MIPS: Add basic support for the TL-WR1043ND version 1

Add a DTS for TL-WR1043ND version 1 and allow to have it built in the
kernel to circumvent the broken u-boot found on these boards.
Currently only the UART, LEDs and buttons are supported.

Signed-off-by: Alban Bedel <[e-mail]>
Cc: [e-mail]
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/ath79/Kconfig

···
 	  Say 'Y' here if you want your kernel to support the
 	  Ubiquiti Networks XM (rev 1.0) board.
 
+choice
+	prompt "Build a DTB in the kernel"
+	optional
+	help
+	  Select a devicetree that should be built into the kernel.
+
+	config DTB_TL_WR1043ND_V1
+		bool "TL-WR1043ND Version 1"
+		select BUILTIN_DTB
+		select SOC_AR913X
+endchoice
+
 endmenu
 
 config SOC_AR71XX

arch/mips/boot/dts/Makefile

···
 dts-dirs	+= lantiq
 dts-dirs	+= mti
 dts-dirs	+= netlogic
+dts-dirs	+= qca
 dts-dirs	+= ralink
 
 obj-y		:= $(addsuffix /, $(dts-dirs))

arch/mips/boot/dts/qca/Makefile

···
+# All DTBs
+dtb-$(CONFIG_ATH79)			+= ar9132_tl_wr1043nd_v1.dtb
+
+# Select a DTB to build in the kernel
+obj-$(CONFIG_DTB_TL_WR1043ND_V1)	+= ar9132_tl_wr1043nd_v1.dtb.o
+
+# Force kbuild to make empty built-in.o if necessary
+obj-				+= dummy.o
+
+always				:= $(dtb-y)
+clean-files			:= *.dtb *.dtb.S

arch/mips/boot/dts/qca/ar9132.dtsi

···
+/ {
+	compatible = "qca,ar9132";
+
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "mips,mips24Kc";
+			reg = <0>;
+		};
+	};
+
+	cpuintc: interrupt-controller {
+		compatible = "qca,ar9132-cpu-intc", "qca,ar7100-cpu-intc";
+
+		interrupt-controller;
+		#interrupt-cells = <1>;
+
+		qca,ddr-wb-channel-interrupts = <2>, <3>, <4>, <5>;
+		qca,ddr-wb-channels = <&ddr_ctrl 3>, <&ddr_ctrl 2>,
+					<&ddr_ctrl 0>, <&ddr_ctrl 1>;
+	};
+
+	ahb {
+		compatible = "simple-bus";
+		ranges;
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		interrupt-parent = <&cpuintc>;
+
+		apb {
+			compatible = "simple-bus";
+			ranges;
+
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			interrupt-parent = <&miscintc>;
+
+			ddr_ctrl: memory-controller@18000000 {
+				compatible = "qca,ar9132-ddr-controller",
+						"qca,ar7240-ddr-controller";
+				reg = <0x18000000 0x100>;
+
+				#qca,ddr-wb-channel-cells = <1>;
+			};
+
+			uart@18020000 {
+				compatible = "ns8250";
+				reg = <0x18020000 0x20>;
+				interrupts = <3>;
+
+				clocks = <&pll 2>;
+				clock-names = "uart";
+
+				reg-io-width = <4>;
+				reg-shift = <2>;
+				no-loopback-test;
+
+				status = "disabled";
+			};
+
+			gpio: gpio@18040000 {
+				compatible = "qca,ar9132-gpio",
+						"qca,ar7100-gpio";
+				reg = <0x18040000 0x30>;
+				interrupts = <2>;
+
+				ngpios = <22>;
+
+				gpio-controller;
+				#gpio-cells = <2>;
+
+				interrupt-controller;
+				#interrupt-cells = <2>;
+			};
+
+			pll: pll-controller@18050000 {
+				compatible = "qca,ar9132-ppl",
+						"qca,ar9130-pll";
+				reg = <0x18050000 0x20>;
+
+				clock-names = "ref";
+				/* The board must provides the ref clock */
+
+				#clock-cells = <1>;
+				clock-output-names = "cpu", "ddr", "ahb";
+			};
+
+			wdt@18060008 {
+				compatible = "qca,ar7130-wdt";
+				reg = <0x18060008 0x8>;
+
+				interrupts = <4>;
+
+				clocks = <&pll 2>;
+				clock-names = "wdt";
+			};
+
+			miscintc: interrupt-controller@18060010 {
+				compatible = "qca,ar9132-misc-intc",
+					   "qca,ar7100-misc-intc";
+				reg = <0x18060010 0x4>;
+
+				interrupt-parent = <&cpuintc>;
+				interrupts = <6>;
+
+				interrupt-controller;
+				#interrupt-cells = <1>;
+			};
+		};
+
+		spi@1f000000 {
+			compatible = "qca,ar9132-spi", "qca,ar7100-spi";
+			reg = <0x1f000000 0x10>;
+
+			clocks = <&pll 2>;
+			clock-names = "ahb";
+
+			status = "disabled";
+
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};

arch/mips/boot/dts/qca/ar9132_tl_wr1043nd_v1.dts

···
+/dts-v1/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "ar9132.dtsi"
+
+/ {
+	compatible = "tplink,tl-wr1043nd-v1", "qca,ar9132";
+	model = "TP-Link TL-WR1043ND Version 1";
+
+	alias {
+		serial0 = "/ahb/apb/uart@18020000";
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x2000000>;
+	};
+
+	extosc: oscillator {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <40000000>;
+	};
+
+	ahb {
+		apb {
+			uart@18020000 {
+				status = "okay";
+			};
+
+			pll-controller@18050000 {
+				clocks = <&extosc>;
+			};
+		};
+
+		spi@1f000000 {
+			status = "okay";
+			num-cs = <1>;
+
+			flash@0 {
+				#address-cells = <1>;
+				#size-cells = <1>;
+				compatible = "s25sl064a";
+				reg = <0>;
+				spi-max-frequency = <25000000>;
+
+				partition@0 {
+					label = "u-boot";
+					reg = <0x000000 0x020000>;
+				};
+
+				partition@1 {
+					label = "firmware";
+					reg = <0x020000 0x7D0000>;
+				};
+
+				partition@2 {
+					label = "art";
+					reg = <0x7F0000 0x010000>;
+					read-only;
+				};
+			};
+		};
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys-polled";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		poll-interval = <20>;
+		button@0 {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+
+		button@1 {
+			label = "qss";
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&gpio 7 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led@0 {
+			label = "tp-link:green:usb";
+			gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+		};
+
+		led@1 {
+			label = "tp-link:green:system";
+			gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "heartbeat";
+		};
+
+		led@2 {
+			label = "tp-link:green:qss";
+			gpios = <&gpio 5 GPIO_ACTIVE_HIGH>;
+		};
+
+		led@3 {
+			label = "tp-link:green:wlan";
+			gpios = <&gpio 9 GPIO_ACTIVE_LOW>;
+		};
+	};
+};