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 Reviewed-by: Marek Vasut marex@denx.de --- v7: - add #ifdef protection around clk_disable error path
v6: - move changes to clk to separate patch - sort new vars in reverse christmas tree style
v5: - remove #if CONFIG_IS_ENABLED around struct members (you can not conditionally include if using if (CONFIG_IS_ENABLED(foo)) ) - replace clk '#if CONFIG_IS_ENABLED(CLK)' with 'if (CONFIG_IS_ENABLED(CLK))'
v4: - use regulator_set_enable_if_allowed to handle regulator reference counting errors - added Marek's rb tag
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 Signed-off-by: Tim Harvey tharvey@gateworks.com --- drivers/phy/phy-imx8mq-usb.c | 39 +++++++++++++++++++++++++++++++++--- 1 file changed, 36 insertions(+), 3 deletions(-)
diff --git a/drivers/phy/phy-imx8mq-usb.c b/drivers/phy/phy-imx8mq-usb.c index 69f01de55538..9fa78ef4da3d 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 +83,7 @@ struct imx8mq_usb_phy { #endif void __iomem *base; enum imx8mpq_phy_type type; + struct udevice *vbus_supply; };
static const struct udevice_id imx8mq_usb_phy_of_match[] = { @@ -173,9 +176,9 @@ 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); u32 value; + int ret;
#if CONFIG_IS_ENABLED(CLK) - int ret; ret = clk_enable(&imx_phy->phy_clk); if (ret) { printf("Failed to enable usb phy clock\n"); @@ -183,12 +186,26 @@ 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_if_allowed(imx_phy->vbus_supply, true); + if (ret && ret != -ENOSYS) { + 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: +#if CONFIG_IS_ENABLED(CLK) + clk_disable(&imx_phy->phy_clk); +#endif + return ret; }
static int imx8mq_usb_phy_power_off(struct phy *usb_phy) @@ -196,6 +213,7 @@ 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); u32 value; + int ret;
/* Override rx term to be 0 */ value = readl(imx_phy->base + PHY_CTRL6); @@ -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_if_allowed(imx_phy->vbus_supply, false); + if (ret && ret != -ENOSYS) { + 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); + int ret;
priv->type = dev_get_driver_data(dev); priv->base = dev_read_addr_ptr(dev); @@ -232,8 +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); if (ret) { @@ -241,6 +266,14 @@ int imx8mq_usb_phy_probe(struct udevice *dev) return ret; } #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; }