ramips: Add support for SERCOMM NA502S

The SERCOMM NA502s is a smart home gateway manufactured by SERCOMM and sold
under different brands (among others, A1 Telekom Austria SmartHome Premium
Gateway). It has multi-protocol radio support in addition to LAN and WiFi.

Note: BLE and audio are currently unsupported.

Specifications
--------------

  - MT7621ST 880MHz, Single-Core, Dual-Thread
  - MT7603EN 2.4GHz WiFi
  - MT7662EN 5GHz WiFi + BLE
  - 128MiB NAND
  - 256MiB DDR3 RAM
  - SD3503 ZWave Controller
  - EM357 Zigbee Coordinator
  - Telit UMTS module
  - Rechargeable battery
  - speaker and microphone

MAC address assignment
----------------------

LAN MAC is read from the config partition, WiFi 2.4GHz is LAN+2 and matches
the OEM firmware. WiFi 5GHz with LAN+1 is an educated guess since the
OEM firmware does not enable 5GHz WiFi.

Installation
------------
Attach serial console, then boot the initramfs image via TFTP.
Once inside OpenWrt, run sysupgrade -n with the sysupgrade file.

Attention: The device has a dual-firmware design. We overwrite kernel2,
since kernel1 contains an automatic recovery image.

If you get NAND ECC errors and are stuck with bad eraseblocks, try to
erase the mtd partition first with

mtd unlock ubi
mtd erase ubi

This should only be needed once.

Signed-off-by: Andreas Böhler <dev@aboehler.at>
(cherry picked from commit 9ee6ac00c43cc253ac554495edb6214563ab1f31)

4 files changed, 379 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7621_sercomm_na502s.dts b/target/linux/ramips/dts/mt7621_sercomm_na502s.dts
new file mode 100644
index 0000000000..dc71dbd050
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_sercomm_na502s.dts
@@ -0,0 +1,362 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "sercomm,na502s", "mediatek,mt7621-soc";
+	model = "SERCOMM NA502S";
+
+	aliases {
+		led-boot = &led_power;
+		led-failsafe = &led_power;
+		led-running = &led_power;
+		led-upgrade = &led_power;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power: power {
+			label = "green:power";
+			gpios = <&gpio 0 GPIO_ACTIVE_LOW>;
+		};
+
+		wifi {
+			label = "green:wifi";
+			gpios = <&gpio_expander1 0 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		zwave {
+			label = "green:zwave";
+			gpios = <&gpio_expander1 1 GPIO_ACTIVE_LOW>;
+		};
+
+		zigbee {
+			label = "green:zigbee";
+			gpios = <&gpio_expander1 2 GPIO_ACTIVE_LOW>;
+		};
+
+		bluetooth {
+			label = "green:bluetooth";
+			gpios = <&gpio_expander1 3 GPIO_ACTIVE_LOW>;
+		};
+
+		rf433 {
+			label = "green:rf433";
+			gpios = <&gpio_expander1 4 GPIO_ACTIVE_LOW>;
+		};
+
+		service {
+			label = "green:service";
+			gpios = <&gpio_expander1 5 GPIO_ACTIVE_LOW>;
+		};
+
+		3g {
+			label = "green:3g";
+			gpios = <&gpio_expander1 6 GPIO_ACTIVE_LOW>;
+		};
+
+		voice {
+			label = "green:voice";
+			gpios = <&gpio_expander1 7 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		battery_tamper {
+			label = "battery_tamper";
+			gpios = <&gpio 16 GPIO_ACTIVE_HIGH>;
+			linux,code = <BTN_1>;
+		};
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 28 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		voice {
+			label = "voice";
+			gpios = <&gpio 29 GPIO_ACTIVE_LOW>;
+			linux,code = <BTN_0>;
+		};
+
+		select {
+			label = "select";
+			gpios = <&gpio 31 GPIO_ACTIVE_LOW>;
+			linux,code = <BTN_1>;
+		};
+
+		sync {
+			label = "sync";
+			gpios = <&gpio 32 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RFKILL>;
+		};
+	};
+
+	gpio-export {
+		compatible = "gpio-export";
+
+		zwave_reset {
+			gpio-export,name = "zwave_reset";
+			gpio-export,output = <1>;
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		lprf_reset {
+			gpio-export,name = "lprf_reset";
+			gpio-export,output = <1>;
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+
+		charger_detect {
+			gpio-export,name = "charger_detect";
+			gpios = <&gpio 15 GPIO_ACTIVE_HIGH>;
+		};
+
+		buzzer {
+			gpio-export,name = "buzzer";
+			gpio-export,output = <0>;
+			gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
+		};
+
+		3g_hw_shunt_en {
+			gpio-export,name = "3g_hw_shunt_en";
+			gpio-export,output = <0>;
+			gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
+		};
+
+		3g_sw_on_off {
+			gpio-export,name = "3g_sw_on_off";
+			gpio-export,output = <1>;
+			gpios = <&gpio 23 GPIO_ACTIVE_LOW>;
+		};
+
+		3g_wake_up {
+			gpio-export,name = "3g_wake_up";
+			gpio-export,output = <0>;
+			gpios = <&gpio 30 GPIO_ACTIVE_LOW>;
+		};
+
+		3g_hw_reset {
+			gpio-export,name = "3g_hw_reset";
+			gpio-export,output = <1>;
+			gpios = <&gpio 33 GPIO_ACTIVE_LOW>;
+		};
+
+		zigbee_reset {
+			gpio-export,name = "zigbee_reset";
+			gpio-export,output = <1>;
+			gpios = <&gpio_expander0 0 GPIO_ACTIVE_LOW>;
+		};
+
+		zigbee_boot {
+			gpio-export,name = "zigbee_boot";
+			gpio-export,output = <1>;
+			gpios = <&gpio_expander0 1 GPIO_ACTIVE_LOW>;
+		};
+
+		2g_sw0 {
+			gpio-export,name = "2g_sw0";
+			gpio-export,output = <1>;
+			gpios = <&gpio_expander0 2 GPIO_ACTIVE_LOW>;
+		};
+
+		2g_sw1 {
+			gpio-export,name = "2g_sw1";
+			gpio-export,output = <1>;
+			gpios = <&gpio_expander0 3 GPIO_ACTIVE_LOW>;
+		};
+
+		fm2018_pwd {
+			gpio-export,name = "fm2018_pwd";
+			gpio-export,output = <1>;
+			gpios = <&gpio_expander0 4 GPIO_ACTIVE_LOW>;
+		};
+
+		fm2018_reset {
+			gpio-export,name = "fm2018_reset";
+			gpio-export,output = <1>;
+			gpios = <&gpio_expander0 5 GPIO_ACTIVE_LOW>;
+		};
+
+		batt_teset {
+			gpio-export,name = "batt_test";
+			gpio-export,output = <1>;
+			gpios = <&gpio_expander0 6 GPIO_ACTIVE_LOW>;
+		};
+
+		mfi_reset {
+			gpio-export,name = "mfi_reset";
+			gpio-export,output = <1>;
+			gpios = <&gpio_expander0 7 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&ethernet {
+	pinctrl-0 = <&mdio_pins>, <&rgmii1_pins>;
+};
+
+&gmac0 {
+	nvmem-cells = <&macaddr_factory_e000>;
+	nvmem-cell-names = "mac-address";
+};
+
+&nand {
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x80000>;
+			read-only;
+		};
+
+		partition@80000 {
+			label = "config";
+			reg = <0x80000 0x80000>;
+			read-only;
+		};
+
+		factory: partition@100000 {
+			label = "factory";
+			reg = <0x100000 0x40000>;
+		};
+
+		partition@140000 {
+			label = "kernel1";
+			reg = <0x140000 0x1400000>;
+		};
+
+		partition@1540000 {
+			label = "kernel";
+			reg = <0x1540000 0x400000>;
+		};
+
+		partition@1940000 {
+			label = "ubi";
+			reg = <0x1940000 0x1000000>;
+		};
+
+		partition@2940000 {
+			label = "user_storage";
+			reg = <0x2940000 0x100000>;
+		};
+
+		partition@2a40000 {
+			label = "data";
+			reg = <0x2a40000 0x1000000>;
+		};
+
+		partition@3a40000 {
+			label = "storage";
+			reg = <0x3a40000 0x3200000>;
+		};
+
+		partition@6c40000 {
+			label = "backup";
+			reg = <0x6c40000 0x1340000>;
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		nvmem-cells = <&macaddr_factory_e000>;
+		nvmem-cell-names = "mac-address";
+		mac-address-increment = <1>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};
+
+&pcie1 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0000>;
+		nvmem-cells = <&macaddr_factory_e000>;
+		nvmem-cell-names = "mac-address";
+		mac-address-increment = <2>;
+		ieee80211-freq-limit = <2400000 2500000>;
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "jtag", "rgmii2";
+		function = "gpio";
+	};
+};
+
+&i2c {
+	status = "okay";
+
+	/* This GPIO expander is fake. The kernel fails to initialize the
+	   first expander, but succeeds on the second (real) one */
+	gpio_expander2: gpio-expander2@22 {
+		#gpio-cells = <2>;
+		#interrupt-cells = <2>;
+		compatible = "semtech,sx1502q";
+		reg = <0x22>;
+
+		gpio-controller;
+	};
+
+	gpio_expander0: gpio-expander0@20 {
+		#gpio-cells = <2>;
+		#interrupt-cells = <2>;
+		compatible = "semtech,sx1502q";
+		reg = <0x20>;
+
+		gpio-controller;
+	};
+
+	gpio_expander1: gpio-expander1@21 {
+		#gpio-cells = <2>;
+		#interrupt-cells = <2>;
+		compatible = "semtech,sx1502q";
+		reg = <0x21>;
+
+		gpio-controller;
+	};
+};
+
+&switch0 {
+	ports {
+		port@4 {
+			status = "okay";
+			label = "lan";
+		};
+	};
+};
+
+&uartlite2 {
+	status = "okay";
+};
+
+&factory {
+	compatible = "nvmem-cells";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	macaddr_factory_e000: macaddr@e000 {
+		reg = <0xe000 0x6>;
+	};
+};
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 44eec74cab..de9e78a07b 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -1471,6 +1471,21 @@ define Device/sercomm_na502
 endef
 TARGET_DEVICES += sercomm_na502
 
+define Device/sercomm_na502s
+  $(Device/uimage-lzma-loader)
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  IMAGE_SIZE := 20971520
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+  UBINIZE_OPTS := -E 5
+  KERNEL_SIZE := 4096k
+  DEVICE_VENDOR := SERCOMM
+  DEVICE_MODEL := NA502S
+  DEVICE_PACKAGES := kmod-mt76x2 kmod-mt7603 kmod-usb3 kmod-usb-serial \
+  		kmod-usb-serial-xr_usb_serial_common
+endef
+TARGET_DEVICES += sercomm_na502s
+
 define Device/storylink_sap-g3200u3
   $(Device/dsa-migration)
   IMAGE_SIZE := 7872k
diff --git a/target/linux/ramips/mt7621/base-files/etc/board.d/02_network b/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
index 688c39940d..a8d8b8eef2 100644
--- a/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
+++ b/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
@@ -13,6 +13,7 @@ ramips_setup_interfaces()
 	mikrotik,routerboard-m11g|\
 	netgear,ex6150|\
 	sercomm,na502|\
+	sercomm,na502s|\
 	thunder,timecloud|\
 	tplink,re350-v1|\
 	tplink,re500-v1|\
diff --git a/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh b/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
index c818c7e7cc..407611a6a2 100755
--- a/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
@@ -84,6 +84,7 @@ platform_do_upgrade() {
 	netis,wf2881|\
 	raisecom,msg1500-x-00|\
 	sercomm,na502|\
+	sercomm,na502s|\
 	xiaomi,mi-router-3g|\
 	xiaomi,mi-router-3-pro|\
 	xiaomi,mi-router-4|\