[openwrt/openwrt] ramips: dts: mt7621: add the missing XHCI power regulators

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/51b77a32980324601d0b2721bd9999d78e09d808

commit 51b77a32980324601d0b2721bd9999d78e09d808
Author: Shiji Yang <yangshiji66 at outlook.com>
AuthorDate: Tue May 20 07:50:56 2025 +0800

    ramips: dts: mt7621: add the missing XHCI power regulators
    
    The USB power regulators are essential for the Mediatek XHCI
    controller. If any of them is missing, the kernel will throw
    a warning. Add fixed voltage io/vbus regulators to workaround
    this issue. Fix the following warnings:
    
    [    7.514572] xhci-mtk 1e1c0000.xhci: supply vbus not found, using dummy regulator
    [    7.522375] xhci-mtk 1e1c0000.xhci: supply vusb33 not found, using dummy regulator
    
    Signed-off-by: Shiji Yang <yangshiji66 at outlook.com>
    Link: https://github.com/openwrt/openwrt/pull/18886
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 target/linux/ramips/dts/mt7621.dtsi | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/target/linux/ramips/dts/mt7621.dtsi b/target/linux/ramips/dts/mt7621.dtsi
index da992bada4..711f84689f 100644
--- a/target/linux/ramips/dts/mt7621.dtsi
+++ b/target/linux/ramips/dts/mt7621.dtsi
@@ -64,6 +64,22 @@
 		regulator-name = "mmc_power";
 	};
 
+	reg_vbus: regulator-vbus {
+		compatible = "regulator-fixed";
+		regulator-always-on;
+		regulator-max-microvolt = <5000000>;
+		regulator-min-microvolt = <5000000>;
+		regulator-name = "usb_power";
+	};
+
+	reg_vusb33: regulator-vusb33 {
+		compatible = "regulator-fixed";
+		regulator-always-on;
+		regulator-max-microvolt = <3300000>;
+		regulator-min-microvolt = <3300000>;
+		regulator-name = "usb_io";
+	};
+
 	palmbus: palmbus at 1e000000 {
 		compatible = "palmbus";
 		reg = <0x1e000000 0x100000>;
@@ -395,6 +411,9 @@
 		interrupt-parent = <&gic>;
 		interrupts = <GIC_SHARED 22 IRQ_TYPE_LEVEL_HIGH>;
 
+		vbus-supply = <&reg_vbus>;
+		vusb33-supply = <&reg_vusb33>;
+
 		/*
 		 * Port 1 of both hubs is one usb slot and referenced here.
 		 * The binding doesn't allow to address individual hubs.