linux-kernel - [PATCH] arm64: dts: rockchip: fix rk3399-puma-haikou USB OTG mode

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Date:   Thu, 20 Jan 2022 13:51:56 +0100
From:   quentin.schulz@...obroma-systems.com
To:     robh+dt@...nel.org, heiko@...ech.de
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Quentin Schulz <quentin.schulz@...obroma-systems.com>,
        Quentin Schulz <foss+kernel@...il.net>
Subject: [PATCH] arm64: dts: rockchip: fix rk3399-puma-haikou USB OTG mode

From: Quentin Schulz <quentin.schulz@...obroma-systems.com>

The micro USB3.0 port available on the Haikou evaluation kit for Puma
RK3399-Q7 SoM supports dual-role model (aka drd or OTG) but its support
was broken until now because of missing logic around the ID pin.

This adds proper support for USB OTG on Puma Haikou by "connecting" the
GPIO used for USB ID to the USB3 controller device.

Cc: Quentin Schulz <foss+kernel@...il.net>
Signed-off-by: Quentin Schulz <quentin.schulz@...obroma-systems.com>
---
 .../arm64/boot/dts/rockchip/rk3399-puma-haikou.dts |  1 +
 arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi      | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts b/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts
index 292bb7e80cf3..2564ef28d256 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts
@@ -231,6 +231,7 @@ &usbdrd3_0 {
 };
 
 &usbdrd_dwc3_0 {
+	extcon = <&extcon_usb3>;
 	dr_mode = "otg";
 	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
index fb67db4619ea..c9a563ae3cfd 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
@@ -32,6 +32,13 @@ clkin_gmac: external-gmac-clock {
 		#clock-cells = <0>;
 	};
 
+	extcon_usb3: extcon-usb3 {
+		compatible = "linux,extcon-usb-gpio";
+		id-gpio = <&gpio1 RK_PC2 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&usb3_id>;
+	};
+
 	vcc1v2_phy: vcc1v2-phy {
 		compatible = "regulator-fixed";
 		regulator-name = "vcc1v2_phy";
@@ -422,6 +429,13 @@ vcc5v0_host_en: vcc5v0-host-en {
 			  <4 RK_PA3 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
 	};
+
+	usb3 {
+		usb3_id: usb3-id {
+			rockchip,pins =
+			  <1 RK_PC2 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
 };
 
 &sdhci {
-- 
2.34.1