phy: phy-imx8mq-usb: add vbus regulator support

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>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>

diff --git a/drivers/phy/phy-imx8mq-usb.c b/drivers/phy/phy-imx8mq-usb.c
index 69f01de..9fa78ef 100644 (file)
--- 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;
 }