ARM: dts: udoo_neo: Add Wifi support

Udoo Neo has a TI WL1831 Wifi chip connected to the USDHC3 port.

Add support for it.
Signed-off-by: NBreno Lima <breno.lima@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6sx-udoo-neo.dtsi

@@ -97,6 +97,16 @@
 		gpio = <&gpio4 12 GPIO_ACTIVE_HIGH>;
 		enable-active-high;
 	};
+
+	reg_wlan: regulator-wlan {
+		compatible = "regulator-fixed";
+		regulator-name = "wlan-en-regulator";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		gpio = <&gpio2 12 GPIO_ACTIVE_HIGH>;
+		startup-delay-us = <70000>;
+		enable-active-high;
+	};
 };
 
 &cpu0 {
@@ -296,6 +306,19 @@
 			<MX6SX_PAD_SD2_DATA3__USDHC2_DATA3	0x17059>,
 			<MX6SX_PAD_SD1_DATA0__GPIO6_IO_2	0x17059>; /* CD */
 	};
+
+	pinctrl_usdhc3: usdhc3grp {
+		fsl,pins =
+			<MX6SX_PAD_KEY_COL2__GPIO2_IO_12	0x15059>,
+			<MX6SX_PAD_KEY_ROW1__GPIO2_IO_16	0x13059>,
+			<MX6SX_PAD_SD3_DATA0__USDHC3_DATA0	0x17069>,
+			<MX6SX_PAD_SD3_DATA1__USDHC3_DATA1	0x17069>,
+			<MX6SX_PAD_SD3_DATA2__USDHC3_DATA2	0x17069>,
+			<MX6SX_PAD_SD3_DATA3__USDHC3_DATA3	0x17069>,
+			<MX6SX_PAD_SD3_CMD__USDHC3_CMD		0x17069>,
+			<MX6SX_PAD_SD3_CLK__USDHC3_CLK		0x10069>,
+			<MX6SX_PAD_CSI_MCLK__OSC32K_32K_OUT	0x10059>;
+	};
 };
 
 &uart1 {
@@ -351,3 +374,25 @@
 	wakeup-source;
 	status = "okay";
 };
+
+&usdhc3 { /* Wi-Fi */
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_usdhc3>;
+	non-removable;
+	vmmc-supply = <&reg_wlan>;
+	cap-power-off-card;
+	wakeup-source;
+	keep-power-in-suspend;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	wlcore: wlcore@2 {
+		compatible = "ti,wl1831";
+		reg = <2>;
+		interrupt-parent = <&gpio2>;
+		interrupts = <16 IRQ_TYPE_EDGE_RISING>;
+		ref-clock-frequency = <38400000>;
+		tcxo-clock-frequency = <26000000>;
+	};
+};