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power: regulator: Add a driver for the AXP USB power supply

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This driver reports the presence/absence of voltage on the PMIC's USB
VBUS pin. This information is used by the USB PHY driver. The
corresponding Linux driver uses the power supply class, which does not
exist in U-Boot. UCLASS_REGULATOR seems to be the closest match.

Signed-off-by: Samuel Holland <samuel@sholland.org>
This commit is contained in:
Samuel Holland 2021-08-22 21:35:45 -05:00
parent 170e14527d
commit 719d3f9911
3 changed files with 57 additions and 0 deletions
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7
drivers/power/regulator/Kconfig
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@ -43,6 +43,13 @@ config REGULATOR_AS3722
but does not yet support change voltages. Currently this must be
done using direct register writes to the PMIC.
config REGULATOR_AXP_USB_POWER
bool "Enable driver for X-Powers AXP PMIC USB power supply"
depends on DM_REGULATOR && PMIC_AXP
help
Enable support for reading the USB power supply status from
X-Powers AXP2xx and AXP8xx PMICs.
config DM_REGULATOR_BD71837
bool "Enable Driver Model for ROHM BD71837/BD71847 regulators"
depends on DM_REGULATOR && DM_PMIC_BD71837

1
drivers/power/regulator/Makefile
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@ -7,6 +7,7 @@
obj-$(CONFIG_$(SPL_)DM_REGULATOR) += regulator-uclass.o
obj-$(CONFIG_REGULATOR_ACT8846) += act8846.o
obj-$(CONFIG_REGULATOR_AS3722) += as3722_regulator.o
obj-$(CONFIG_$(SPL_)REGULATOR_AXP_USB_POWER) += axp_usb_power.o
obj-$(CONFIG_$(SPL_)DM_REGULATOR_DA9063) += da9063.o
obj-$(CONFIG_DM_REGULATOR_MAX77686) += max77686.o
obj-$(CONFIG_$(SPL_)DM_PMIC_PFUZE100) += pfuze100.o

49
drivers/power/regulator/axp_usb_power.c Normal file
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@ -0,0 +1,49 @@
// SPDX-License-Identifier: GPL-2.0+
#include <dm/device.h>
#include <errno.h>
#include <power/pmic.h>
#include <power/regulator.h>
#define AXP_POWER_STATUS 0x00
#define AXP_POWER_STATUS_VBUS_PRESENT BIT(5)
static int axp_usb_power_get_enable(struct udevice *dev)
{
int ret;
ret = pmic_reg_read(dev->parent, AXP_POWER_STATUS);
if (ret < 0)
return ret;
return !!(ret & AXP_POWER_STATUS_VBUS_PRESENT);
}
static const struct dm_regulator_ops axp_usb_power_ops = {
.get_enable = axp_usb_power_get_enable,
};
static int axp_usb_power_probe(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_plat = dev_get_uclass_plat(dev);
uc_plat->type = REGULATOR_TYPE_FIXED;
return 0;
}
static const struct udevice_id axp_usb_power_ids[] = {
{ .compatible = "x-powers,axp202-usb-power-supply" },
{ .compatible = "x-powers,axp221-usb-power-supply" },
{ .compatible = "x-powers,axp223-usb-power-supply" },
{ .compatible = "x-powers,axp813-usb-power-supply" },
{ }
};
U_BOOT_DRIVER(axp_usb_power) = {
.name = "axp_usb_power",
.id = UCLASS_REGULATOR,
.of_match = axp_usb_power_ids,
.probe = axp_usb_power_probe,
.ops = &axp_usb_power_ops,
};