ramips: add support for the HNET C108

The HNET C108
(http://www.szhwtech88.com/Product-product-cid-100-id-4374.html) is a
mifi based on MT7602A, which has the following specifications:

* CPU: MT7620A
* 1x 10/100Mbps Ethernet.
* 16 MB Flash.
* 64 MB RAM.
* 1x USB 2.0 port. Only power is connected, this port is meant for
charging other devices.
* 1x mini-PCIe slots.
* 1x SIM slots.
* 1x 2.4Ghz WIFI.
* 1x button.
* 6000 mAh battery.
* 5x controllable LEDs.

Works:
* Wifi.
* Switch.
* mini-PCIe slot. Only tested with a USB device (a modem).
* SIM slot.
* Sysupgrade.
* Button (reset).

Not working (also applies to the factory firmware):
* Wifi LED. It is always switched on, there is no relation to the
up/down state or activity of the wireless interface.

Not tested:
* SD card reader.

Notes:
* The C108 has no dedicated status LED. I therefore set the LAN LED as
status LED.

Installation:
The router comes pre-installed with OpenWRT, including a variant of
Luci. The initial firmware install can be done through this UI,
following normal procedure. I.e., access the UI and update the firmware
using the sysupgrade-image. Remember to select that you do not want to
keep existing settings.

Recovery:
If you brick the device, the C108 supports recovery using TFTP. Keep the
reset button pressed for ~5sec when booting to trigger TFTP. Set the
address of the network interface on your machine to 10.10.10.3/24, and
rename your image file to Kernal.bin.

Signed-off-by: Kristian Evensen <kristian.evensen@gmail.com>

1 files changed, 177 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/C108.dts b/target/linux/ramips/dts/C108.dts
new file mode 100644
index 0000000000..c449a36fc7
--- /dev/null
+++ b/target/linux/ramips/dts/C108.dts
@@ -0,0 +1,177 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2017 Kristian Evensen <kristian.evensen@gmail.com>.
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/dts-v1/;
+
+#include "mt7620a.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "hnet,c108", "ralink,mt7620a-soc";
+	model = "HNET C108";
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	gpio-export {
+		compatible = "gpio-export";
+		#size-cells = <0>;
+
+		power_modem {
+			gpio-export,name = "power_modem";
+			gpio-export,output = <1>;
+			gpios = <&gpio2 2 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		sdcard {
+			label = "c108:green:sdcard";
+			gpios = <&gpio0 13 GPIO_ACTIVE_HIGH>;
+		};
+
+		modem_green {
+			label = "c108:green:modem";
+			gpios = <&gpio1 14 GPIO_ACTIVE_LOW>;
+		};
+
+		modem_red {
+			label = "c108:red:modem";
+			gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
+		};
+
+		lan_red {
+			label = "c108:red:lan";
+			gpios = <&gpio2 3 GPIO_ACTIVE_HIGH>;
+		};
+
+		lan_green {
+			label = "c108:green:lan";
+			gpios = <&gpio2 4 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	gpio-keys-polled {
+		compatible = "gpio-keys-polled";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&gpio2 {
+	status = "okay";
+};
+
+&spi0 {
+	status = "okay";
+
+	en25q128@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x30000>;
+			read-only;
+		};
+
+		partition@30000 {
+			label = "u-boot-env";
+			reg = <0x30000 0x10000>;
+			read-only;
+		};
+
+		factory: partition@40000 {
+			label = "factory";
+			reg = <0x40000 0x10000>;
+			read-only;
+		};
+
+		partition@50000 {
+			label = "firmware";
+			reg = <0x50000 0xfb0000>;
+		};
+	};
+};
+
+&sdhci {
+	status = "okay";
+};
+
+&ehci {
+	status = "okay";
+};
+
+&ohci {
+	status = "okay";
+};
+
+&ethernet {
+	mtd-mac-address = <&factory 0x28>;
+};
+
+&wmac {
+	ralink,mtd-eeprom = <&factory 0>;
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		default {
+			ralink,group = "i2c", "uartf", "spi refclk", "ephy";
+			ralink,function = "gpio";
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};