phy: stm32: usbphyc: manage optional vbus regulator on phy_power_on/off

This patch adds support for optional vbus regulator.
It is managed on phy_power_on/off calls and may be needed for host mode.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>

diff --git a/doc/device-tree-bindings/phy/phy-stm32-usbphyc.txt b/doc/device-tree-bindings/phy/phy-stm32-usbphyc.txt
index da98407..edfe4b4 100644 (file)
--- a/doc/device-tree-bindings/phy/phy-stm32-usbphyc.txt
+++ b/doc/device-tree-bindings/phy/phy-stm32-usbphyc.txt
@@ -45,6 +45,8 @@ Required properties:
 - #phy-cells: see phy-bindings.txt in the same directory, must be <0> for PHY
   port#1 and must be <1> for PHY port#2, to select USB controller
 
+Optional properties:
+- vbus-supply: phandle to the regulator providing 5V vbus to the USB connector
 
 Example:
                usbphyc: usb-phy@5a006000 {

diff --git a/drivers/phy/phy-stm32-usbphyc.c b/drivers/phy/phy-stm32-usbphyc.c
index 9d4296d..ab4a913 100644 (file)
--- a/drivers/phy/phy-stm32-usbphyc.c
+++ b/drivers/phy/phy-stm32-usbphyc.c
@@ -59,6 +59,7 @@ struct stm32_usbphyc {
        struct udevice *vdda1v8;
        struct stm32_usbphyc_phy {
                struct udevice *vdd;
+               struct udevice *vbus;
                bool init;
                bool powered;
        } phys[MAX_PHYS];
@@ -244,6 +245,11 @@ static int stm32_usbphyc_phy_power_on(struct phy *phy)
                if (ret)
                        return ret;
        }
+       if (usbphyc_phy->vbus) {
+               ret = regulator_set_enable(usbphyc_phy->vbus, true);
+               if (ret)
+                       return ret;
+       }
 
        usbphyc_phy->powered = true;
 
@@ -262,6 +268,11 @@ static int stm32_usbphyc_phy_power_off(struct phy *phy)
        if (stm32_usbphyc_is_powered(usbphyc))
                return 0;
 
+       if (usbphyc_phy->vbus) {
+               ret = regulator_set_enable(usbphyc_phy->vbus, false);
+               if (ret)
+                       return ret;
+       }
        if (usbphyc_phy->vdd) {
                ret = regulator_set_enable_if_allowed(usbphyc_phy->vdd, false);
                if (ret)
@@ -271,7 +282,7 @@ static int stm32_usbphyc_phy_power_off(struct phy *phy)
        return 0;
 }
 
-static int stm32_usbphyc_get_regulator(struct udevice *dev, ofnode node,
+static int stm32_usbphyc_get_regulator(ofnode node,
                                       char *supply_name,
                                       struct udevice **regulator)
 {
@@ -281,19 +292,14 @@ static int stm32_usbphyc_get_regulator(struct udevice *dev, ofnode node,
        ret = ofnode_parse_phandle_with_args(node, supply_name,
                                             NULL, 0, 0,
                                             &regulator_phandle);
-       if (ret) {
-               dev_err(dev, "Can't find %s property (%d)\n", supply_name, ret);
+       if (ret)
                return ret;
-       }
 
        ret = uclass_get_device_by_ofnode(UCLASS_REGULATOR,
                                          regulator_phandle.node,
                                          regulator);
-
-       if (ret) {
-               dev_err(dev, "Can't get %s regulator (%d)\n", supply_name, ret);
+       if (ret)
                return ret;
-       }
 
        return 0;
 }
@@ -380,10 +386,17 @@ static int stm32_usbphyc_probe(struct udevice *dev)
 
                usbphyc_phy->init = false;
                usbphyc_phy->powered = false;
-               ret = stm32_usbphyc_get_regulator(dev, node, "phy-supply",
+               ret = stm32_usbphyc_get_regulator(node, "phy-supply",
                                                  &usbphyc_phy->vdd);
-               if (ret)
+               if (ret) {
+                       dev_err(dev, "Can't get phy-supply regulator\n");
                        return ret;
+               }
+
+               ret = stm32_usbphyc_get_regulator(node, "vbus-supply",
+                                                 &usbphyc_phy->vbus);
+               if (ret)
+                       usbphyc_phy->vbus = NULL;
 
                node = dev_read_next_subnode(node);
        }