ARM: dts: ux500: samsung-golden: Add WiFi

samsung-golden uses a BCM4334 WiFi+BT combo chip, connected to SDIO.
It is supported by the brcmfmac driver in mainline,
so we only need to set up the device tree to make it work correctly.

Note: brcmfmac requires (proprietary) firmware + a device-specific
NVRAM file. Both can be extracted from the stock Android system
used on samsung-golden:
  - /system/etc/wifi/bcmdhd_sta.bin_b2   -> /lib/firmware/brcm/brcmfmac4334-sdio.bin
  - /system/etc/wifi/nvram_net.txt_GPIO4 -> /lib/firmware/brcm/brcmfmac4334-sdio.samsung,golden.txt

brcmfmac4334-sdio.bin from linux-firmware also seems to work,
but results in occasional errors for some reason.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20191219202052.19039-8-stephan@gerhold.netSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/ste-ux500-samsung-golden.dts

@@ -64,9 +64,27 @@ sdi1_per2@80118000 {
 			non-removable;
 			cap-sd-highspeed;
 
+			vmmc-supply = <&wl_reg_on>;
+
 			pinctrl-names = "default", "sleep";
 			pinctrl-0 = <&mc1_a_2_default>;
 			pinctrl-1 = <&mc1_a_2_sleep>;
+
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			wifi@1 {
+				compatible = "brcm,bcm4329-fmac";
+				reg = <1>;
+
+				/* GPIO216 (WLAN_HOST_WAKE) */
+				interrupt-parent = <&gpio6>;
+				interrupts = <24 IRQ_TYPE_EDGE_FALLING>;
+				interrupt-names = "host-wake";
+
+				pinctrl-names = "default";
+				pinctrl-0 = <&wlan_default>;
+			};
 		};
 
 		/* eMMC */
@@ -290,6 +308,28 @@ sd_level_translator: regulator-sd-level-translator {
 		pinctrl-names = "default";
 		pinctrl-0 = <&sd_level_translator_default>;
 	};
+
+	/*
+	 * WL_REG_ON takes WLAN out of reset and enables the internal regulators.
+	 * The voltage specified here is only used to determine the OCR mask,
+	 * the BCM chip is actually connected directly to VBAT.
+	 */
+	wl_reg_on: regulator-wl-reg-on {
+		compatible = "regulator-fixed";
+
+		regulator-name = "wl-reg-on";
+		regulator-min-microvolt = <3000000>;
+		regulator-max-microvolt = <3000000>;
+
+		startup-delay-us = <100000>;
+
+		/* GPIO215 (WLAN_EN) */
+		gpio = <&gpio6 23 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&wlan_en_default>;
+	};
 };
 
 &pinctrl {
@@ -340,6 +380,22 @@ golden_cfg1 {
 		};
 	};
 
+	wlan {
+		wlan_default: wlan_default {
+			golden_cfg1 {
+				pins = "GPIO216_AG12";	/* WLAN_HOST_WAKE */
+				ste,config = <&gpio_in_pd>;
+			};
+		};
+
+		wlan_en_default: wlan_en_default {
+			golden_cfg1 {
+				pins = "GPIO215_AH13";	/* WLAN_EN */
+				ste,config = <&gpio_out_lo>;
+			};
+		};
+	};
+
 	vibrator {
 		vibrator_default: vibrator_default {
 			golden_cfg1 {