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>

1 files changed, 24 insertions, 0 deletions

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>;
+		};
+	};
+};