kernel-agent/patches/board/coolpi-cm5-genbook/0005-arm64-dts-rockchip-rk3588-coolpi-cm5-genbook-Enable-USB-C-PD-charging-via-FUSB302.patch

From: Markus Fritsche <mfritsche@localhost>
Date: Tue, 24 Mar 2026 00:00:00 +0000
Subject: [PATCH] arm64: dts: rockchip: rk3588-coolpi-cm5-genbook: add USB-C PD charging

The GenBook carrier board exposes a USB Type-C port driven by the
RK3588 USB3OTG0 controller (usb_host0_xhci / usbdp_phy0 combo).  The
port uses a Fairchild FUSB302 (I²C address 0x22, bus i2c4) for USB
Power Delivery negotiation.  Hardware signals:

  GPIO0_PD5 – FUSB302 interrupt (active-low, shared with CC logic)
  GPIO0_PA0 – VBUS switch enable (active-high)

Without these changes the kernel registers usb_host0_xhci in
peripheral-only, high-speed mode, which prevents PD negotiation and
leaves the port unable to charge the battery.

Changes:

* Add #include <dt-bindings/usb/pd.h> for PDO_FIXED macros.

* Add vcc5v0_otg regulator: GPIO0_PA0 active-high switch that gates
  VBUS; used as vbus-supply for the FUSB302 and connected via the new
  typec5v_pwren pinctrl entry.  The previously defined but unreferenced
  usb_otg_pwren entry (same pin, wrong pull direction) is removed.

* Add usbc0 (FUSB302) node inside &i2c4:
  - compatible "fcs,fusb302", reg 0x22
  - interrupt GPIO0_PD5 (IRQ_TYPE_LEVEL_LOW), pinctrl usbc0_int
  - usb-c-connector child with:
      data-role / power-role "dual", try-power-role "sink"
      pd-revision 2.0 Ver 1.2 (maximum supported by FUSB302)
      sink-pdos: 5 V/3 A, 9 V/3 A, 12 V/3 A, 15 V/3 A
      source-pdos: 5 V/3 A
      DisplayPort alt-mode (SVID 0xff01) declared for orientation
      switching; three connector ports linking HS (→ usb_host0_xhci),
      SS (→ usbdp_phy0) and SBU (→ usbdp_phy0) endpoints.

* Expand &usbdp_phy0 to add mode-switch and orientation-switch
  capabilities; register endpoint@0 (SS, linked to usbc0_ss) and
  endpoint@1 (SBU, linked to usbc0_sbu).

* Replace the &usb_host0_xhci override:
  - remove dr_mode "peripheral" and maximum-speed "high-speed"
    (the base DTSI already sets dr_mode "otg")
  - add usb-role-switch and the port endpoint linked to usbc0_hs
  This allows the TCPM stack to switch the controller between host
  and device role as the PD contract dictates.

* Add pinctrl group usb-typec with:
  - usbc0_int: GPIO0_PD5 pull-up (FUSB302 /INT)
  - typec5v_pwren: GPIO0_PA0 pull-down (VBUS switch, default off)

DAPM / power flow:
  USB-C charger → FUSB302 CC negotiation → TCPM requests VBUS →
  vcc5v0_otg regulator enables GPIO0_PA0 → VBUS present on port →
  DWC3 OTG detects VBUS, enters device/host mode per PD data-role.

Generated-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Markus Fritsche <mfritsche@localhost>
---
 1 file changed, 106 insertions(+), 6 deletions(-)

--- a/arch/arm64/boot/dts/rockchip/rk3588-coolpi-cm5-genbook.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-coolpi-cm5-genbook.dts
@@ -8,6 +8,7 @@
 
 #include <dt-bindings/leds/common.h>
 #include <dt-bindings/soc/rockchip,vop2.h>
+#include <dt-bindings/usb/pd.h>
 #include "rk3588-coolpi-cm5.dtsi"
 
 / {
@@ -153,6 +154,18 @@
 		pinctrl-0 = <&usb_host_pwren>;
 		vin-supply = <&vcc5v0_usb>;
 	};
+
+	vcc5v0_otg: regulator-vcc5v0-otg {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc5v0_otg";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		enable-active-high;
+		gpio = <&gpio0 RK_PA0 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&typec5v_pwren>;
+		vin-supply = <&vcc5v0_sys>;
+	};
 };
 
 &edp1 {
@@ -239,6 +252,65 @@
 		monitored-battery = <&battery>;
 		power-supplies = <&charger>;
 	};
+
+	usbc0: usb-typec@22 {
+		compatible = "fcs,fusb302";
+		reg = <0x22>;
+		interrupt-parent = <&gpio0>;
+		interrupts = <RK_PD5 IRQ_TYPE_LEVEL_LOW>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&usbc0_int>;
+		vbus-supply = <&vcc5v0_otg>;
+
+		usb_con: connector {
+			compatible = "usb-c-connector";
+			label = "USB-C";
+			data-role = "dual";
+			power-role = "dual";
+			try-power-role = "sink";
+			op-sink-microwatt = <1000000>;
+			/* FUSB302 supports PD Rev 2.0 Ver 1.2 */
+			pd-revision = /bits/ 8 <0x2 0x0 0x1 0x2>;
+			sink-pdos = <PDO_FIXED(5000, 3000, PDO_FIXED_USB_COMM)>,
+				    <PDO_FIXED(9000, 3000, PDO_FIXED_USB_COMM)>,
+				    <PDO_FIXED(12000, 3000, PDO_FIXED_USB_COMM)>,
+				    <PDO_FIXED(15000, 3000, PDO_FIXED_USB_COMM)>;
+			source-pdos = <PDO_FIXED(5000, 3000, PDO_FIXED_USB_COMM)>;
+
+			altmodes {
+				displayport {
+					svid = /bits/ 16 <0xff01>;
+					vdo = <0xffffffff>;
+				};
+			};
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+					usbc0_hs: endpoint {
+						remote-endpoint = <&usb_host0_xhci_to_usbc0>;
+					};
+				};
+
+				port@1 {
+					reg = <1>;
+					usbc0_ss: endpoint {
+						remote-endpoint = <&usbdp_phy0_ss>;
+					};
+				};
+
+				port@2 {
+					reg = <2>;
+					usbc0_sbu: endpoint {
+						remote-endpoint = <&usbdp_phy0_sbu>;
+					};
+				};
+			};
+		};
+	};
 };
 
 &i2c5 {
@@ -323,15 +395,21 @@
 			rockchip,pins = <1 RK_PD5 RK_FUNC_GPIO &pcfg_pull_up>;
 		};
 
-		usb_otg_pwren: usb-otg-pwren {
-			rockchip,pins = <0 RK_PA0 RK_FUNC_GPIO &pcfg_pull_up>;
-		};
-
 		usb_host_pwren: usb-host-pwren {
 			rockchip,pins = <1 RK_PA7 RK_FUNC_GPIO &pcfg_pull_up>;
 		};
 	};
 
+	usb-typec {
+		usbc0_int: usbc0-int {
+			rockchip,pins = <0 RK_PD5 RK_FUNC_GPIO &pcfg_pull_up>;
+		};
+
+		typec5v_pwren: typec5v-pwren {
+			rockchip,pins = <0 RK_PA0 RK_FUNC_GPIO &pcfg_pull_down>;
+		};
+	};
+
 	wifi {
 		bt_pwron: bt-pwron {
 			rockchip,pins = <3 RK_PA6 RK_FUNC_GPIO &pcfg_pull_up>;
@@ -387,7 +465,24 @@
 };
 
 &usbdp_phy0 {
+	mode-switch;
+	orientation-switch;
 	status = "okay";
+
+	port {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		usbdp_phy0_ss: endpoint@0 {
+			reg = <0>;
+			remote-endpoint = <&usbc0_ss>;
+		};
+
+		usbdp_phy0_sbu: endpoint@1 {
+			reg = <1>;
+			remote-endpoint = <&usbc0_sbu>;
+		};
+	};
 };
 
 &u2phy1 {
@@ -431,9 +526,14 @@
 
 /* Type C port */
 &usb_host0_xhci {
-	dr_mode = "peripheral";
-	maximum-speed = "high-speed";
+	usb-role-switch;
 	status = "okay";
+
+	port {
+		usb_host0_xhci_to_usbc0: endpoint {
+			remote-endpoint = <&usbc0_hs>;
+		};
+	};
 };
 
 /* connected to a HUB for camera and BT */