kirkwood: add support for ipTIME NAS1

ipTIME NAS1 is a 1-bay NAS, based on Marvell Kirkwood SoC.

Specifications:
* SoC: 88F6281
* RAM: 256 MiB
* Flash: SPI NOR 16 MiB
* SATA: 1x 3Gb/s
* Ethernet: 1x 1GbE
* USB: 1x 2.0
* Fan: 2 speed level
* UART: JP1 (115200 8N1)
  * Pinout: [3V3] (TXD) (RXD) (GND)

Notes:
* There are several variants of the model name: "NAS-I", "NASI", "NAS1".
  Here "NAS1" is adopted for consistent naming scheme.
* The reset button is also a USB copy button in stock FW,
  but in this patch the former is the only default behavior.

Installation via web interface:
1.  Flash sysupgrade image through the stock web interface.

Revert to stock firmware:
1.  Perform sysupgrade with stock image.

Signed-off-by: Sungbo Eo <mans0n@gorani.run>

1 files changed, 231 insertions, 0 deletions

diff --git a/target/linux/kirkwood/files/arch/arm/boot/dts/kirkwood-nas1.dts b/target/linux/kirkwood/files/arch/arm/boot/dts/kirkwood-nas1.dts
new file mode 100644
index 0000000000..a8d86406b5
--- /dev/null
+++ b/target/linux/kirkwood/files/arch/arm/boot/dts/kirkwood-nas1.dts
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "kirkwood.dtsi"
+#include "kirkwood-6281.dtsi"
+
+/ {
+	model = "ipTIME NAS1";
+	compatible = "iptime,nas1", "marvell,kirkwood-88f6281", "marvell,kirkwood";
+
+	aliases {
+		serial0 = &uart0;
+		led-boot = &led_ready;
+		led-failsafe = &led_ready;
+		led-running = &led_ready;
+		led-upgrade = &led_ready;
+	};
+
+	chosen {
+		/*
+		 * "root" argument from the stock bootloader should be ignored
+		 * as it'll prevent the kernel from finding the correct rootfs.
+		 */
+		bootargs-append = " console=ttyS0,115200 root=";
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x00000000 0x10000000>;
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		pinctrl-0 = <&pmx_led>;
+		pinctrl-names = "default";
+
+		hdd {
+			label = "blue:hdd";
+			gpios = <&gpio1 3 GPIO_ACTIVE_HIGH>;
+			linux,default-trigger = "ata1";
+		};
+
+		usb {
+			label = "blue:usb";
+			gpios = <&gpio1 13 GPIO_ACTIVE_LOW>;
+			trigger-sources = <&ehci_port1>;
+			linux,default-trigger = "usbport";
+		};
+
+		led_ready: ready {
+			label = "blue:ready";
+			gpios = <&gpio1 14 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		pinctrl-0 = <&pmx_button>;
+		pinctrl-names = "default";
+
+		reset-copy {
+			label = "Reset/Copy Button";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
+		};
+
+		power {
+			label = "Power Button";
+			linux,code = <KEY_POWER>;
+			gpios = <&gpio1 16 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	gpio-fan {
+		compatible = "gpio-fan";
+
+		pinctrl-0 = <&pmx_fan>;
+		pinctrl-names = "default";
+		gpios = <&gpio1  9 GPIO_ACTIVE_HIGH>,
+		        <&gpio1 10 GPIO_ACTIVE_HIGH>;
+		/* We don't know the exact rpm, just use dummy values here. */
+		gpio-fan,speed-map = <0 0>, <1 1>, <2 2>;
+		#cooling-cells = <2>;
+	};
+
+	gpio-poweroff {
+		compatible = "gpio-poweroff";
+		gpios = <&pca9536 0 GPIO_ACTIVE_LOW>;
+	};
+
+	regulators {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		pinctrl-0 = <&pmx_usb_vbus>;
+		pinctrl-names = "default";
+
+		regulator@1 {
+			compatible = "regulator-fixed";
+			reg = <1>;
+			regulator-name = "USB Power";
+			regulator-min-microvolt = <5000000>;
+			regulator-max-microvolt = <5000000>;
+			enable-active-high;
+			regulator-always-on;
+			gpio = <&gpio1 11 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+&pinctrl {
+	pmx_led: pmx-led {
+		marvell,pins = "mpp35", "mpp45", "mpp46";
+		marvell,function = "gpio";
+	};
+
+	pmx_fan: pmx-fan {
+		marvell,pins = "mpp41", "mpp42";
+		marvell,function = "gpio";
+	};
+
+	pmx_usb_vbus: pmx-usb-vbus {
+		marvell,pins = "mpp43";
+		marvell,function = "gpio";
+	};
+
+	pmx_button: pmx-button {
+		marvell,pins = "mpp44", "mpp48";
+		marvell,function = "gpio";
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <20000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x40000>;
+				read-only;
+			};
+
+			partition@40000 {
+				compatible = "openwrt,uimage", "denx,uimage";
+				openwrt,offset = <0x400>;
+				label = "firmware";
+				reg = <0x40000 0xf80000>;
+			};
+
+			partition@fc0000 {
+				label = "config";
+				reg = <0xfc0000 0x40000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&rtc {
+	status = "disabled";
+};
+
+&i2c0 {
+	status = "okay";
+
+	pca9536: gpio@41 {
+		compatible = "nxp,pca9536";
+		reg = <0x41>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&usb0 {
+	status = "okay";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	ehci_port1: port@1 {
+		reg = <1>;
+		#trigger-source-cells = <0>;
+	};
+};
+
+&mdio {
+	status = "okay";
+
+	ethphyb: ethernet-phy@b {
+		reg = <0x0b>;
+	};
+};
+
+&eth1 {
+	status = "okay";
+};
+
+&eth1port {
+	phy-handle = <&ethphyb>;
+	phy-connection-type = "rgmii-id";
+};
+
+&sata {
+	status = "okay";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+	nr-ports = <1>;
+
+	sata-port@0 {
+		reg = <0>;
+		#thermal-sensor-cells = <0>;
+	};
+};