ARM: dts: BCM5301X: Add support for Buffalo WXR-1750DHP

Add initial device tree support for the Buffalo WXR-1750DHP, a consumer Wi-Fi
router based on the Broadcom BCM4708A0 SoC.

Hardware specifications:
* Processor: Broadcom BCM4708A0 dual-core @ 800 MHz
* RAM: DDR3 256 MB
* Ethernet Switch: Broadcom BCM53011 integrated via SRAB
* NAND Flash: 128 MB (8-bit ECC)
* SPI Flash: None
* Ports: 4 LAN Ports, 1 WAN Port
* USB: 1x USB 3.0 Type-A port

Signed-off-by: Taishi Shimizu <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Florian Fainelli <[e-mail]>

arch/arm/boot/dts/broadcom/Makefile

···
 dtb-$(CONFIG_ARCH_BCM_5301X) += \
 	bcm4708-asus-rt-ac56u.dtb \
 	bcm4708-asus-rt-ac68u.dtb \
+	bcm4708-buffalo-wxr-1750dhp.dtb \
 	bcm4708-buffalo-wzr-1750dhp.dtb \
 	bcm4708-buffalo-wzr-1166dhp.dtb \
 	bcm4708-buffalo-wzr-1166dhp2.dtb \

arch/arm/boot/dts/broadcom/bcm4708-buffalo-wxr-1750dhp.dts

···
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Author: Taishi Shimizu <[e-mail]>
+ */
+
+/dts-v1/;
+
+#include "bcm4708.dtsi"
+#include "bcm5301x-nand-cs0-bch8.dtsi"
+#include <dt-bindings/leds/common.h>
+
+/ {
+	compatible = "buffalo,wxr-1750dhp", "brcm,bcm4708";
+	model = "Buffalo WXR-1750DHP";
+
+	memory@0 {
+		reg = <0x00000000 0x08000000>,
+		      <0x88000000 0x08000000>;
+		device_type = "memory";
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		button-aoss {
+			gpios = <&chipcommon 2 GPIO_ACTIVE_LOW>;
+			label = "AOSS";
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+
+		/* GPIO 3 is a switch button with AUTO / MANUAL. */
+		button-manual {
+			gpios = <&chipcommon 3 GPIO_ACTIVE_HIGH>;
+			label = "MANUAL";
+			linux,code = <BTN_0>;
+			linux,input-type = <EV_SW>;
+		};
+
+		button-restart {
+			gpios = <&chipcommon 11 GPIO_ACTIVE_LOW>;
+			label = "Reset";
+			linux,code = <KEY_RESTART>;
+		};
+
+		/* GPIO 8 and 9 are a tri-state switch button with
+		 * ROUTER / AP / WB.
+		 */
+		button-router {
+			gpios = <&chipcommon 8 GPIO_ACTIVE_LOW>;
+			label = "ROUTER";
+			linux,code = <BTN_1>;
+			linux,input-type = <EV_SW>;
+		};
+
+		button-wb {
+			gpios = <&chipcommon 9 GPIO_ACTIVE_LOW>;
+			label = "WB";
+			linux,code = <BTN_2>;
+			linux,input-type = <EV_SW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led-internet {
+			color = <LED_COLOR_ID_WHITE>;
+			function = "internet";
+			gpios = <&chipcommon 7 GPIO_ACTIVE_HIGH>;
+		};
+
+		led-power0 {
+			color = <LED_COLOR_ID_AMBER>;
+			function = LED_FUNCTION_POWER;
+			gpios = <&chipcommon 6 GPIO_ACTIVE_HIGH>;
+		};
+
+		led-power1 {
+			color = <LED_COLOR_ID_WHITE>;
+			function = LED_FUNCTION_POWER;
+			gpios = <&chipcommon 5 GPIO_ACTIVE_HIGH>;
+		};
+
+		led-router0 {
+			color = <LED_COLOR_ID_AMBER>;
+			function = "router";
+			gpios = <&chipcommon 14 GPIO_ACTIVE_HIGH>;
+		};
+
+		led-router1 {
+			color = <LED_COLOR_ID_WHITE>;
+			function = "router";
+			gpios = <&chipcommon 15 GPIO_ACTIVE_HIGH>;
+		};
+
+		led-usb {
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_USB;
+			gpios = <&chipcommon 4 GPIO_ACTIVE_HIGH>;
+			linux,default-trigger = "usbport";
+			trigger-sources = <&xhci_port1 &ehci_port1 &ohci_port1>;
+		};
+	};
+};
+
+&srab {
+	status = "okay";
+
+	ports {
+		port@0 {
+			label = "wan";
+		};
+
+		port@1 {
+			label = "lan4";
+		};
+
+		port@2 {
+			label = "lan3";
+		};
+
+		port@3 {
+			label = "lan2";
+		};
+
+		port@4 {
+			label = "lan1";
+		};
+	};
+};
+
+&usb3 {
+	vcc-gpio = <&chipcommon 10 GPIO_ACTIVE_HIGH>;
+};
+
+&usb3_phy {
+	status = "okay";
+};