[PATCH v2] arm64: dts: rockchip: Correct regulator for USB host

[PATCH v2] arm64: dts: rockchip: Correct regulator for USB host

[Chris Morgan]

From: Chris Morgan <macromorgan@hotmail.com>

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.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts b/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
index 7fc674a99a6c..79d2f86ab46d 100644
--- a/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
@@ -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