Add support for enabling and disabling vbus-supply regulator found on several imx8mp boards in the usb3_phy0 and usb3_phy1 nodes.
Signed-off-by: Tim Harvey tharvey@gateworks.com Reviewed-by: Adam Ford aford173@gmail.com --- v3: - change pr_err to dev_err - add #if CONFIG_IS_ENABLED around vbus_supply in struct - add fail path to disable clock if regulator enable failed
v2: - protect ret with __maybe_unused in case CONFIG_CLK and CONFIG_DM_REGULATOR not defined - add error prints on failures - add Adam's rb tag --- drivers/phy/phy-imx8mq-usb.c | 39 ++++++++++++++++++++++++++++++++++-- 1 file changed, 37 insertions(+), 2 deletions(-)
diff --git a/drivers/phy/phy-imx8mq-usb.c b/drivers/phy/phy-imx8mq-usb.c index 69f01de55538..cbd96a0bd4df 100644 --- a/drivers/phy/phy-imx8mq-usb.c +++ b/drivers/phy/phy-imx8mq-usb.c @@ -14,6 +14,8 @@ #include <linux/delay.h> #include <linux/err.h> #include <clk.h> +#include <dm/device_compat.h> +#include <power/regulator.h>
#define PHY_CTRL0 0x0 #define PHY_CTRL0_REF_SSP_EN BIT(2) @@ -81,6 +83,9 @@ struct imx8mq_usb_phy { #endif void __iomem *base; enum imx8mpq_phy_type type; +#if CONFIG_IS_ENABLED(DM_REGULATOR) + struct udevice *vbus_supply; +#endif };
static const struct udevice_id imx8mq_usb_phy_of_match[] = { @@ -172,10 +177,10 @@ static int imx8mq_usb_phy_power_on(struct phy *usb_phy) { struct udevice *dev = usb_phy->dev; struct imx8mq_usb_phy *imx_phy = dev_get_priv(dev); + __maybe_unused int ret; u32 value;
#if CONFIG_IS_ENABLED(CLK) - int ret; ret = clk_enable(&imx_phy->phy_clk); if (ret) { printf("Failed to enable usb phy clock\n"); @@ -183,18 +188,31 @@ static int imx8mq_usb_phy_power_on(struct phy *usb_phy) } #endif
+ if (CONFIG_IS_ENABLED(DM_REGULATOR) && imx_phy->vbus_supply) { + ret = regulator_set_enable(imx_phy->vbus_supply, true); + if (ret) { + dev_err(dev, "Failed to enable VBUS regulator: %d\n", ret); + goto err; + } + } + /* Disable rx term override */ value = readl(imx_phy->base + PHY_CTRL6); value &= ~PHY_CTRL6_RXTERM_OVERRIDE_SEL; writel(value, imx_phy->base + PHY_CTRL6);
return 0; + +err: + clk_disable(&imx_phy->phy_clk); + return ret; }
static int imx8mq_usb_phy_power_off(struct phy *usb_phy) { struct udevice *dev = usb_phy->dev; struct imx8mq_usb_phy *imx_phy = dev_get_priv(dev); + __maybe_unused int ret; u32 value;
/* Override rx term to be 0 */ @@ -206,6 +224,14 @@ static int imx8mq_usb_phy_power_off(struct phy *usb_phy) clk_disable(&imx_phy->phy_clk); #endif
+ if (CONFIG_IS_ENABLED(DM_REGULATOR) && imx_phy->vbus_supply) { + ret = regulator_set_enable(imx_phy->vbus_supply, false); + if (ret) { + dev_err(dev, "Failed to disable VBUS regulator: %d\n", ret); + return ret; + } + } + return 0; }
@@ -224,6 +250,7 @@ struct phy_ops imx8mq_usb_phy_ops = { int imx8mq_usb_phy_probe(struct udevice *dev) { struct imx8mq_usb_phy *priv = dev_get_priv(dev); + __maybe_unused int ret;
priv->type = dev_get_driver_data(dev); priv->base = dev_read_addr_ptr(dev); @@ -232,7 +259,6 @@ int imx8mq_usb_phy_probe(struct udevice *dev) return -EINVAL;
#if CONFIG_IS_ENABLED(CLK) - int ret;
/* Assigned clock already set clock */ ret = clk_get_by_name(dev, "phy", &priv->phy_clk); @@ -242,6 +268,15 @@ int imx8mq_usb_phy_probe(struct udevice *dev) } #endif
+ if (CONFIG_IS_ENABLED(DM_REGULATOR)) { + ret = device_get_supply_regulator(dev, "vbus-supply", + &priv->vbus_supply); + if (ret && ret != -ENOENT) { + dev_err(dev, "Failed to get VBUS regulator: %d\n", ret); + return ret; + } + } + return 0; }