add support for Raspberry Pi Zero W

Signed-off-by: Dmitry Korunov <dessel.k@gmail.com>

arch/arm/dts/bcm2835-rpi-zero-w.dts

@@ -0,0 +1,26 @@
+/dts-v1/;
+#include "bcm2835.dtsi"
+#include "bcm2835-rpi.dtsi"
+#include "bcm283x-rpi-smsc9512.dtsi"
+#include "bcm283x-rpi-usb-host.dtsi"
+
+/ {
+	compatible = "raspberrypi,model-zero-w", "brcm,bcm2835";
+	model = "Raspberry Pi Zero W";
+
+	leds {
+		act {
+			gpios = <&gpio 47 0>;
+		};
+	};
+};
+
+&uart1 {
+    pinctrl-names = "default";
+    pinctrl-0 = <&uart1_gpio14>;
+    status = "okay";
+};
+
+&hdmi {
+	hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
+};

arch/arm/mach-bcm283x/Kconfig

@@ -44,6 +44,22 @@ config TARGET_RPI
 	  This option creates a build targetting the ARM1176 ISA.
 	select BCM2835
 
+config TARGET_RPI_0_W
+	bool "Raspberry Pi Zero W"
+	help
+	  Support for all ARM1176-/BCM2835-based Raspberry Pi variants, such as
+	  the RPi Zero model W.
+
+	  This option assumes the VideoCore firmware is configured to use the
+	  mini UART (rather than PL011) for the serial console. This is the
+	  default on the RPi Zero W. To enable the UART console, the following
+	  non-default option must be present in config.txt: enable_uart=1.
+	  This is required for U-Boot to operate correctly, even if you only
+	  care about the HDMI/usbkbd console.
+
+	  This option creates a build targetting the ARMv7/AArch32 ISA.
+	select BCM2835
+
 config TARGET_RPI_2
 	bool "Raspberry Pi 2"
 	help

board/raspberrypi/rpi/rpi.c

@@ -105,6 +105,11 @@ static const struct rpi_model rpi_models_new_scheme[] = {
 		DTB_DIR "bcm2835-rpi-zero.dtb",
 		false,
 	},
+	[0xC] = {
+		"Zero W",
+		DTB_DIR "bcm2835-rpi-zero-w.dtb",
+		false,
+	},
 };
 
 static const struct rpi_model rpi_models_old_scheme[] = {

configs/rpi_0_w_defconfig

@@ -0,0 +1,28 @@
+CONFIG_ARM=y
+CONFIG_ARCH_BCM283X=y
+CONFIG_TARGET_RPI_0_W=y
+CONFIG_DEFAULT_DEVICE_TREE="bcm2835-rpi-zero-w"
+CONFIG_DISTRO_DEFAULTS=y
+CONFIG_OF_BOARD_SETUP=y
+# CONFIG_DISPLAY_CPUINFO is not set
+# CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_SYS_PROMPT="U-Boot> "
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_FLASH is not set
+CONFIG_CMD_MMC=y
+CONFIG_CMD_USB=y
+# CONFIG_CMD_FPGA is not set
+CONFIG_CMD_GPIO=y
+CONFIG_DM_MMC=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_BCM2835=y
+CONFIG_DM_ETH=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_STORAGE=y
+CONFIG_USB_KEYBOARD=y
+CONFIG_DM_VIDEO=y
+CONFIG_SYS_WHITE_ON_BLACK=y
+CONFIG_CONSOLE_SCROLL_LINES=10
+CONFIG_PHYS_TO_BUS=y
+CONFIG_OF_LIBFDT_OVERLAY=y

include/configs/rpi.h

@@ -76,7 +76,7 @@
 #endif
 
 /* Console UART */
-#ifdef CONFIG_BCM2837
+#if defined (CONFIG_BCM2837) || defined(CONFIG_TARGET_RPI_0_W)
 #define CONFIG_BCM283X_MU_SERIAL
 #else
 #define CONFIG_PL01X_SERIAL