ath79: add support for MikroTik RouterBOARD 912UAG-2HPnD

This board has been supported in the ar71xx.

Links:
* https://mikrotik.com/product/RB912UAG-2HPnD
* https://openwrt.org/toh/hwdata/mikrotik/mikrotik_rb912uag-2hpnd

This also supports the 5GHz flavour of the board.

Hardware:
* SoC: Atheros AR9342,
* RAM: DDR 64MB,
* SPI NOR: 64KB,
* NAND: 128MB,
* Ethernet: x1 10/100/1000 port with passive POE in,
* Wi-Fi: 802.11 b/g/n,
* PCIe,
* USB: 2.0 EHCI controller, connected to mPCIe slot and a Type-A
  port -- both can be used for LTE modem, but only one can be
  used at any time.
* LEDs: 5 general purpose LEDs (led1..led5), power LED, user LED,
  Ethernet phy LED,
* Button,
* Beeper.

Not working:
* Button: it shares gpio line 15 with NAND ALE and NAND IO7,
  and current drivers doesn't easily support this configuration,
* Beeper: it is connected to bit 5 of a serial shift register
  (tested with sysfs led trigger timer). But kmod-gpio-beeper
  doesn't work -- we left this as is for now.

Flashing:
* Use the RouterBOARD Reset button to enable TFTP netboot,
boot kernel and initramfs and then perform sysupgrade.
* From ar71xx OpenWrt firmware run:
  $ sysupgrade -F /tmp/<sysupgrade.bin>
For more info see: https://openwrt.org/toh/mikrotik/common.

Co-Developed-by: Koen Vandeputte <koen.vandeputte@citymesh.com>
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Signed-off-by: Denis Kalashnikov <denis281089@gmail.com>

1 files changed, 212 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912uag-2hpnd.dts b/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912uag-2hpnd.dts
new file mode 100644
index 0000000000..cc5553acda
--- /dev/null
+++ b/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912uag-2hpnd.dts
@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "ar9344.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "mikrotik,routerboard-912uag-2hpnd", "qca,ar9342";
+	model = "MikroTik RouterBOARD 912UAG-2HPnD";
+
+	aliases {
+                led-boot = &led_power;
+                led-failsafe = &led_power;
+                led-running = &led_power;
+                led-upgrade = &led_power;
+        };
+
+	gpio_latch: gpio_latch {
+		compatible = "gpio-latch";
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpios = <&gpio 0 GPIO_ACTIVE_HIGH>,
+			<&gpio 1 GPIO_ACTIVE_HIGH>,
+			<&gpio 2 GPIO_ACTIVE_HIGH>,
+			<&gpio 3 GPIO_ACTIVE_HIGH>,
+			<0>, /* Not connected */
+			<&gpio 13 GPIO_ACTIVE_HIGH>,
+			<&gpio 14 GPIO_ACTIVE_HIGH>,
+			<&gpio 15 GPIO_ACTIVE_HIGH>,
+			<&gpio 11 GPIO_ACTIVE_LOW>; /* Latch Enable */
+	};
+
+	nand_gpio {
+		compatible = "mikrotik,rb91x-nand";
+
+		gpios = <&gpio_latch 3 GPIO_ACTIVE_HIGH>, /* Read */
+			<&gpio 4 GPIO_ACTIVE_HIGH>,       /* Ready (RDY) */
+			<&gpio_latch 5 GPIO_ACTIVE_LOW>,  /* Chip Enable (nCE) */
+			<&gpio_latch 6 GPIO_ACTIVE_HIGH>, /* Command Latch Enable (CLE) */
+			<&gpio_latch 7 GPIO_ACTIVE_HIGH>, /* Address Latch Enable (ALE) */
+			<&gpio 12 GPIO_ACTIVE_LOW>,       /* Read/Write Enable (nRW) */
+			<&gpio_latch 8 GPIO_ACTIVE_LOW>;  /* Latch Enable (nLE) */
+
+		partitions {
+			compatible = "fixed-partitions";
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "booter";
+				reg = <0x0 0x0040000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "kernel";
+				reg = <0x0040000 0x03c0000>;
+			};
+
+			partition@400000 {
+				label = "ubi";
+				reg = <0x0400000 0x7c00000>;
+			};
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power: power {
+			label = "green:power";
+			gpios = <&gpio_latch 1 GPIO_ACTIVE_HIGH>;
+			default-state = "on";
+		};
+
+		user {
+			label = "green:user";
+			gpios = <&gpio_latch 2 GPIO_ACTIVE_HIGH>;
+		};
+
+		led1 {
+			label = "green:led1";
+			gpios = <&ssr 0 GPIO_ACTIVE_HIGH>;
+		};
+
+		led2 {
+			label = "green:led2";
+			gpios = <&ssr 1 GPIO_ACTIVE_HIGH>;
+		};
+
+		led3 {
+			label = "green:led3";
+			gpios = <&ssr 2 GPIO_ACTIVE_HIGH>;
+		};
+
+		led4 {
+			label = "green:led4";
+			gpios = <&ssr 3 GPIO_ACTIVE_HIGH>;
+		};
+
+		led5 {
+			label = "green:led5";
+			gpios = <&ssr 4 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	gpio-export {
+		compatible = "gpio-export";
+
+		usb_power {
+			gpio-export,name = "power-usb";
+			gpio-export,output = <1>;
+			gpios = <&ssr 6 GPIO_ACTIVE_HIGH>;
+		};
+
+		pcie_power {
+			gpio-export,name = "power-pcie";
+			gpio-export,output = <0>;
+			gpios = <&ssr 7 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+&spi {
+	status = "okay";
+
+	compatible = "qca,ar7100-spi";
+
+	cs-gpios = <0>, <&gpio_latch 0 GPIO_ACTIVE_LOW>;
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <50000000>;
+
+		partitions {
+			compatible = "mikrotik,routerboot-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "routerboot";
+				reg = <0x0 0x0>;
+				read-only;
+			};
+
+			hard_config: hard_config {
+				read-only;
+			};
+
+			bios {
+				size = <0x1000>;
+				read-only;
+			};
+
+			soft_config {
+			};
+		};
+	};
+
+	ssr: ssr@1 {
+		compatible = "fairchild,74hc595";
+		gpio-controller;
+		#gpio-cells = <2>;
+		registers-number = <1>;
+		reg = <1>;
+		spi-max-frequency = <50000000>;
+	};
+};
+
+&mdio0 {
+	status = "okay";
+
+	phy-mask = <0>;
+
+	phy0: ethernet-phy@0 {
+		reg = <0>;
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-mode = "rgmii-id";
+	phy-handle = <&phy0>;
+	pll-data = <0x02000000 0x00000101 0x00001313>;
+
+	gmac-config {
+		device = <&gmac>;
+		rgmii-gmac0 = <1>;
+		rgmii-enabled = <1>;
+		rxd-delay = <1>;
+		txd-delay = <1>;
+	};
+};
+
+&wmac {
+	status = "okay";
+	qca,no-eeprom;
+};
+
+&pcie {
+	status = "okay";
+};
+
+&usb {
+	status = "okay";
+};
+
+&usb_phy {
+	status = "okay";
+};