arm64: dts: rockchip: Correct regulator for USB host

From: Chris Morgan <[email protected]>

When writing a battery driver, I noticed that the USB voltage was ~3.7V while running off of battery on a mainline kernel. After consulting the schematics for the Odroid Go Advance, it appears that the BOOST regulator is involved in the process of powering the USB host. Power for the USB host goes from the vccsys regulator into the PMIC, then out from the PMIC BOOST regulator into the FC9516A (which is controlled by GPIO), which then feeds power into the USB host. I named the regulator usb_midu because on the datasheet the pin is described as "MIDU/BOOST - middle point of USB power supply / boost output". Making these changes solved the USB power issue on battery and I'm now reading approximately 5V. Note that as a result of this you will receive a warning on dmesg of " reg-fixed-voltage vcc_host: Failed to register regulator: -517". This is because the supplying regulator for the fixed regulator is not available until later.

Changes since v1:
- Removed phy-supply, as this generated a warning in dmesg.

---
 arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

index 7fc674a99a6c..79d2f86ab46d 100644
@@ -207,7 +207,7 @@ vcc_host: vcc_host {
 		gpio = <&gpio0 RK_PB7 GPIO_ACTIVE_HIGH>;
 		enable-active-high;
 		regulator-always-on;
-		vin-supply = <&vccsys>;
+		vin-supply = <&usb_midu>;
 	};
 };
 

@@ -311,6 +311,7 @@ rk817: pmic@20 {
 		vcc5-supply = <&vccsys>;
 		vcc6-supply = <&vccsys>;
 		vcc7-supply = <&vccsys>;
+		vcc8-supply = <&vccsys>;
 
 		regulators {
 			vdd_logic: DCDC_REG1 {

@@ -460,6 +461,14 @@ regulator-state-mem {
 					regulator-suspend-microvolt = <3000000>;
 				};
 			};
+
+			usb_midu: BOOST {
+				regulator-name = "usb_midu";
+				regulator-min-microvolt = <5000000>;
+				regulator-max-microvolt = <5400000>;
+				regulator-always-on;
+				regulator-boot-on;
+			};
 		};
 
 		rk817_codec: codec {

2.25.1