ath79: Add support for Sophos AP15C

The Sophos AP15C uses the same hardware as the AP15, but has a reset button.

Based on:
commit 6f1efb289837 ("ath79: add support for Sophos AP100/AP55 family")
author    Andrew Powers-Holmes <andrew@omnom.net>
          Fri, 3 Sep 2021 15:53:57 +0200 (23:53 +1000)
committer Hauke Mehrtens <hauke@hauke-m.de>
          Sat, 16 Apr 2022 16:59:29 +0200 (16:59 +0200)

Unique to AP15C:
 - Reset button
 - External RJ45 serial console port

Flashing instructions:

This firmware can be flashed either via a compatible Sophos SG or XG
firewall appliance, which does not require disassembling the device, or via
the U-Boot console available on the internal UART header.

To flash via XG appliance:
 - Register on Sophos' website for a no-cost Home Use XG firewall license
 - Download and install the XG software on a compatible PC or virtual
   machine, complete initial appliance setup, and enable SSH console access
 - Connect the target AP device to the XG appliance's LAN interface
 - Approve the AP from the XG Web UI and wait until it shows as Active
   (this can take 3-5 minutes)
 - Connect to the XG appliance over SSH and access the Advanced Console
   (Menu option 5, then menu option 3)
 - Run `sudo awetool` and select the menu option to connect to an AP via
   SSH. When prompted to enable SSH on the target AP, select Yes.
 - Wait 2-3 minutes, then select the AP from the awetool menu again. This
   will connect you to a root shell on the target AP.
 - Copy the firmware to /tmp/openwrt.bin on the target AP via SCP/TFTP/etc
 - Run `mtd -r write /tmp/openwrt.bin astaro_image`
 - When complete, the access point will reboot to OpenWRT.

To flash via U-Boot serial console:
 - Configure a TFTP server on your PC, and set IP address 192.168.99.8 with
   netmask 255.255.255.0
 - Copy the firmware .bin to the TFTP server and rename to 'uImage_AP15C'
 - Open the target AP's enclosure and locate the 4-pin 3.3V UART header [4]
 - Connect the AP ethernet to your PC's ethernet port
 - Connect a terminal to the UART at 115200 8/N/1 as usual
 - Power on the AP and press a key to cancel autoboot when prompted
 - Run the following commands at the U-Boot console:
    - `tftpboot`
    - `cp.b $fileaddr 0x9f070000 $filesize`
    - `boot`
 - The access point will boot to OpenWRT.

Signed-off-by: David Lutz <kpanic@hirnduenger.de>

3 files changed, 168 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9557_sophos_ap15c.dts b/target/linux/ath79/dts/qca9557_sophos_ap15c.dts
new file mode 100644
index 0000000000..68d02e97a5
--- /dev/null
+++ b/target/linux/ath79/dts/qca9557_sophos_ap15c.dts
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca955x.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	compatible = "sophos,ap15c", "qca,qca9557";
+	model = "Sophos AP15C";
+
+	aliases {
+		led-boot = &led_status_green;
+		led-failsafe = &led_status_yellow;
+		led-running = &led_status_green;
+		led-upgrade = &led_status_yellow;
+		label-mac-device = &eth0;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200n8";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_green: status_green {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		led_status_yellow: status_yellow {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_YELLOW>;
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&spi {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <25000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x000000 0x040000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "u-boot-env";
+				reg = <0x040000 0x010000>;
+			};
+
+			partition@50000 {
+				label = "art";
+				reg = <0x050000 0x010000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					cal_art_1000: calibration@1000 {
+						reg = <0x1000 0x440>;
+					};
+				};
+			};
+
+			partition@60000 {
+				label = "config";
+				reg = <0x060000 0x010000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					macaddr_config_201a: macaddr@201a {
+						reg = <0x201a 0x6>;
+					};
+				};
+			};
+
+			partition@70000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x070000 0xf90000>;
+			};
+		};
+	};
+};
+
+&mdio0 {
+	status = "okay";
+
+	phy-mask = <0x10>;
+
+	phy4: ethernet-phy@4 {
+		reg = <4>;
+		eee-broken-100tx;
+		eee-broken-1000t;
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	pll-data = <0xa6000000 0xa0000101 0xa0001313>;
+
+	nvmem-cells = <&macaddr_config_201a>;
+	nvmem-cell-names = "mac-address";
+
+	phy-mode = "rgmii-id";
+	phy-handle = <&phy4>;
+
+	gmac_config: gmac-config {
+		device = <&gmac>;
+
+		rgmii-enabled = <1>;
+
+		rxdv-delay = <3>;
+		rxd-delay = <3>;
+		txen-delay = <3>;
+		txd-delay = <3>;
+	};
+};
+
+&wmac {
+	status = "okay";
+
+	nvmem-cells = <&cal_art_1000>;
+	nvmem-cell-names = "calibration";
+};
diff --git a/target/linux/ath79/generic/base-files/etc/board.d/02_network b/target/linux/ath79/generic/base-files/etc/board.d/02_network
index 8474c1c4c2..8f79a3fad8 100644
--- a/target/linux/ath79/generic/base-files/etc/board.d/02_network
+++ b/target/linux/ath79/generic/base-files/etc/board.d/02_network
@@ -76,6 +76,7 @@ ath79_setup_interfaces()
 	ruckus,zf7351|\
 	siemens,ws-ap3610|\
 	sophos,ap15|\
+	sophos,ap15c|\
 	sophos,ap55|\
 	sophos,ap55c|\
 	sophos,ap100|\
diff --git a/target/linux/ath79/image/generic.mk b/target/linux/ath79/image/generic.mk
index c075f050db..0173f5cb16 100644
--- a/target/linux/ath79/image/generic.mk
+++ b/target/linux/ath79/image/generic.mk
@@ -2972,6 +2972,14 @@ define Device/sophos_ap15
 endef
 TARGET_DEVICES += sophos_ap15
 
+define Device/sophos_ap15c
+  SOC := qca9557
+  DEVICE_VENDOR := Sophos
+  DEVICE_MODEL := AP15C
+  IMAGE_SIZE := 15936k
+endef
+TARGET_DEVICES += sophos_ap15c
+
 define Device/sophos_ap55
   SOC := qca9558
   DEVICE_VENDOR := Sophos