linux-kernel - [PATCH 4/4] arm64: dts: rockchip: rk3328: Enable USB3 Ethernet on NanoPi R2S

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Date:   Tue,  4 May 2021 16:36:16 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Rob Herring <robh+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>
Cc:     Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] arm64: dts: rockchip: rk3328: Enable USB3 Ethernet on NanoPi R2S

From: Chen-Yu Tsai <wens@...e.org>

The NanoPi R2S has a Realtek RTL8153B USB 3.0 Ethernet chip connected
to the USB 3.0 pins of the RK3328 SoC. Power to the chip is controlled
by a GPIO line toggled transistor switch, which is not a full-blown
voltage regulator.

At least in Linux, the USB 3.0 XHCI controller has two ports: the first
port is for legacy USB 2.0 and slower, while the second port is for USB
3.0. Since the Ethernet chip supports USB 3.0, it should be described
as connected to the second port.

Add the device nodes for the power switch and Ethernet chip, and enable
the USB 3.0 controller. The USB device node follows the standard USB
device binding.

Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 .../boot/dts/rockchip/rk3328-nanopi-r2s.dts   | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3328-nanopi-r2s.dts b/arch/arm64/boot/dts/rockchip/rk3328-nanopi-r2s.dts
index f807bc066ccb..64cf07ee3d10 100644
--- a/arch/arm64/boot/dts/rockchip/rk3328-nanopi-r2s.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3328-nanopi-r2s.dts
@@ -14,6 +14,7 @@ / {
 	compatible = "friendlyarm,nanopi-r2s", "rockchip,rk3328";
 
 	aliases {
+		ethernet1 = &rtl8153;
 		mmc0 = &sdmmc;
 	};
 
@@ -101,6 +102,18 @@ vdd_5v: vdd-5v {
 		regulator-min-microvolt = <5000000>;
 		regulator-max-microvolt = <5000000>;
 	};
+
+	vdd_5v_lan: vdd-5v-lan {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpio = <&gpio2 RK_PC6 GPIO_ACTIVE_HIGH>;
+		pinctrl-0 = <&lan_vdd_pin>;
+		pinctrl-names = "default";
+		regulator-name = "vdd_5v_lan";
+		regulator-always-on;
+		regulator-boot-on;
+		vin-supply = <&vdd_5v>;
+	};
 };
 
 &cpu0 {
@@ -309,6 +322,12 @@ wan_led_pin: wan-led-pin {
 		};
 	};
 
+	lan {
+		lan_vdd_pin: lan-vdd-pin {
+			rockchip,pins = <2 RK_PC6 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	pmic {
 		pmic_int_l: pmic-int-l {
 			rockchip,pins = <1 RK_PD0 RK_FUNC_GPIO &pcfg_pull_up>;
@@ -368,6 +387,19 @@ &usb20_otg {
 	dr_mode = "host";
 };
 
+&usbdrd3 {
+	dr_mode = "host";
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	/* Second port is for USB 3.0 */
+	rtl8153: device@2 {
+		compatible = "usbbda,8153";
+		reg = <2>;
+	};
+};
+
 &usb_host0_ehci {
 	status = "okay";
 };
-- 
2.31.1