This board has been supported in the ar71xx.

Links:
* https://mikrotik.com/product/RB912UAG-2HPnD
* https://mikrotik.com/product/RB912UAG-5HPnD
* https://openwrt.org/toh/hwdata/mikrotik/mikrotik_rb912uag-2hpnd
* https://openwrt.org/toh/hwdata/mikrotik/mikrotik_rb912uag-5hpnd

Hardware:
* SoC: Atheros AR9342,
* RAM: DDR 64MB,
* SPI NOR: 64KB,
* NAND: 128MB,
* Ethernet: x1 10/100/1000 port with passive POE in,
* Wi-Fi: 802.11bgn,
* 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.
* 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.

You can flash image by sysupgrade utility or load it by net
(by DHCP/TFTP, hold the button while booting).

Co-Developed-by: Koen Vandeputte <[email protected]>
Signed-off-by: Denis Kalashnikov <[email protected]>
---

Changelog:

v1->v2:
- Delete uneeded comments from DTS,
- Delete ascii-art of board scheme near NAND latch from DTS,
- Rewrite gpio_latch and nand_gpio nodes to be consistent with the
  new versions of drivers,
- Fix SPI NOR flash and SPI serial shift register maximum speeds
  (thanks to Koen Vandeputte),
- Add UART, PCIe, USB support and gpio exports (thanks to Koen Vandeputte),
- Fix Ethernet node (thanks to Koen Vandeputte),
- Add key and beeper nodes in disabled state just to be documented.

---
 .../dts/ar9342_mikrotik_routerboard-912g.dts  | 233 ++++++++++++++++++
 target/linux/ath79/image/mikrotik.mk          |   9 +
 .../base-files/etc/board.d/02_network         |   2 +
 .../etc/hotplug.d/firmware/10-ath9k-eeprom    |   1 +
 .../base-files/lib/upgrade/platform.sh        |   1 +
 5 files changed, 246 insertions(+)
 create mode 100644 target/linux/ath79/dts/ar9342_mikrotik_routerboard-912g.dts

diff --git a/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912g.dts 
b/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912g.dts
new file mode 100644
index 0000000000..a23fc04a99
--- /dev/null
+++ b/target/linux/ath79/dts/ar9342_mikrotik_routerboard-912g.dts
@@ -0,0 +1,233 @@
+// 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-912g", "qca,ar9342";
+       model = "Mikrotik RouterBoard 912G";
+
+       leds {
+               compatible = "gpio-leds";
+
+               led_power {
+                       label = "green:power";
+                       gpios = <&gpio_latch 1 GPIO_ACTIVE_HIGH>;
+                       default-state = "on";
+               };
+
+               led_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>;
+               };
+       };
+
+       beeper {
+               status = "disabled";
+               compatible = "gpio-beeper";
+               gpios = <&ssr 5 GPIO_ACTIVE_HIGH>;
+       };
+
+       keys {
+               status = "disabled";
+               compatible = "gpio-keys";
+               reset {
+                       label = "reset";
+                       linux,code = <KEY_RESTART>;
+                       gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+                       debounce-interval = <60>;
+               };
+       };
+
+       gpio_export {
+               compatible = "gpio-export";
+
+               usb_select {
+                       label = "select:usb";
+                       gpio-export,name = "mikrotik:select:usb";
+                       gpio-export,output = <0>; /* 0: mini-pcie, 1: Type-A 
port */
+                       gpios = <&ssr 6 GPIO_ACTIVE_LOW>;
+               };
+
+               pcie_power {
+                       label = "power:pcie";
+                       gpio-export,name = "mikrotik:power:pcie";
+                       gpio-export,output = <1>;
+                       gpios = <&ssr 7 GPIO_ACTIVE_LOW>;
+               };
+       };
+};
+
+&ahb {
+       gpio_latch: gpio_latch {
+               compatible = "gpio-latch";
+               gpio-controller;
+               #gpio-cells = <2>;
+               gpios = <&gpio 0 0>,
+                       <&gpio 1 0>,
+                       <&gpio 2 0>,
+                       <&gpio 3 0>,
+                       <&gpio 4 0>,
+                       <&gpio 13 0>,
+                       <&gpio 14 0>,
+                       <&gpio 15 0>,
+                       <&gpio 11 0>;
+               latch-enable-gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+       };
+
+       nand_gpio {
+               compatible = "rb91x-nand";
+
+               /* NAND control gpios */
+               read-gpios = <&gpio_latch 3 GPIO_ACTIVE_HIGH>;
+               rdy-gpios  = <&gpio_latch 4 GPIO_ACTIVE_HIGH>;
+               nce-gpios  = <&gpio_latch 5 GPIO_ACTIVE_LOW>; /* Chip Enable */
+               cle-gpios  = <&gpio_latch 6 GPIO_ACTIVE_HIGH>; /* Command Latch 
*/
+               ale-gpios  = <&gpio_latch 7 GPIO_ACTIVE_HIGH>; /* Address Latch 
*/
+               nrw-gpios  = <&gpio 12 GPIO_ACTIVE_LOW>; /* Read/Write */
+
+               latch-enable-gpios = <&gpio_latch 8 GPIO_ACTIVE_LOW>;
+
+               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>;
+                       };
+               };
+       };
+};
+
+&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 = <80000000>;
+
+               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>;
+       };
+};
+
+&pcie {
+       status = "okay";
+};
+
+&uart {
+       status = "okay";
+};
+
+&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;
+};
+
+&usb {
+       status = "okay";
+};
+
+&usb_phy {
+       status = "okay";
+};
diff --git a/target/linux/ath79/image/mikrotik.mk 
b/target/linux/ath79/image/mikrotik.mk
index 74f8603b5a..0072ec527d 100644
--- a/target/linux/ath79/image/mikrotik.mk
+++ b/target/linux/ath79/image/mikrotik.mk
@@ -9,6 +9,15 @@ define Device/mikrotik_routerboard-493g
 endef
 TARGET_DEVICES += mikrotik_routerboard-493g
 
+define Device/mikrotik_routerboard-912g
+  $(Device/mikrotik_nand)
+  SOC := ar9342
+  DEVICE_MODEL := RouterBOARD 912G
+  DEVICE_PACKAGES += kmod-usb-ehci kmod-usb2 kmod-gpio-beeper
+  SUPPORTED_DEVICES += rb-912uag-5hpnd rb-912uag-2hpnd
+endef
+TARGET_DEVICES += mikrotik_routerboard-912g
+
 define Device/mikrotik_routerboard-921gs-5hpacd-15s
   $(Device/mikrotik_nand)
   SOC := qca9558
diff --git a/target/linux/ath79/mikrotik/base-files/etc/board.d/02_network 
b/target/linux/ath79/mikrotik/base-files/etc/board.d/02_network
index 4ffe82588c..07bb22c088 100644
--- a/target/linux/ath79/mikrotik/base-files/etc/board.d/02_network
+++ b/target/linux/ath79/mikrotik/base-files/etc/board.d/02_network
@@ -14,6 +14,7 @@ ath79_setup_interfaces()
                ucidef_add_switch "switch1" \
                        "0@eth1" "1:lan:4" "2:lan:1" "3:lan:2" "4:lan:3"
                ;;
+       mikrotik,routerboard-912g|\
        mikrotik,routerboard-921gs-5hpacd-15s|\
        mikrotik,routerboard-lhg-2nd|\
        mikrotik,routerboard-sxt-5nd-r2|\
@@ -36,6 +37,7 @@ ath79_setup_macs()
        local mac_base="$(cat /sys/firmware/mikrotik/hard_config/mac_base)"
 
        case "$board" in
+       mikrotik,routerboard-912g|\
        mikrotik,routerboard-921gs-5hpacd-15s|\
        mikrotik,routerboard-lhg-2nd|\
        mikrotik,routerboard-sxt-5nd-r2|\
diff --git 
a/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom 
b/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
index 7ef6fdbe0f..7868ceaac9 100644
--- 
a/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
+++ 
b/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
@@ -23,6 +23,7 @@ board=$(board_name)
 case "$FIRMWARE" in
 "ath9k-eeprom-ahb-18100000.wmac.bin")
        case $board in
+       mikrotik,routerboard-912g|\
        mikrotik,routerboard-lhg-2nd|\
        mikrotik,routerboard-sxt-5nd-r2|\
        mikrotik,routerboard-wapr-2nd)
diff --git a/target/linux/ath79/mikrotik/base-files/lib/upgrade/platform.sh 
b/target/linux/ath79/mikrotik/base-files/lib/upgrade/platform.sh
index 97d388168f..736a0932f7 100644
--- a/target/linux/ath79/mikrotik/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ath79/mikrotik/base-files/lib/upgrade/platform.sh
@@ -32,6 +32,7 @@ platform_do_upgrade() {
 
        case "$board" in
        mikrotik,routerboard-493g|\
+       mikrotik,routerboard-912g|\
        mikrotik,routerboard-921gs-5hpacd-15s|\
        mikrotik,routerboard-922uags-5hpacd|\
        mikrotik,routerboard-sxt-5nd-r2)
-- 
2.26.3


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