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

[Patrick Delaunay]

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 at st.com>
---

 .../phy/phy-stm32-usbphyc.txt                 |  2 ++
 drivers/phy/phy-stm32-usbphyc.c               | 33 +++++++++++++------
 2 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/doc/device-tree-bindings/phy/phy-stm32-usbphyc.txt b/doc/device-tree-bindings/phy/phy-stm32-usbphyc.txt
index da98407403..edfe4b426c 100644
--- 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 at 5a006000 {
diff --git a/drivers/phy/phy-stm32-usbphyc.c b/drivers/phy/phy-stm32-usbphyc.c
index 9d4296d649..ab4a913c93 100644
--- 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);
 	}
-- 
2.17.1