power: regulator: Add a driver for the AXP PMIC drivevbus
AXP PMICs have a pin which can either report the USB VBUS state, or
driving a regulator that supplies USB VBUS. Add a regulator driver for
controlling this pin. The selection between input and output is done via
the x-powers,drive-vbus-en pin on the PMIC (parent) node.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
diff --git a/drivers/power/regulator/axp_drivevbus.c b/drivers/power/regulator/axp_drivevbus.c
new file mode 100644
index 0000000..c463de8
--- /dev/null
+++ b/drivers/power/regulator/axp_drivevbus.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <dm.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+
+#define AXP_VBUS_IPSOUT 0x30
+#define AXP_VBUS_IPSOUT_DRIVEBUS BIT(2)
+#define AXP_MISC_CTRL 0x8f
+#define AXP_MISC_CTRL_N_VBUSEN_FUNC BIT(4)
+
+static int axp_drivevbus_get_enable(struct udevice *dev)
+{
+ int ret;
+
+ ret = pmic_reg_read(dev->parent, AXP_VBUS_IPSOUT);
+ if (ret < 0)
+ return ret;
+
+ return !!(ret & AXP_VBUS_IPSOUT_DRIVEBUS);
+}
+
+static int axp_drivevbus_set_enable(struct udevice *dev, bool enable)
+{
+ return pmic_clrsetbits(dev->parent, AXP_VBUS_IPSOUT,
+ AXP_VBUS_IPSOUT_DRIVEBUS,
+ enable ? AXP_VBUS_IPSOUT_DRIVEBUS : 0);
+}
+
+static const struct dm_regulator_ops axp_drivevbus_ops = {
+ .get_enable = axp_drivevbus_get_enable,
+ .set_enable = axp_drivevbus_set_enable,
+};
+
+static int axp_drivevbus_probe(struct udevice *dev)
+{
+ struct dm_regulator_uclass_plat *uc_plat = dev_get_uclass_plat(dev);
+ int ret;
+
+ uc_plat->type = REGULATOR_TYPE_FIXED;
+
+ if (dev_read_bool(dev->parent, "x-powers,drive-vbus-en")) {
+ ret = pmic_clrsetbits(dev->parent, AXP_MISC_CTRL,
+ AXP_MISC_CTRL_N_VBUSEN_FUNC, 0);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+U_BOOT_DRIVER(axp_drivevbus) = {
+ .name = "axp_drivevbus",
+ .id = UCLASS_REGULATOR,
+ .probe = axp_drivevbus_probe,
+ .ops = &axp_drivevbus_ops,
+};