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@collabora.com>
Link: https://lore.kernel.org/r/20250630-rock4d-reg-usb-wifi-v1-3-1057f412d98c@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts b/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
index 87bc9004fca158a01a185210423638d16ccc7865..c2683c2a2f049c6d9d662a459a50ccf06ddb666c 100644 (file)
--- a/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
@@ -37,6 +37,14 @@
                };
        };
 
+       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 @@
                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;
@@ -720,6 +741,15 @@
 
                };
        };
+
+       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 {