_set_state(dev, SNK_STARTUP, 0);
+		break;
+
+	/* Soft_Reset states */
+	case SOFT_RESET:
+		port->message_id = 0;
+		port->rx_msgid = -1;
+		tcpm_pd_send_control(dev, PD_CTRL_ACCEPT);
+		if (port->pwr_role == TYPEC_SOURCE)
+			tcpm_set_state(dev, SRC_SEND_CAPABILITIES, 0);
+		else
+			tcpm_set_state(dev, SNK_WAIT_CAPABILITIES, 0);
+		break;
+	case SOFT_RESET_SEND:
+		port->message_id = 0;
+		port->rx_msgid = -1;
+		if (tcpm_pd_send_control(dev, PD_CTRL_SOFT_RESET))
+			tcpm_set_state_cond(dev, hard_reset_state(port), 0);
+		else
+			tcpm_set_state_cond(dev, hard_reset_state(port),
+					    PD_T_SENDER_RESPONSE);
+		break;
+
+	/* DR_Swap states */
+	case DR_SWAP_ACCEPT:
+		tcpm_pd_send_control(dev, PD_CTRL_ACCEPT);
+		tcpm_set_state_cond(dev, DR_SWAP_CHANGE_DR, 0);
+		break;
+	case DR_SWAP_CHANGE_DR:
+		if (port->data_role == TYPEC_HOST) {
+			tcpm_set_roles(dev, true, port->pwr_role,
+				       TYPEC_DEVICE);
+		} else {
+			tcpm_set_roles(dev, true, port->pwr_role,
+				       TYPEC_HOST);
+		}
+		/* DR_swap process complete, wait_dr_swap_message is cleared */
+		port->wait_dr_swap_message = false;
+		tcpm_set_state(dev, ready_state(port), 0);
+		break;
+	case ERROR_RECOVERY:
+		tcpm_set_state(dev, PORT_RESET, 0);
+		break;
+	case PORT_RESET:
+		tcpm_reset_port(dev);
+		if (port->self_powered)
+			tcpm_set_cc(dev, TYPEC_CC_OPEN);
+		else
+			tcpm_set_cc(dev, tcpm_default_state(port) == SNK_UNATTACHED ?
+				    TYPEC_CC_RD : tcpm_rp_cc(port));
+		tcpm_set_state(dev, PORT_RESET_WAIT_OFF,
+			       PD_T_ERROR_RECOVERY);
+		break;
+	case PORT_RESET_WAIT_OFF:
+		tcpm_set_state(dev,
+			       tcpm_default_state(port),
+			       port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
+		break;
+	default:
+		dev_err(dev, "TCPM: Unexpected port state %d\n", port->state);
+		break;
+	}
+}
+
+static void tcpm_state_machine(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	enum tcpm_state prev_state;
+
+	mutex_lock(&port->lock);
+	port->state_machine_running = true;
+
+	if (port->queued_message && tcpm_send_queued_message(dev))
+		goto done;
+
+	/* If we were queued due to a delayed state change, update it now */
+	if (port->delayed_state) {
+		dev_dbg(dev, "TCPM: state change %s -> %s [delayed %ld ms]\n",
+			tcpm_states[port->state],
+			tcpm_states[port->delayed_state], port->delay_ms);
+		port->prev_state = port->state;
+		port->state = port->delayed_state;
+		port->delayed_state = INVALID_STATE;
+	}
+
+	/*
+	 * Continue running as long as we have (non-delayed) state changes
+	 * to make.
+	 */
+	do {
+		prev_state = port->state;
+		run_state_machine(dev);
+		if (port->queued_message)
+			tcpm_send_queued_message(dev);
+	} while (port->state != prev_state && !port->delayed_state);
+
+done:
+	port->state_machine_running = false;
+	mutex_unlock(&port->lock);
+}
+
+static void _tcpm_cc_change(struct udevice *dev, enum typec_cc_status cc1,
+			    enum typec_cc_status cc2)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	enum typec_cc_status old_cc1, old_cc2;
+	enum tcpm_state new_state;
+
+	old_cc1 = port->cc1;
+	old_cc2 = port->cc2;
+	port->cc1 = cc1;
+	port->cc2 = cc2;
+
+	dev_dbg(dev, "TCPM: CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]\n",
+		old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
+		port->polarity,
+		tcpm_port_is_disconnected(port) ? "disconnected" : "connected");
+
+	switch (port->state) {
+	case TOGGLING:
+		if (tcpm_port_is_source(port))
+			tcpm_set_state(dev, SRC_ATTACH_WAIT, 0);
+		else if (tcpm_port_is_sink(port))
+			tcpm_set_state(dev, SNK_ATTACH_WAIT, 0);
+		break;
+	case SRC_UNATTACHED:
+	case SRC_ATTACH_WAIT:
+		if (tcpm_port_is_disconnected(port))
+			tcpm_set_state(dev, SRC_UNATTACHED, 0);
+		else if (cc1 != old_cc1 || cc2 != old_cc2)
+			tcpm_set_state(dev, SRC_ATTACH_WAIT, 0);
+		break;
+	case SRC_ATTACHED:
+	case SRC_SEND_CAPABILITIES:
+	case SRC_READY:
+		if (tcpm_port_is_disconnected(port) ||
+		    !tcpm_port_is_source(port))
+			tcpm_set_state(dev, SRC_UNATTACHED, 0);
+		break;
+	case SNK_UNATTACHED:
+		if (tcpm_port_is_sink(port))
+			tcpm_set_state(dev, SNK_ATTACH_WAIT, 0);
+		break;
+	case SNK_ATTACH_WAIT:
+		if ((port->cc1 == TYPEC_CC_OPEN &&
+		     port->cc2 != TYPEC_CC_OPEN) ||
+		    (port->cc1 != TYPEC_CC_OPEN &&
+		     port->cc2 == TYPEC_CC_OPEN))
+			new_state = SNK_DEBOUNCED;
+		else if (tcpm_port_is_disconnected(port))
+			new_state = SNK_UNATTACHED;
+		else
+			break;
+		if (new_state != port->delayed_state)
+			tcpm_set_state(dev, SNK_ATTACH_WAIT, 0);
+		break;
+	case SNK_DEBOUNCED:
+		if (tcpm_port_is_disconnected(port))
+			new_state = SNK_UNATTACHED;
+		else if (port->vbus_present)
+			new_state = tcpm_try_src(port) ? INVALID_STATE : SNK_ATTACHED;
+		else
+			new_state = SNK_UNATTACHED;
+		if (new_state != port->delayed_state)
+			tcpm_set_state(dev, SNK_DEBOUNCED, 0);
+		break;
+	case SNK_READY:
+		if (tcpm_port_is_disconnected(port))
+			tcpm_set_state(dev, unattached_state(port), 0);
+		else if (!port->pd_capable &&
+			 (cc1 != old_cc1 || cc2 != old_cc2))
+			tcpm_set_current_limit(dev,
+					       tcpm_get_current_limit(port),
+					       5000);
+		break;
+
+	case SNK_DISCOVERY:
+		/* CC line is unstable, wait for debounce */
+		if (tcpm_port_is_disconnected(port))
+			tcpm_set_state(dev, SNK_DISCOVERY_DEBOUNCE, 0);
+		break;
+	case SNK_DISCOVERY_DEBOUNCE:
+		break;
+
+	case PORT_RESET:
+	case PORT_RESET_WAIT_OFF:
+		/*
+		 * State set back to default mode once the timer completes.
+		 * Ignore CC changes here.
+		 */
+		break;
+	default:
+		/*
+		 * While acting as sink and auto vbus discharge is enabled, Allow disconnect
+		 * to be driven by vbus disconnect.
+		 */
+		if (tcpm_port_is_disconnected(port))
+			tcpm_set_state(dev, unattached_state(port), 0);
+		break;
+	}
+}
+
+static void _tcpm_pd_vbus_on(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	dev_dbg(dev, "TCPM: VBUS on event\n");
+	port->vbus_present = true;
+	/*
+	 * When vbus_present is true i.e. Voltage at VBUS is greater than VSAFE5V implicitly
+	 * states that vbus is not at VSAFE0V, hence clear the vbus_vsafe0v flag here.
+	 */
+	port->vbus_vsafe0v = false;
+
+	switch (port->state) {
+	case SNK_TRANSITION_SINK_VBUS:
+		port->explicit_contract = true;
+		tcpm_set_state(dev, SNK_READY, 0);
+		break;
+	case SNK_DISCOVERY:
+		tcpm_set_state(dev, SNK_DISCOVERY, 0);
+		break;
+	case SNK_DEBOUNCED:
+		tcpm_set_state(dev, SNK_ATTACHED, 0);
+		break;
+	case SNK_HARD_RESET_WAIT_VBUS:
+		tcpm_set_state(dev, SNK_HARD_RESET_SINK_ON, 0);
+		break;
+	case SRC_ATTACHED:
+		tcpm_set_state(dev, SRC_STARTUP, 0);
+		break;
+	case SRC_HARD_RESET_VBUS_ON:
+		tcpm_set_state(dev, SRC_STARTUP, 0);
+		break;
+
+	case PORT_RESET:
+	case PORT_RESET_WAIT_OFF:
+		/*
+		 * State set back to default mode once the timer completes.
+		 * Ignore vbus changes here.
+		 */
+		break;
+
+	default:
+		break;
+	}
+}
+
+static void _tcpm_pd_vbus_off(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	dev_dbg(dev, "TCPM: VBUS off event\n");
+	port->vbus_present = false;
+	port->vbus_never_low = false;
+	switch (port->state) {
+	case SNK_HARD_RESET_SINK_OFF:
+		tcpm_set_state(dev, SNK_HARD_RESET_WAIT_VBUS, 0);
+		break;
+	case HARD_RESET_SEND:
+		break;
+	case SNK_ATTACH_WAIT:
+		tcpm_set_state(dev, SNK_UNATTACHED, 0);
+		break;
+
+	case SNK_NEGOTIATE_CAPABILITIES:
+		break;
+
+	case PORT_RESET_WAIT_OFF:
+		tcpm_set_state(dev, tcpm_default_state(port), 0);
+		break;
+
+	case PORT_RESET:
+		/*
+		 * State set back to default mode once the timer completes.
+		 * Ignore vbus changes here.
+		 */
+		break;
+
+	default:
+		if (port->pwr_role == TYPEC_SINK && port->attached)
+			tcpm_set_state(dev, SNK_UNATTACHED, 0);
+		break;
+	}
+}
+
+void tcpm_cc_change(struct udevice *dev)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	enum typec_cc_status cc1, cc2;
+
+	tcpm_reset_event_cnt(dev);
+	if (drvops->get_cc(dev, &cc1, &cc2) == 0)
+		_tcpm_cc_change(dev, cc1, cc2);
+}
+
+void tcpm_vbus_change(struct udevice *dev)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	bool vbus;
+
+	tcpm_reset_event_cnt(dev);
+	vbus = drvops->get_vbus(dev);
+	if (vbus)
+		_tcpm_pd_vbus_on(dev);
+	else
+		_tcpm_pd_vbus_off(dev);
+}
+
+void tcpm_pd_hard_reset(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	tcpm_reset_event_cnt(dev);
+	dev_dbg(dev, "TCPM: Received hard reset\n");
+
+	/* If a hard reset message is received during the port reset process,
+	 * we should ignore it, that is, do not set port->state to HARD_RESET_START.
+	 */
+	if (port->state == PORT_RESET || port->state == PORT_RESET_WAIT_OFF)
+		return;
+
+	/*
+	 * If we keep receiving hard reset requests, executing the hard reset
+	 * must have failed. Revert to error recovery if that happens.
+	 */
+	tcpm_set_state(dev,
+		       port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
+				HARD_RESET_START : ERROR_RECOVERY,
+		       0);
+}
+
+static void tcpm_init(struct udevice *dev)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	enum typec_cc_status cc1, cc2;
+
+	drvops->init(dev);
+
+	tcpm_reset_port(dev);
+
+	/*
+	 * XXX
+	 * Should possibly wait for VBUS to settle if it was enabled locally
+	 * since tcpm_reset_port() will disable VBUS.
+	 */
+	port->vbus_present = drvops->get_vbus(dev);
+	if (port->vbus_present)
+		port->vbus_never_low = true;
+
+	/*
+	 * 1. When vbus_present is true, voltage on VBUS is already at VSAFE5V.
+	 * So implicitly vbus_vsafe0v = false.
+	 *
+	 * 2. When vbus_present is false and TCPC does NOT support querying
+	 * vsafe0v status, then, it's best to assume vbus is at VSAFE0V i.e.
+	 * vbus_vsafe0v is true.
+	 *
+	 * 3. When vbus_present is false and TCPC does support querying vsafe0v,
+	 * then, query tcpc for vsafe0v status.
+	 */
+	if (port->vbus_present)
+		port->vbus_vsafe0v = false;
+	else
+		port->vbus_vsafe0v = true;
+
+	tcpm_set_state(dev, tcpm_default_state(port), 0);
+
+	if (drvops->get_cc(dev, &cc1, &cc2) == 0)
+		_tcpm_cc_change(dev, cc1, cc2);
+}
+
+static int tcpm_fw_get_caps(struct udevice *dev)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	ofnode node;
+	const char *cap_str;
+	int ret;
+	u32 mw;
+
+	ret = drvops->get_connector_node(dev, &node);
+	if (ret)
+		return ret;
+
+	cap_str = ofnode_read_string(node, "power-role");
+	if (!cap_str)
+		return -EINVAL;
+
+	if (!strcmp("dual", cap_str))
+		port->typec_type = TYPEC_PORT_DRP;
+	else if (!strcmp("source", cap_str))
+		port->typec_type = TYPEC_PORT_SRC;
+	else if (!strcmp("sink", cap_str))
+		port->typec_type = TYPEC_PORT_SNK;
+	else
+		return -EINVAL;
+
+	port->port_type = port->typec_type;
+
+	if (port->port_type == TYPEC_PORT_SNK)
+		goto sink;
+
+	/* Get source pdos */
+	ret = ofnode_read_size(node, "source-pdos") / sizeof(u32);
+	if (ret <= 0)
+		return -EINVAL;
+
+	port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
+	ret = ofnode_read_u32_array(node, "source-pdos",
+				    port->src_pdo, port->nr_src_pdo);
+	if (ret || tcpm_validate_caps(dev, port->src_pdo, port->nr_src_pdo))
+		return -EINVAL;
+
+	if (port->port_type == TYPEC_PORT_SRC)
+		return 0;
+
+	/* Get the preferred power role for DRP */
+	cap_str = ofnode_read_string(node, "try-power-role");
+	if (!cap_str)
+		return -EINVAL;
+
+	if (!strcmp("sink", cap_str))
+		port->typec_prefer_role = TYPEC_SINK;
+	else if (!strcmp("source", cap_str))
+		port->typec_prefer_role = TYPEC_SOURCE;
+	else
+		return -EINVAL;
+
+	if (port->typec_prefer_role < 0)
+		return -EINVAL;
+sink:
+	/* Get sink pdos */
+	ret = ofnode_read_size(node, "sink-pdos") / sizeof(u32);
+	if (ret <= 0)
+		return -EINVAL;
+
+	port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
+	ret = ofnode_read_u32_array(node, "sink-pdos",
+				    port->snk_pdo, port->nr_snk_pdo);
+	if (ret || tcpm_validate_caps(dev, port->snk_pdo, port->nr_snk_pdo))
+		return -EINVAL;
+
+	if (ofnode_read_u32_array(node, "op-sink-microwatt", &mw, 1))
+		return -EINVAL;
+	port->operating_snk_mw = mw / 1000;
+
+	port->self_powered = ofnode_read_bool(node, "self-powered");
+
+	return 0;
+}
+
+static int tcpm_port_init(struct udevice *dev)
+{
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+	int err;
+
+	err = tcpm_fw_get_caps(dev);
+	if (err < 0) {
+		dev_err(dev, "TCPM: please check the dts config: %d\n", err);
+		return err;
+	}
+
+	port->try_role = port->typec_prefer_role;
+	port->port_type = port->typec_type;
+
+	tcpm_init(dev);
+
+	dev_info(dev, "TCPM: init finished\n");
+
+	return 0;
+}
+
+static void tcpm_poll_event(struct udevice *dev)
+{
+	const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
+	struct tcpm_port *port = dev_get_uclass_plat(dev);
+
+	if (!drvops->get_vbus(dev))
+		return;
+
+	while (port->poll_event_cnt < TCPM_POLL_EVENT_TIME_OUT) {
+		if (!port->wait_dr_swap_message &&
+		    (port->state == SNK_READY || port->state == SRC_READY))
+			break;
+
+		drvops->poll_event(dev);
+		port->poll_event_cnt++;
+		udelay(500);
+		tcpm_check_and_run_delayed_work(dev);
+	}
+
+	if (port->state != SNK_READY && port->state != SRC_READY)
+		dev_warn(dev, "TCPM: exit in state %s\n",
+			 tcpm_states[port->state]);
+
+	/*
+	 * At this time, call the callback function of the respective pd chip
+	 * to enter the low-power mode. In order to reduce the time spent on
+	 * the PD chip driver as much as possible, the tcpm framework does not
+	 * fully process the communication initiated by the device,so it should
+	 * be noted that we can disable the internal oscillator, etc., but do
+	 * not turn off the power of the transceiver module, otherwise the
+	 * self-powered Type-C device will initiate a Message(eg: self-powered
+	 * Type-C hub initiates a SINK capability request(PD_CTRL_GET_SINK_CAP))
+	 * and the pd chip cannot reply to GoodCRC, causing the self-powered Type-C
+	 * device to switch vbus to vSafe5v, or even turn off vbus.
+	 */
+	if (!drvops->enter_low_power_mode)
+		return;
+
+	if (drvops->enter_low_power_mode(dev, port->attached, port->pd_capable))
+		dev_err(dev, "TCPM: failed to enter low power\n");
+	else
+		dev_info(dev, "TCPM: PD chip enter low power mode\n");
+}
+
+int tcpm_post_probe(struct udevice *dev)
+{
+	int ret = tcpm_port_init(dev);
+
+	if (ret < 0) {
+		dev_err(dev, "failed to tcpm port init\n");
+		return ret;
+	}
+
+	tcpm_poll_event(dev);
+
+	return 0;
+}