drivers/spmi/spmi-msm.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: BSD-3-Clause
 /*
  * Qualcomm SPMI bus driver
  *
  * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
  *
  * Loosely based on Little Kernel driver
  */

 #include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>
 #include <asm/global_data.h>
 #include <asm/io.h>
 #include <dm/device_compat.h>
 #include <spmi/spmi.h>

 DECLARE_GLOBAL_DATA_PTR;

 /* PMIC Arbiter configuration registers */
 #define PMIC_ARB_VERSION 0x0000
 #define PMIC_ARB_VERSION_V2_MIN 0x20010000
 #define PMIC_ARB_VERSION_V3_MIN 0x30000000
 #define PMIC_ARB_VERSION_V5_MIN 0x50000000
 #define PMIC_ARB_VERSION_V7_MIN	0x70000000

 #define APID_MAP_OFFSET_V1_V2_V3 (0x800)
 #define APID_MAP_OFFSET_V5 (0x900)
 #define APID_MAP_OFFSET_V7 (0x2000)
 #define ARB_CHANNEL_OFFSET(n) (0x4 * (n))
 #define SPMI_CH_OFFSET(chnl) ((chnl) * 0x8000)
 #define SPMI_V5_OBS_CH_OFFSET(chnl) ((chnl) * 0x80)
 #define SPMI_V7_OBS_CH_OFFSET(chnl) ((chnl) * 0x20)
 #define SPMI_V5_RW_CH_OFFSET(chnl) ((chnl) * 0x10000)
 #define SPMI_V7_RW_CH_OFFSET(chnl) ((chnl) * 0x1000)

 #define SPMI_OWNERSHIP_PERIPH2OWNER(x)	((x) & 0x7)

 #define SPMI_REG_CMD0 0x0
 #define SPMI_REG_CONFIG 0x4
 #define SPMI_REG_STATUS 0x8
 #define SPMI_REG_WDATA 0x10
 #define SPMI_REG_RDATA 0x18

 #define SPMI_CMD_OPCODE_SHIFT 27
 #define SPMI_CMD_SLAVE_ID_SHIFT 20
 #define SPMI_CMD_ADDR_SHIFT 12
 #define SPMI_CMD_ADDR_OFFSET_SHIFT 4
 #define SPMI_CMD_BYTE_CNT_SHIFT 0

 #define SPMI_CMD_EXT_REG_WRITE_LONG 0x00
 #define SPMI_CMD_EXT_REG_READ_LONG 0x01

 #define SPMI_STATUS_DONE 0x1

 #define SPMI_MAX_CHANNELS 128
 #define SPMI_MAX_CHANNELS_V5	512
 #define SPMI_MAX_CHANNELS_V7	1024
 #define SPMI_MAX_SLAVES 16
 #define SPMI_MAX_PERIPH 256

 #define SPMI_CHANNEL_READ_ONLY	BIT(31)
 #define SPMI_CHANNEL_MASK	0xffff

 enum arb_ver {
 	V1 = 1,
 	V2,
 	V3,
 	V5 = 5,
 	V7 = 7
 };

 /*
  * PMIC arbiter version 5 uses different register offsets for read/write vs
  * observer channels.
  */
 enum pmic_arb_channel {
 	PMIC_ARB_CHANNEL_RW,
 	PMIC_ARB_CHANNEL_OBS,
 };

 struct msm_spmi_priv {
 	phys_addr_t arb_chnl;  /* ARB channel mapping base */
 	phys_addr_t spmi_chnls; /* SPMI channels */
 	phys_addr_t spmi_obs;  /* SPMI observer */
 	phys_addr_t spmi_cnfg;  /* SPMI config */
 	u32 owner;	/* Current owner */
 	unsigned int max_channels; /* Max channels */
 	/* SPMI channel map */
 	uint32_t channel_map[SPMI_MAX_SLAVES][SPMI_MAX_PERIPH];
 	/* SPMI bus arbiter version */
 	u32 arb_ver;
 };

 static u32 pmic_arb_fmt_cmd_v1(u8 opc, u8 sid, u8 pid, u8 off)
 {
 	return (opc << 27) | (sid << 20) | (pid << 12) | (off << 4) | 1;
 }

 static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 off)
 {
 	return (opc << 27) | (off << 4) | 1;
 }

 static int msm_spmi_write(struct udevice *dev, int usid, int pid, int off,
 			  uint8_t val)
 {
 	struct msm_spmi_priv *priv = dev_get_priv(dev);
 	unsigned channel;
 	unsigned int ch_offset;
 	uint32_t reg = 0;

 	if (usid >= SPMI_MAX_SLAVES)
 		return -EIO;
 	if (pid >= SPMI_MAX_PERIPH)
 		return -EIO;
 	if (priv->channel_map[usid][pid] & SPMI_CHANNEL_READ_ONLY)
 		return -EPERM;

 	channel = priv->channel_map[usid][pid] & SPMI_CHANNEL_MASK;

 	dev_dbg(dev, "[%d:%d] %s: channel %d\n", usid, pid, __func__, channel);

 	switch (priv->arb_ver) {
 	case V1:
 		ch_offset = SPMI_CH_OFFSET(channel);

 		reg = pmic_arb_fmt_cmd_v1(SPMI_CMD_EXT_REG_WRITE_LONG,
 					  usid, pid, off);
 		break;

 	case V2:
 		ch_offset = SPMI_CH_OFFSET(channel);

 		reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_WRITE_LONG, off);
 		break;

 	case V5:
 		ch_offset = SPMI_V5_RW_CH_OFFSET(channel);

 		reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_WRITE_LONG, off);
 		break;

 	case V7:
 		ch_offset = SPMI_V7_RW_CH_OFFSET(channel);

 		reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_WRITE_LONG, off);
 		break;
 	}

 	/* Disable IRQ mode for the current channel*/
 	writel(0x0, priv->spmi_chnls + ch_offset + SPMI_REG_CONFIG);

 	/* Write single byte */
 	writel(val, priv->spmi_chnls + ch_offset + SPMI_REG_WDATA);

 	/* Send write command */
 	writel(reg, priv->spmi_chnls + ch_offset + SPMI_REG_CMD0);

 	/* Wait till CMD DONE status */
 	reg = 0;
 	while (!reg) {
 		reg = readl(priv->spmi_chnls + ch_offset +
 			    SPMI_REG_STATUS);
 	}

 	if (reg ^ SPMI_STATUS_DONE) {
 		printf("SPMI write failure.\n");
 		return -EIO;
 	}

 	return 0;
 }

 static int msm_spmi_read(struct udevice *dev, int usid, int pid, int off)
 {
 	struct msm_spmi_priv *priv = dev_get_priv(dev);
 	unsigned channel;
 	unsigned int ch_offset;
 	uint32_t reg = 0;

 	if (usid >= SPMI_MAX_SLAVES)
 		return -EIO;
 	if (pid >= SPMI_MAX_PERIPH)
 		return -EIO;

 	channel = priv->channel_map[usid][pid] & SPMI_CHANNEL_MASK;

 	dev_dbg(dev, "[%d:%d] %s: channel %d\n", usid, pid, __func__, channel);

 	switch (priv->arb_ver) {
 	case V1:
 		ch_offset = SPMI_CH_OFFSET(channel);

 		/* Prepare read command */
 		reg = pmic_arb_fmt_cmd_v1(SPMI_CMD_EXT_REG_READ_LONG,
 					  usid, pid, off);
 		break;

 	case V2:
 		ch_offset = SPMI_CH_OFFSET(channel);

 		/* Prepare read command */
 		reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_READ_LONG, off);
 		break;

 	case V5:
 		ch_offset = SPMI_V5_OBS_CH_OFFSET(channel);

 		/* Prepare read command */
 		reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_READ_LONG, off);
 		break;

 	case V7:
 		ch_offset = SPMI_V7_OBS_CH_OFFSET(channel);

 		/* Prepare read command */
 		reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_READ_LONG, off);
 		break;
 	}

 	/* Disable IRQ mode for the current channel*/
 	writel(0x0, priv->spmi_obs + ch_offset + SPMI_REG_CONFIG);

 	/* Request read */
 	writel(reg, priv->spmi_obs + ch_offset + SPMI_REG_CMD0);

 	/* Wait till CMD DONE status */
 	reg = 0;
 	while (!reg) {
 		reg = readl(priv->spmi_obs + ch_offset + SPMI_REG_STATUS);
 	}

 	if (reg ^ SPMI_STATUS_DONE) {
 		printf("SPMI read failure.\n");
 		return -EIO;
 	}

 	/* Read the data */
 	return readl(priv->spmi_obs + ch_offset +
 				SPMI_REG_RDATA) & 0xFF;
 }

 static struct dm_spmi_ops msm_spmi_ops = {
 	.read = msm_spmi_read,
 	.write = msm_spmi_write,
 };

 static int msm_spmi_probe(struct udevice *dev)
 {
 	struct msm_spmi_priv *priv = dev_get_priv(dev);
 	phys_addr_t core_addr;
 	u32 hw_ver;
 	int i;

 	core_addr = dev_read_addr_name(dev, "core");
 	priv->spmi_chnls = dev_read_addr_name(dev, "chnls");
 	priv->spmi_obs = dev_read_addr_name(dev, "obsrvr");
 	dev_read_u32(dev, "qcom,ee", &priv->owner);

 	hw_ver = readl(core_addr + PMIC_ARB_VERSION);

 	if (hw_ver < PMIC_ARB_VERSION_V3_MIN) {
 		priv->arb_ver = V2;
 		priv->arb_chnl = core_addr + APID_MAP_OFFSET_V1_V2_V3;
 		priv->max_channels = SPMI_MAX_CHANNELS;
 	} else if (hw_ver < PMIC_ARB_VERSION_V5_MIN) {
 		priv->arb_ver = V3;
 		priv->arb_chnl = core_addr + APID_MAP_OFFSET_V1_V2_V3;
 		priv->max_channels = SPMI_MAX_CHANNELS;
 	} else if (hw_ver < PMIC_ARB_VERSION_V7_MIN) {
 		priv->arb_ver = V5;
 		priv->arb_chnl = core_addr + APID_MAP_OFFSET_V5;
 		priv->max_channels = SPMI_MAX_CHANNELS;
 		priv->spmi_cnfg = dev_read_addr_name(dev, "cnfg");
 	} else {
 		/* TOFIX: handle second bus */
 		priv->arb_ver = V7;
 		priv->arb_chnl = core_addr + APID_MAP_OFFSET_V7;
 		priv->max_channels = SPMI_MAX_CHANNELS_V7;
 		priv->spmi_cnfg = dev_read_addr_name(dev, "cnfg");
 	}

 	dev_dbg(dev, "PMIC Arb Version-%d (%#x)\n", hw_ver >> 28, hw_ver);

 	if (priv->arb_chnl == FDT_ADDR_T_NONE ||
 	    priv->spmi_chnls == FDT_ADDR_T_NONE ||
 	    priv->spmi_obs == FDT_ADDR_T_NONE)
 		return -EINVAL;

 	dev_dbg(dev, "priv->arb_chnl address (%#08llx)\n", priv->arb_chnl);
 	dev_dbg(dev, "priv->spmi_chnls address (%#08llx)\n", priv->spmi_chnls);
 	dev_dbg(dev, "priv->spmi_obs address (%#08llx)\n", priv->spmi_obs);
 	/* Scan peripherals connected to each SPMI channel */
 	for (i = 0; i < priv->max_channels; i++) {
 		uint32_t periph = readl(priv->arb_chnl + ARB_CHANNEL_OFFSET(i));
 		uint8_t slave_id = (periph & 0xf0000) >> 16;
 		uint8_t pid = (periph & 0xff00) >> 8;

 		priv->channel_map[slave_id][pid] = i;

 		/* Mark channels read-only when from different owner */
 		if (priv->arb_ver == V5 || priv->arb_ver == V7) {
 			uint32_t cnfg = readl(priv->spmi_cnfg + ARB_CHANNEL_OFFSET(i));
 			uint8_t owner = SPMI_OWNERSHIP_PERIPH2OWNER(cnfg);

 			if (owner != priv->owner)
 				priv->channel_map[slave_id][pid] |= SPMI_CHANNEL_READ_ONLY;
 		}
 	}
 	return 0;
 }

 static const struct udevice_id msm_spmi_ids[] = {
 	{ .compatible = "qcom,spmi-pmic-arb" },
 	{ }
 };

 U_BOOT_DRIVER(msm_spmi) = {
 	.name = "msm_spmi",
 	.id = UCLASS_SPMI,
 	.of_match = msm_spmi_ids,
 	.ops = &msm_spmi_ops,
 	.probe = msm_spmi_probe,
 	.priv_auto = sizeof(struct msm_spmi_priv),
 };
	// SPDX-License-Identifier: BSD-3-Clause
	/*
	* Qualcomm SPMI bus driver
	*
	* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
	*
	* Loosely based on Little Kernel driver
	*/

	#include <dm.h>
	#include <errno.h>
	#include <fdtdec.h>
	#include <asm/global_data.h>
	#include <asm/io.h>
	#include <dm/device_compat.h>
	#include <spmi/spmi.h>

	DECLARE_GLOBAL_DATA_PTR;

	/* PMIC Arbiter configuration registers */
	#define PMIC_ARB_VERSION 0x0000
	#define PMIC_ARB_VERSION_V2_MIN 0x20010000
	#define PMIC_ARB_VERSION_V3_MIN 0x30000000
	#define PMIC_ARB_VERSION_V5_MIN 0x50000000
	#define PMIC_ARB_VERSION_V7_MIN 0x70000000

	#define APID_MAP_OFFSET_V1_V2_V3 (0x800)
	#define APID_MAP_OFFSET_V5 (0x900)
	#define APID_MAP_OFFSET_V7 (0x2000)
	#define ARB_CHANNEL_OFFSET(n) (0x4 * (n))
	#define SPMI_CH_OFFSET(chnl) ((chnl) * 0x8000)
	#define SPMI_V5_OBS_CH_OFFSET(chnl) ((chnl) * 0x80)
	#define SPMI_V7_OBS_CH_OFFSET(chnl) ((chnl) * 0x20)
	#define SPMI_V5_RW_CH_OFFSET(chnl) ((chnl) * 0x10000)
	#define SPMI_V7_RW_CH_OFFSET(chnl) ((chnl) * 0x1000)

	#define SPMI_OWNERSHIP_PERIPH2OWNER(x) ((x) & 0x7)

	#define SPMI_REG_CMD0 0x0
	#define SPMI_REG_CONFIG 0x4
	#define SPMI_REG_STATUS 0x8
	#define SPMI_REG_WDATA 0x10
	#define SPMI_REG_RDATA 0x18

	#define SPMI_CMD_OPCODE_SHIFT 27
	#define SPMI_CMD_SLAVE_ID_SHIFT 20
	#define SPMI_CMD_ADDR_SHIFT 12
	#define SPMI_CMD_ADDR_OFFSET_SHIFT 4
	#define SPMI_CMD_BYTE_CNT_SHIFT 0

	#define SPMI_CMD_EXT_REG_WRITE_LONG 0x00
	#define SPMI_CMD_EXT_REG_READ_LONG 0x01

	#define SPMI_STATUS_DONE 0x1

	#define SPMI_MAX_CHANNELS 128
	#define SPMI_MAX_CHANNELS_V5 512
	#define SPMI_MAX_CHANNELS_V7 1024
	#define SPMI_MAX_SLAVES 16
	#define SPMI_MAX_PERIPH 256

	#define SPMI_CHANNEL_READ_ONLY BIT(31)
	#define SPMI_CHANNEL_MASK 0xffff

	enum arb_ver {
	V1 = 1,
	V2,
	V3,
	V5 = 5,
	V7 = 7
	};

	/*
	* PMIC arbiter version 5 uses different register offsets for read/write vs
	* observer channels.
	*/
	enum pmic_arb_channel {
	PMIC_ARB_CHANNEL_RW,
	PMIC_ARB_CHANNEL_OBS,
	};

	struct msm_spmi_priv {
	phys_addr_t arb_chnl; /* ARB channel mapping base */
	phys_addr_t spmi_chnls; /* SPMI channels */
	phys_addr_t spmi_obs; /* SPMI observer */
	phys_addr_t spmi_cnfg; /* SPMI config */
	u32 owner; /* Current owner */
	unsigned int max_channels; /* Max channels */
	/* SPMI channel map */
	uint32_t channel_map[SPMI_MAX_SLAVES][SPMI_MAX_PERIPH];
	/* SPMI bus arbiter version */
	u32 arb_ver;
	};

	static u32 pmic_arb_fmt_cmd_v1(u8 opc, u8 sid, u8 pid, u8 off)
	{
	return (opc << 27) \| (sid << 20) \| (pid << 12) \| (off << 4) \| 1;
	}

	static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 off)
	{
	return (opc << 27) \| (off << 4) \| 1;
	}

	static int msm_spmi_write(struct udevice *dev, int usid, int pid, int off,
	uint8_t val)
	{
	struct msm_spmi_priv *priv = dev_get_priv(dev);
	unsigned channel;
	unsigned int ch_offset;
	uint32_t reg = 0;

	if (usid >= SPMI_MAX_SLAVES)
	return -EIO;
	if (pid >= SPMI_MAX_PERIPH)
	return -EIO;
	if (priv->channel_map[usid][pid] & SPMI_CHANNEL_READ_ONLY)
	return -EPERM;

	channel = priv->channel_map[usid][pid] & SPMI_CHANNEL_MASK;

	dev_dbg(dev, "[%d:%d] %s: channel %d\n", usid, pid, __func__, channel);

	switch (priv->arb_ver) {
	case V1:
	ch_offset = SPMI_CH_OFFSET(channel);

	reg = pmic_arb_fmt_cmd_v1(SPMI_CMD_EXT_REG_WRITE_LONG,
	usid, pid, off);
	break;

	case V2:
	ch_offset = SPMI_CH_OFFSET(channel);

	reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_WRITE_LONG, off);
	break;

	case V5:
	ch_offset = SPMI_V5_RW_CH_OFFSET(channel);

	reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_WRITE_LONG, off);
	break;

	case V7:
	ch_offset = SPMI_V7_RW_CH_OFFSET(channel);

	reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_WRITE_LONG, off);
	break;
	}

	/* Disable IRQ mode for the current channel*/
	writel(0x0, priv->spmi_chnls + ch_offset + SPMI_REG_CONFIG);

	/* Write single byte */
	writel(val, priv->spmi_chnls + ch_offset + SPMI_REG_WDATA);

	/* Send write command */
	writel(reg, priv->spmi_chnls + ch_offset + SPMI_REG_CMD0);

	/* Wait till CMD DONE status */
	reg = 0;
	while (!reg) {
	reg = readl(priv->spmi_chnls + ch_offset +
	SPMI_REG_STATUS);
	}

	if (reg ^ SPMI_STATUS_DONE) {
	printf("SPMI write failure.\n");
	return -EIO;
	}

	return 0;
	}

	static int msm_spmi_read(struct udevice *dev, int usid, int pid, int off)
	{
	struct msm_spmi_priv *priv = dev_get_priv(dev);
	unsigned channel;
	unsigned int ch_offset;
	uint32_t reg = 0;

	if (usid >= SPMI_MAX_SLAVES)
	return -EIO;
	if (pid >= SPMI_MAX_PERIPH)
	return -EIO;

	channel = priv->channel_map[usid][pid] & SPMI_CHANNEL_MASK;

	dev_dbg(dev, "[%d:%d] %s: channel %d\n", usid, pid, __func__, channel);

	switch (priv->arb_ver) {
	case V1:
	ch_offset = SPMI_CH_OFFSET(channel);

	/* Prepare read command */
	reg = pmic_arb_fmt_cmd_v1(SPMI_CMD_EXT_REG_READ_LONG,
	usid, pid, off);
	break;

	case V2:
	ch_offset = SPMI_CH_OFFSET(channel);

	/* Prepare read command */
	reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_READ_LONG, off);
	break;

	case V5:
	ch_offset = SPMI_V5_OBS_CH_OFFSET(channel);

	/* Prepare read command */
	reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_READ_LONG, off);
	break;

	case V7:
	ch_offset = SPMI_V7_OBS_CH_OFFSET(channel);

	/* Prepare read command */
	reg = pmic_arb_fmt_cmd_v2(SPMI_CMD_EXT_REG_READ_LONG, off);
	break;
	}

	/* Disable IRQ mode for the current channel*/
	writel(0x0, priv->spmi_obs + ch_offset + SPMI_REG_CONFIG);

	/* Request read */
	writel(reg, priv->spmi_obs + ch_offset + SPMI_REG_CMD0);

	/* Wait till CMD DONE status */
	reg = 0;
	while (!reg) {
	reg = readl(priv->spmi_obs + ch_offset + SPMI_REG_STATUS);
	}

	if (reg ^ SPMI_STATUS_DONE) {
	printf("SPMI read failure.\n");
	return -EIO;
	}

	/* Read the data */
	return readl(priv->spmi_obs + ch_offset +
	SPMI_REG_RDATA) & 0xFF;
	}

	static struct dm_spmi_ops msm_spmi_ops = {
	.read = msm_spmi_read,
	.write = msm_spmi_write,
	};

	static int msm_spmi_probe(struct udevice *dev)
	{
	struct msm_spmi_priv *priv = dev_get_priv(dev);
	phys_addr_t core_addr;
	u32 hw_ver;
	int i;

	core_addr = dev_read_addr_name(dev, "core");
	priv->spmi_chnls = dev_read_addr_name(dev, "chnls");
	priv->spmi_obs = dev_read_addr_name(dev, "obsrvr");
	dev_read_u32(dev, "qcom,ee", &priv->owner);

	hw_ver = readl(core_addr + PMIC_ARB_VERSION);

	if (hw_ver < PMIC_ARB_VERSION_V3_MIN) {
	priv->arb_ver = V2;
	priv->arb_chnl = core_addr + APID_MAP_OFFSET_V1_V2_V3;
	priv->max_channels = SPMI_MAX_CHANNELS;
	} else if (hw_ver < PMIC_ARB_VERSION_V5_MIN) {
	priv->arb_ver = V3;
	priv->arb_chnl = core_addr + APID_MAP_OFFSET_V1_V2_V3;
	priv->max_channels = SPMI_MAX_CHANNELS;
	} else if (hw_ver < PMIC_ARB_VERSION_V7_MIN) {
	priv->arb_ver = V5;
	priv->arb_chnl = core_addr + APID_MAP_OFFSET_V5;
	priv->max_channels = SPMI_MAX_CHANNELS;
	priv->spmi_cnfg = dev_read_addr_name(dev, "cnfg");
	} else {
	/* TOFIX: handle second bus */
	priv->arb_ver = V7;
	priv->arb_chnl = core_addr + APID_MAP_OFFSET_V7;
	priv->max_channels = SPMI_MAX_CHANNELS_V7;
	priv->spmi_cnfg = dev_read_addr_name(dev, "cnfg");
	}

	dev_dbg(dev, "PMIC Arb Version-%d (%#x)\n", hw_ver >> 28, hw_ver);

	if (priv->arb_chnl == FDT_ADDR_T_NONE \|\|
	priv->spmi_chnls == FDT_ADDR_T_NONE \|\|
	priv->spmi_obs == FDT_ADDR_T_NONE)
	return -EINVAL;

	dev_dbg(dev, "priv->arb_chnl address (%#08llx)\n", priv->arb_chnl);
	dev_dbg(dev, "priv->spmi_chnls address (%#08llx)\n", priv->spmi_chnls);
	dev_dbg(dev, "priv->spmi_obs address (%#08llx)\n", priv->spmi_obs);
	/* Scan peripherals connected to each SPMI channel */
	for (i = 0; i < priv->max_channels; i++) {
	uint32_t periph = readl(priv->arb_chnl + ARB_CHANNEL_OFFSET(i));
	uint8_t slave_id = (periph & 0xf0000) >> 16;
	uint8_t pid = (periph & 0xff00) >> 8;

	priv->channel_map[slave_id][pid] = i;

	/* Mark channels read-only when from different owner */
	if (priv->arb_ver == V5 \|\| priv->arb_ver == V7) {
	uint32_t cnfg = readl(priv->spmi_cnfg + ARB_CHANNEL_OFFSET(i));
	uint8_t owner = SPMI_OWNERSHIP_PERIPH2OWNER(cnfg);

	if (owner != priv->owner)
	priv->channel_map[slave_id][pid] \|= SPMI_CHANNEL_READ_ONLY;
	}
	}
	return 0;
	}

	static const struct udevice_id msm_spmi_ids[] = {
	{ .compatible = "qcom,spmi-pmic-arb" },
	{ }
	};

	U_BOOT_DRIVER(msm_spmi) = {
	.name = "msm_spmi",
	.id = UCLASS_SPMI,
	.of_match = msm_spmi_ids,
	.ops = &msm_spmi_ops,
	.probe = msm_spmi_probe,
	.priv_auto = sizeof(struct msm_spmi_priv),
	};