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/axp_usb_power.c b/drivers/power/regulator/axp_usb_power.c
new file mode 100644
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,
+};