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

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>
Acked-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index c346d03..eb5aa38 100644 (file)
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -57,6 +57,13 @@ config SPL_REGULATOR_AXP
          Enable support in SPL for the regulators (DCDCs, LDOs) in the
          X-Powers AXP152, AXP2xx, and AXP8xx PMICs.
 
+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

diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
index 2d97e10..d9e0cd5 100644 (file)
--- a/drivers/power/regulator/Makefile
+++ b/drivers/power/regulator/Makefile
@@ -8,6 +8,7 @@ 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) += axp_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_DM_REGULATOR_NPCM8XX) += npcm8xx_regulator.o

diff --git a/drivers/power/regulator/axp_usb_power.c b/drivers/power/regulator/axp_usb_power.c
new file mode 100644 (file)
index 0000000..f32fb6a
--- /dev/null
+++ b/drivers/power/regulator/axp_usb_power.c
@@ -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,
+};