MIPS: ath79: add initial support for TP-LINK MR3020

The following features are supported:

  * UART;
  * SPI-flash;
  * USB host;
  * GPIO keys and LEDs.

Links:

  * http://www.tp-link.com/en/products/details/?model=TL-MR3020
  * http://wiki.openwrt.org/toh/tp-link/tl-mr3020
  * https://wikidevi.com/wiki/TP-LINK_TL-MR3020

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Cc: Gabor Juhos <juhosg@openwrt.org>
Cc: Alban Bedel <albeu@free.fr>
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12880/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 119 insertions, 0 deletions

diff --git a/arch/mips/boot/dts/qca/Makefile b/arch/mips/boot/dts/qca/Makefile
index 14bd22514283..5e2c20d64138 100644
--- a/arch/mips/boot/dts/qca/Makefile
+++ b/arch/mips/boot/dts/qca/Makefile
@@ -1,5 +1,6 @@
 # All DTBs
 dtb-$(CONFIG_ATH79)                     += ar9132_tl_wr1043nd_v1.dtb
+dtb-$(CONFIG_ATH79)                     += ar9331_tl_mr3020.dtb
 
 # Force kbuild to make empty built-in.o if necessary
 obj-                            += dummy.o
diff --git a/arch/mips/boot/dts/qca/ar9331_tl_mr3020.dts b/arch/mips/boot/dts/qca/ar9331_tl_mr3020.dts
new file mode 100644
index 000000000000..919cf3b854a5
--- /dev/null
+++ b/arch/mips/boot/dts/qca/ar9331_tl_mr3020.dts
@@ -0,0 +1,118 @@
+/dts-v1/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "ar9331.dtsi"
+
+/ {
+        model = "TP-Link TL-MR3020";
+        compatible = "tplink,tl-mr3020";
+
+        aliases {
+                serial0 = &uart;
+        };
+
+        memory@0 {
+                device_type = "memory";
+                reg = <0x0 0x2000000>;
+        };
+
+        leds {
+                compatible = "gpio-leds";
+
+                wlan {
+                        label = "tp-link:green:wlan";
+                        gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
+                        default-state = "off";
+                };
+
+                lan {
+                        label = "tp-link:green:lan";
+                        gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+                        default-state = "off";
+                };
+
+                wps {
+                        label = "tp-link:green:wps";
+                        gpios = <&gpio 26 GPIO_ACTIVE_LOW>;
+                        default-state = "off";
+                };
+
+                led3g {
+                        label = "tp-link:green:3g";
+                        gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
+                        default-state = "off";
+                };
+        };
+
+        gpio-keys-polled {
+                compatible = "gpio-keys-polled";
+                #address-cells = <1>;
+                #size-cells = <0>;
+                poll-interval = <100>;
+
+                button@0 {
+                        label = "wps";
+                        linux,code = <KEY_WPS_BUTTON>;
+                        gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
+                };
+
+                button@1 {
+                        label = "sw1";
+                        linux,code = <BTN_0>;
+                        gpios = <&gpio 18 GPIO_ACTIVE_HIGH>;
+                };
+
+                button@2 {
+                        label = "sw2";
+                        linux,code = <BTN_1>;
+                        gpios = <&gpio 20 GPIO_ACTIVE_HIGH>;
+                };
+        };
+
+        reg_usb_vbus: reg_usb_vbus {
+                compatible = "regulator-fixed";
+                regulator-name = "usb_vbus";
+                regulator-min-microvolt = <5000000>;
+                regulator-max-microvolt = <5000000>;
+                gpio = <&gpio 8 GPIO_ACTIVE_HIGH>;
+                enable-active-high;
+        };
+};
+
+&ref {
+        clock-frequency = <25000000>;
+};
+
+&uart {
+        status = "okay";
+};
+
+&gpio {
+        status = "okay";
+};
+
+&usb {
+        dr_mode = "host";
+        vbus-supply = <&reg_usb_vbus>;
+        status = "okay";
+};
+
+&usb_phy {
+        status = "okay";
+};
+
+&spi {
+        num-chipselects = <1>;
+        status = "okay";
+
+        /* Spansion S25FL032PIF SPI flash */
+        spiflash: s25sl032p@0 {
+                #address-cells = <1>;
+                #size-cells = <1>;
+                compatible = "spansion,s25sl032p", "jedec,spi-nor";
+                spi-max-frequency = <104000000>;
+                reg = <0>;
+        };
+};