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phy: sun4i-usb: Support VBUS detection via power supply

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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>
This commit is contained in:
Samuel Holland 2021-09-12 09:22:42 -05:00 committed by Andre Przywara
parent 1da7b88cad
commit 6fa41cdd19
2 changed files with 8 additions and 0 deletions
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1
drivers/phy/allwinner/Kconfig
View file

@ -4,6 +4,7 @@
config PHY_SUN4I_USB
bool "Allwinner Sun4I USB PHY driver"
depends on ARCH_SUNXI
select DM_REGULATOR
select PHY
help
Enable this to support the transceiver that is part of Allwinner

7
drivers/phy/allwinner/phy-sun4i-usb.c
View file

@ -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 @@ struct sun4i_usb_phy_data {
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 @@ int sun4i_usb_phy_vbus_detect(struct phy *phy)
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 @@ static int sun4i_usb_phy_probe(struct udevice *dev)
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];