linux-kernel - [PATCH 3/3] arm64: dts: rockchip: theoretically enable Wi-Fi on ROCK 4D

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Message-Id: <20250630-rock4d-reg-usb-wifi-v1-3-1057f412d98c@collabora.com>
Date: Mon, 30 Jun 2025 17:36:35 +0200
From: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>
Cc: kernel@...labora.com, devicetree@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, 
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject: [PATCH 3/3] arm64: dts: rockchip: theoretically enable Wi-Fi on
 ROCK 4D

The production version of the ROCK 4D appears to sport a AICSEMI
AIC8800D80 USB Wi-Fi + BT chipset. This chip does not yet have a
mainline driver.

Add the necessary rfkill node and wifi regulator node to at least make
it show up in lsusb output. The regulator is set as always-on, as like 2
hours deep into debugging why onboard_usb_dev.c wouldn't try enabling
the regulator the device needs to actually show up and thus bind to
onboard_usb_dev.c, I decided that it's not worth the effort.

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
---
 arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts | 30 +++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts b/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
index ed8b018539acb77328627c24b88a5a220fe085d2..291b6e4ffdac86280280de49c30de7ddde80462b 100644
--- a/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
@@ -37,6 +37,14 @@ hdmi_con_in: endpoint {
 		};
 	};
 
+	rfkill {
+		compatible = "rfkill-gpio";
+		pinctrl-names = "default";
+		pinctrl-0 = <&wifi_en_h>;
+		radio-type = "wlan";
+		shutdown-gpios = <&gpio2 RK_PD1 GPIO_ACTIVE_HIGH>;
+	};
+
 	leds: leds {
 		compatible = "gpio-leds";
 		pinctrl-names = "default";
@@ -159,6 +167,19 @@ vcc_3v3_ufs_s0: regulator-vcc-ufs-s0 {
 		vin-supply = <&vcc_5v0_sys>;
 	};
 
+	vcc_3v3_wifi: regulator-vcc-3v3-wifi {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpios = <&gpio2 RK_PC7 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&usb_wifi_pwr>;
+		regulator-always-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-name = "vcc_3v3_wifi";
+		vin-supply = <&vcc_3v3_s3>;
+	};
+
 	vcc_5v0_device: regulator-vcc-5v0-device {
 		compatible = "regulator-fixed";
 		regulator-always-on;
@@ -703,6 +724,15 @@ usb_otg_pwren: usb-otg-pwren {
 
 		};
 	};
+
+	wifi {
+		usb_wifi_pwr: usb-wifi-pwr {
+			rockchip,pins = <2 RK_PC7 RK_FUNC_GPIO &pcfg_pull_down>;
+		};
+		wifi_en_h: wifi-en-h {
+			rockchip,pins = <2 RK_PD1 RK_FUNC_GPIO &pcfg_pull_down>;
+		};
+	};
 };
 
 &sdmmc {

-- 
2.50.0