phy: sun4i-usb: Support VBUS detection via power supply
The device tree binding provides for getting VBUS state from a device
referenced by phandle, as an optional alternative to using a GPIO. In
U-Boot, where there is no power supply class, this VBUS detection will
be implemented using a regulator device and its get_enable method.
Let's hook this up to the PHY driver.
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/phy/allwinner/phy-sun4i-usb.c b/drivers/phy/allwinner/phy-sun4i-usb.c
index 827ecd7..ab2a5d1 100644
--- a/drivers/phy/allwinner/phy-sun4i-usb.c
+++ b/drivers/phy/allwinner/phy-sun4i-usb.c
@@ -26,6 +26,7 @@
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/err.h>
+#include <power/regulator.h>
#define REG_ISCR 0x00
#define REG_PHYCTL_A10 0x04
@@ -137,6 +138,7 @@
void __iomem *base;
const struct sun4i_usb_phy_cfg *cfg;
struct sun4i_usb_phy_plat *usb_phy;
+ struct udevice *vbus_power_supply;
};
static int initial_usb_scan_delay = CONFIG_INITIAL_USB_SCAN_DELAY;
@@ -404,6 +406,8 @@
mdelay(100);
err = gpio_get_value(usb_phy->gpio_vbus_det);
}
+ } else if (data->vbus_power_supply) {
+ err = regulator_get_enable(data->vbus_power_supply);
}
return err;
@@ -447,6 +451,9 @@
if (IS_ERR(data->base))
return PTR_ERR(data->base);
+ device_get_supply_regulator(dev, "usb0_vbus_power-supply",
+ &data->vbus_power_supply);
+
data->usb_phy = plat;
for (i = 0; i < data->cfg->num_phys; i++) {
struct sun4i_usb_phy_plat *phy = &plat[i];