[openwrt/openwrt] ipq40xx: Linksys MR8300: fix the USB port power

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-22.03:
https://git.openwrt.org/b7c031d93388b77cc8ed8345b247359b68c9283f

commit b7c031d93388b77cc8ed8345b247359b68c9283f
Author: Daniel González Cabanelas <dgcbueu at gmail.com>
AuthorDate: Thu Feb 16 23:04:20 2023 +0100

    ipq40xx: Linksys MR8300: fix the USB port power
    
    The USB port on the MR8300 randomly fails to feed bus-powered devices.
    
    This is caused by a misconfigured pinmux. The GPIO68 should be used to
    enable the USB power (active low), but it's inside the NAND pinmux.
    
    This GPIO pin was found in the original firmware at a startup script in
    both MR8300 and EA8300. Therefore apply the fix for both boards.
    
    Signed-off-by: Daniel González Cabanelas <dgcbueu at gmail.com>
    Reviewed-by: Robert Marko <robimarko at gmail.com>
    (cherry picked from commit ed64c3323590e3c9fa8b423bf37689023a7a101f)
    
    Signed-off-by: Steffen Scheib <steffen at scheib.me>
---
 .../ipq40xx/files/arch/arm/boot/dts/qcom-ipq4019-xx8300.dtsi | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/target/linux/ipq40xx/files/arch/arm/boot/dts/qcom-ipq4019-xx8300.dtsi b/target/linux/ipq40xx/files/arch/arm/boot/dts/qcom-ipq4019-xx8300.dtsi
index 8f971e505c..cb75e86c74 100644
--- a/target/linux/ipq40xx/files/arch/arm/boot/dts/qcom-ipq4019-xx8300.dtsi
+++ b/target/linux/ipq40xx/files/arch/arm/boot/dts/qcom-ipq4019-xx8300.dtsi
@@ -112,6 +112,16 @@
 			status = "okay";
 		};
 	};
+
+	regulator-usb-vbus {
+		compatible = "regulator-fixed";
+		regulator-name = "USB_VBUS";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		regulator-always-on;
+		regulator-boot-on;
+		gpio = <&tlmm 68 GPIO_ACTIVE_LOW>;
+	};
 };
 
 
@@ -280,7 +290,7 @@
 			pins =  "gpio55", "gpio56", "gpio57",
 				"gpio60", "gpio62", "gpio63",
 				"gpio64", "gpio65", "gpio66",
-				"gpio67", "gpio68", "gpio69";
+				"gpio67", "gpio69";
 			function = "qpic";
 			bias-pull-down;
 		};