[PATCH v2] arm64: dts: rockchip: rk3588-nanopc-t6: fix usb-c port functionality

[John Clark <inindev@gmail.com>]

The USB-C port on the NanoPC-T6 was not providing VBUS (vbus5v0_typec
regulator disabled, gpio-58 out lo) due to misconfiguration. The
original setup with regulator-always-on and regulator-boot-on forced
the port on, masking the issue, but removing these properties revealed
that the fusb302 driver was not enabling the regulator dynamically.

Changes:
- Removed regulator-always-on and regulator-boot-on from vbus5v0_typec
  and vbus5v0_usb to allow driver control.
- Changed power-role from "source" to "dual" in the usb-c-connector to
  support OTG functionality.
- Added pd-revision = /bits/ 8 <0x2 0x0 0x1 0x2> to the FUSB302MPX
  node to specify USB Power Delivery (PD) Revision 2.0, Version 1.2,
  ensuring the driver correctly advertises PD capabilities and
  negotiates power roles (source/sink).
- Added op-sink-microwatt and sink-pdos for proper sink mode
  configuration (1W min, 15W max).
- Added typec-power-opmode = "1.5A" to enable 1.5A fallback for non-PD
  USB-C devices, aligning with the 5V/2A hardware limit.
- Set try-power-role to "source" to prioritize VBUS enablement.
- Adjusted usb_host0_xhci dr_mode from "host" to "otg" and added
  usb-role-switch for dual-role support.

Testing:
- Verified VBUS (5V) delivery to a sink device (USB thumb drive).
- Confirmed USB host mode with lsusb detecting connected devices.
- Validated USB device mode with adb devices when connected to a PC.
- Tested dual-role (OTG) functionality with try-power-role set to
  "source" and "sink"; "source" prioritizes faster VBUS activation.
- Validated functionality with a mobile device, including USB Power
  Delivery, file transfer, USB tethering, MIDI, and image transfer.
- Tested USB-C Ethernet adapter compatibility in host mode.
- Tested USB-C hub compatibility in host mode.

Signed-off-by: John Clark <inindev@gmail.com>

---
Changes in v2:
- Changed typec-power-opmode from "3.0A" to "1.5A" to conservatively
  align with the 5V/2A hardware limit, addressing feedback from Hugh
  Cole-Baker.
---
 .../boot/dts/rockchip/rk3588-nanopc-t6.dtsi   | 21 ++++++++++---------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi b/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
index cecfb788b..3d8b6f0c5 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
@@ -174,8 +174,6 @@ vbus5v0_typec: regulator-vbus5v0-typec {
 		gpio = <&gpio1 RK_PD2 GPIO_ACTIVE_HIGH>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&typec5v_pwren>;
-		regulator-always-on;
-		regulator-boot-on;
 		regulator-name = "vbus5v0_typec";
 		regulator-min-microvolt = <5000000>;
 		regulator-max-microvolt = <5000000>;
@@ -188,8 +186,6 @@ vbus5v0_usb: regulator-vbus5v0-usb {
 		gpio = <&gpio4 RK_PB0 GPIO_ACTIVE_HIGH>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&usb5v_pwren>;
-		regulator-always-on;
-		regulator-boot-on;
 		regulator-name = "vbus5v0_usb";
 		regulator-min-microvolt = <5000000>;
 		regulator-max-microvolt = <5000000>;
@@ -465,24 +461,30 @@ regulator-state-mem {
 };
 
 &i2c6 {
-	clock-frequency = <200000>;
 	status = "okay";
 
-	fusb302: typec-portc@22 {
+	usbc0: usb-typec@22 {
 		compatible = "fcs,fusb302";
 		reg = <0x22>;
 		interrupt-parent = <&gpio0>;
 		interrupts = <RK_PD3 IRQ_TYPE_LEVEL_LOW>;
-		pinctrl-0 = <&usbc0_int>;
 		pinctrl-names = "default";
+		pinctrl-0 = <&usbc0_int>;
 		vbus-supply = <&vbus5v0_typec>;
+		status = "okay";
 
 		connector {
 			compatible = "usb-c-connector";
 			data-role = "dual";
 			label = "USB-C";
-			power-role = "source";
+			op-sink-microwatt = <1000000>;
+			/* fusb302 supports PD Rev 2.0 Ver 1.2 */
+			pd-revision = /bits/ 8 <0x2 0x0 0x1 0x2>;
+			power-role = "dual";
+			sink-pdos = <PDO_FIXED(5000, 3000, PDO_FIXED_USB_COMM)>;
 			source-pdos = <PDO_FIXED(5000, 2000, PDO_FIXED_USB_COMM)>;
+			try-power-role = "source";
+			typec-power-opmode = "1.5A";
 
 			ports {
 				#address-cells = <1>;
@@ -1135,9 +1137,8 @@ &usb_host0_ohci {
 };
 
 &usb_host0_xhci {
-	dr_mode = "host";
-	status = "okay";
 	usb-role-switch;
+	status = "okay";
 
 	port {
 		usb_host0_xhci_drd_sw: endpoint {
-- 
2.39.5


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