ARM: dts: sun7i: Add basic support for the Cubietruck WiFi module

The CubieTruck has an AMPAK AP6210 WiFi+Bluetooth module. The WiFi
part is a BCM43362 IC connected to MMC3 in the A20 SoC via SDIO.
The IC also takes a power enable signal via GPIO.

The WiFi module supports out-of-band interrupt signaling via GPIO,
but this is not supported in this patch.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20-cubietruck.dts

@@ -29,6 +29,14 @@ mmc0: mmc@01c0f000 {
 			status = "okay";
 		};
 
+		mmc3: mmc@01c12000 {
+			pinctrl-names = "default";
+			pinctrl-0 = <&mmc3_pins_a>;
+			vmmc-supply = <&reg_vmmc3>;
+			non-removable;
+			status = "okay";
+		};
+
 		usbphy: phy@01c13400 {
 			usb1_vbus-supply = <&reg_usb1_vbus>;
 			usb2_vbus-supply = <&reg_usb2_vbus>;
@@ -57,6 +65,18 @@ ohci1: usb@01c1c400 {
 		};
 
 		pinctrl@01c20800 {
+			mmc3_pins_a: mmc3@0 {
+				/* AP6210 requires pull-up */
+				allwinner,pull = <1>;
+			};
+
+			vmmc3_pin_cubietruck: vmmc3_pin@0 {
+				allwinner,pins = "PH9";
+				allwinner,function = "gpio_out";
+				allwinner,drive = <0>;
+				allwinner,pull = <0>;
+			};
+
 			ahci_pwr_pin_cubietruck: ahci_pwr_pin@1 {
 				allwinner,pins = "PH12";
 				allwinner,function = "gpio_out";
@@ -154,4 +174,15 @@ reg_usb1_vbus: usb1-vbus {
 	reg_usb2_vbus: usb2-vbus {
 		status = "okay";
 	};
+
+	reg_vmmc3: vmmc3 {
+		compatible = "regulator-fixed";
+		pinctrl-names = "default";
+		pinctrl-0 = <&vmmc3_pin_cubietruck>;
+		regulator-name = "vmmc3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		enable-active-high;
+		gpio = <&pio 7 9 0>;
+	};
 };