ARM: dts: sun8i-q8-common: Add support for SDIO wifi controllers

Most of the sun8i q8 boards have an SDIO wifi controller, on the
variants which use an USB wifi controller, this will result in a
couple of error msg-s in dmesg when proving the sdio bus and
an used mmc controller.

The best way to deal with wifi on this boards really is to simply
let the kernel auto-detect usb or sdio wifi controllers, so we
will just have to live with the few errors in dmesg.

This has been tested on a23 based q8 tablets with ESP8089, RTL8703AS and
RTL8189FTV wifi controllers.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun8i-q8-common.dtsi

@@ -42,10 +42,59 @@
 #include "sunxi-reference-design-tablet.dtsi"
 #include "sun8i-reference-design-tablet.dtsi"
 
+/ {
+	aliases {
+		serial0 = &r_uart;
+		/* Make u-boot set mac-address for wifi without an eeprom */
+		ethernet0 = &sdio_wifi;
+	};
+
+	wifi_pwrseq: wifi_pwrseq {
+		compatible = "mmc-pwrseq-simple";
+		/*
+		 * Q8 boards use various PL# pins as wifi-en. On other boards
+		 * these may be connected to a wifi module output pin. To avoid
+		 * short-circuits we configure these as inputs with pull-ups via
+		 * pinctrl, instead of listing them as active-low reset-gpios.
+		 */
+		pinctrl-names = "default";
+		pinctrl-0 = <&wifi_pwrseq_pin_q8>;
+		/* The esp8089 needs 200 ms after driving wifi-en high */
+		post-power-on-delay-ms = <200>;
+	};
+};
+
 &ehci0 {
 	status  = "okay";
 };
 
+&mmc1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&mmc1_pins_a>;
+	vmmc-supply = <&reg_dldo1>;
+	mmc-pwrseq = <&wifi_pwrseq>;
+	bus-width = <4>;
+	non-removable;
+	status = "okay";
+
+	sdio_wifi: sdio_wifi@1 {
+		reg = <1>;
+	};
+};
+
+&mmc1_pins_a {
+	allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
+};
+
+&r_pio {
+	wifi_pwrseq_pin_q8: wifi_pwrseq_pin@0 {
+		allwinner,pins = "PL6", "PL7", "PL11";
+		allwinner,function = "gpio_in";
+		allwinner,drive = <SUN4I_PINCTRL_10_MA>;
+		allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
+	};
+};
+
 &usbphy {
 	usb1_vbus-supply = <&reg_dldo1>;
 };