ARM: dts: dra7-evm: Add wilink8 wlan support

The wilink module is a combo wireless connectivity sdio
card based on Texas Instrument's wl18xx solution. It is a
4-wire, 1.8V, embedded sdio wlan device with an external
irq line and is power-controlled by a gpio-based fixed
regulator.

Add pinmux configuration and IODelay values for MMC4.
On dra7-evm, MMC4 is used for connecting to wilink module.

IODelay data credits to :  Vishal Mahaveer <vishalm@ti.com>
and Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Eyal Reizer <eyalr@ti.com>
Signed-off-by: Hari Nagalla <hnagalla@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/dra7-evm-common.dtsi

@@ -260,3 +260,18 @@ mbox_dsp2_ipc3x: mbox_dsp2_ipc3x {
 &pcie1_rc {
 	status = "okay";
 };
+
+&mmc4 {
+	bus-width = <4>;
+	cap-power-off-card;
+	keep-power-in-suspend;
+	non-removable;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	wifi@2 {
+		compatible = "ti,wl1835";
+		reg = <2>;
+		interrupt-parent = <&gpio5>;
+		interrupts = <7 IRQ_TYPE_EDGE_RISING>;
+	};
+};

arch/arm/boot/dts/dra7-evm.dts

@@ -96,6 +96,16 @@ evm_3v6: fixedregulator-evm_3v6 {
 		regulator-boot-on;
 	};
 
+	vmmcwl_fixed: fixedregulator-mmcwl {
+		compatible = "regulator-fixed";
+		regulator-name = "vmmcwl_fixed";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		gpio = <&gpio5 8 0>;
+		startup-delay-us = <70000>;
+		enable-active-high;
+	};
+
 	extcon_usb2: extcon_usb2 {
 		compatible = "linux,extcon-usb-gpio";
 		id-gpio = <&pcf_gpio_21 2 GPIO_ACTIVE_HIGH>;
@@ -376,6 +386,21 @@ &mmc2 {
 	pinctrl-5 = <&mmc2_pins_hs200 &mmc2_iodelay_hs200_rev20_conf>;
 };
 
+&mmc4 {
+	status = "okay";
+	vmmc-supply = <&evm_3v6>;
+	vqmmc-supply = <&vmmcwl_fixed>;
+	pinctrl-names = "default-rev11", "default", "hs-rev11", "hs", "sdr12-rev11", "sdr12", "sdr25-rev11", "sdr25";
+	pinctrl-0 = <&mmc4_pins_default &mmc4_iodelay_ds_rev11_conf>;
+	pinctrl-1 = <&mmc4_pins_default &mmc4_iodelay_ds_rev20_conf>;
+	pinctrl-2 = <&mmc4_pins_hs &mmc4_iodelay_sdr12_hs_sdr25_rev11_conf>;
+	pinctrl-3 = <&mmc4_pins_hs &mmc4_iodelay_sdr12_hs_sdr25_rev20_conf>;
+	pinctrl-4 = <&mmc4_pins_sdr12 &mmc4_iodelay_sdr12_hs_sdr25_rev11_conf>;
+	pinctrl-5 = <&mmc4_pins_sdr12 &mmc4_iodelay_sdr12_hs_sdr25_rev20_conf>;
+	pinctrl-6 = <&mmc4_pins_sdr25 &mmc4_iodelay_sdr12_hs_sdr25_rev11_conf>;
+	pinctrl-7 = <&mmc4_pins_sdr25 &mmc4_iodelay_sdr12_hs_sdr25_rev20_conf>;
+};
+
 &cpu0 {
 	vdd-supply = <&smps123_reg>;
 };