ramips: add support for Ubiquiti EdgeRouter X-SFP

This patch adds support for the Ubiquiti EdgeRouter X-SFP and
improves support for the EdgeRouter X (PoE-passthrough).

Specification:
- SoC: MediaTek MT7621AT
- Flash: 256 MiB
- RAM: 265 MiB
- Ethernet: 5 x LAN (1000 Mbps)
- UART: 1 x UART on PCB (3.3V, RX, TX, GND) - 57600 8N1
- EdgeRouter X:
  - 1 x PoE-Passtrough (Eth4)
  - powered by Wallwart or passive PoE
- EdgeRouter X-SFP:
  - 5 x PoE-Out (24V, passive)
  - 1 x SFP (unknown status)
  - powered by Wallwart (24V)

Doesn't work:
* SoC has crypto engine but no open driver.
* SoC has nat acceleration, but no open driver.
* This router has 2MB spi flash soldered in but MT
  nand/spi drivers do not support pin sharing,
  so it is not accessable and disabled. Stock
  firmware could read it and it was empty.

Installation

via vendor firmware:
- build an Initrd-image (> 3MiB) and upload the factory-image
- initrd can have luci-mod-failsafe
- flash final firmware via LuCI / sysupgrade on rebooted system

via TFTP:
- stop uboot into tftp-load into option "1"
- upload factory.bin image

Signed-off-by: Sven Roederer <devel-sven@geroedel.de>

3 files changed, 131 insertions, 102 deletions

diff --git a/target/linux/ramips/dts/UBNT-ER-e50.dtsi b/target/linux/ramips/dts/UBNT-ER-e50.dtsi
new file mode 100644
index 0000000000..b38c719494
--- /dev/null
+++ b/target/linux/ramips/dts/UBNT-ER-e50.dtsi
@@ -0,0 +1,106 @@
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "ubiquiti,edgerouterx";
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x10000000>;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,57600";
+	};
+
+	gpio-keys-polled {
+		compatible = "gpio-keys-polled";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+};
+
+&ethernet {
+	mtd-mac-address = <&factory 0x22>;
+};
+
+&nand {
+	status = "okay";
+
+	partition@0 {
+		label = "u-boot";
+		reg = <0x0 0x80000>;
+		read-only;
+	};
+
+	partition@80000 {
+		label = "u-boot-env";
+		reg = <0x80000 0x60000>;
+		read-only;
+	};
+
+	factory: partition@e0000 {
+		label = "factory";
+		reg = <0xe0000 0x60000>;
+	};
+
+	partition@140000 {
+		label = "kernel1";
+		reg = <0x140000 0x300000>;
+	};
+
+	partition@440000 {
+		label = "kernel2";
+		reg = <0x440000 0x300000>;
+	};
+
+	partition@740000 {
+		label = "ubi";
+		reg = <0x740000 0xf7c0000>;
+	};
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		gpio {
+			ralink,group = "uart2", "uart3", "i2c", "pcie", "rgmii2", "jtag";
+			ralink,function = "gpio";
+		};
+	};
+};
+
+&spi0 {
+	/* This board has 2Mb spi flash soldered in and visible
+	   from manufacturer's firmware.
+	   But this SoC shares spi and nand pins,
+	   and current driver does't handle this sharing well */
+	status = "disabled";
+
+	m25p80@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		reg = <1>;
+		spi-max-frequency = <10000000>;
+		m25p,chunked-io = <32>;
+
+		partition@0 {
+			label = "spi";
+			reg = <0x0 0x200000>;
+			read-only;
+		};
+	};
+};
+
+&xhci {
+	status = "disabled";
+};
diff --git a/target/linux/ramips/dts/UBNT-ERX-SFP.dts b/target/linux/ramips/dts/UBNT-ERX-SFP.dts
new file mode 100644
index 0000000000..ca26d81721
--- /dev/null
+++ b/target/linux/ramips/dts/UBNT-ERX-SFP.dts
@@ -0,0 +1,24 @@
+/dts-v1/;
+
+#include "UBNT-ER-e50.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	model = "UBNT-ERX-SFP";
+	compatible = "ubiquiti,edgerouterx-sfp";
+
+	i2c-gpio {
+		compatible = "i2c-gpio";
+		gpios = <&gpio0 3 GPIO_ACTIVE_HIGH /* sda */
+		         &gpio0 4 GPIO_ACTIVE_HIGH /* scl */
+		        >;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		pca9555@25 {
+			compatible = "pca9555";
+			reg = <0x25>;
+		};
+	};
+};
diff --git a/target/linux/ramips/dts/UBNT-ERX.dts b/target/linux/ramips/dts/UBNT-ERX.dts
index cf86bbb7e6..556d1156c3 100644
--- a/target/linux/ramips/dts/UBNT-ERX.dts
+++ b/target/linux/ramips/dts/UBNT-ERX.dts
@@ -1,108 +1,7 @@
 /dts-v1/;
 
-#include "mt7621.dtsi"
-
-#include <dt-bindings/gpio/gpio.h>
-#include <dt-bindings/input/input.h>
+#include "UBNT-ER-e50.dtsi"
 
 / {
 	model = "UBNT-ERX";
-
-	memory@0 {
-		device_type = "memory";
-		reg = <0x0 0x10000000>;
-	};
-
-	chosen {
-		bootargs = "console=ttyS0,57600";
-	};
-
-	gpio-keys-polled {
-		compatible = "gpio-keys-polled";
-		#address-cells = <1>;
-		#size-cells = <0>;
-		poll-interval = <20>;
-
-		reset {
-			label = "reset";
-			gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
-			linux,code = <KEY_RESTART>;
-		};
-	};
-};
-
-&ethernet {
-	mtd-mac-address = <&factory 0x22>;
-};
-
-&nand {
-	status = "okay";
-
-	partition@0 {
-		label = "u-boot";
-		reg = <0x0 0x80000>;
-		read-only;
-	};
-
-	partition@80000 {
-		label = "u-boot-env";
-		reg = <0x80000 0x60000>;
-		read-only;
-	};
-
-	factory: partition@e0000 {
-		label = "factory";
-		reg = <0xe0000 0x60000>;
-	};
-
-	partition@140000 {
-		label = "kernel1";
-		reg = <0x140000 0x300000>;
-	};
-
-	partition@440000 {
-		label = "kernel2";
-		reg = <0x440000 0x300000>;
-	};
-
-	partition@740000 {
-		label = "ubi";
-		reg = <0x740000 0xf7c0000>;
-	};
-};
-
-&pinctrl {
-	state_default: pinctrl0 {
-		gpio {
-			ralink,group = "uart2", "uart3", "i2c", "pcie", "rgmii2", "jtag";
-			ralink,function = "gpio";
-		};
-	};
-};
-
-&spi0 {
-	/* This board has 2Mb spi flash soldered in and visible
-	   from manufacturer's firmware.
-	   But this SoC shares spi and nand pins,
-	   and current driver does't handle this sharing well */
-	status = "disabled";
-
-	m25p80@0 {
-		#address-cells = <1>;
-		#size-cells = <1>;
-		compatible = "jedec,spi-nor";
-		reg = <1>;
-		spi-max-frequency = <10000000>;
-		m25p,chunked-io = <32>;
-
-		partition@0 {
-			label = "spi";
-			reg = <0x0 0x200000>;
-			read-only;
-		};
-	};
-};
-
-&xhci {
-	status = "disabled";
 };