realtek: Add support for ZyXEL GS1900-48 Switch

The GS1900-48 is a 48 + 2 port Gigabit L2 switch with 48 gigabit ports.
Hardware:
    RTL8393M SoC
    Macronix MX25l12805D (16MB flash)
    128MB RAM
    6 * RTL8218B external PHY
    2 * RTL8231 GPIO extenders to control the port LEDs, system LED and
    Reset button

2 Uplink ports are SFP cages which support 1000 Base-X mini GBIC modules.

Power is supplied via a 230 volt mains connector.
The board has a hard reset switch SW1, which is is not reachable from the outside.
J4 provides a 12V RS232 serial connector which is connected through U8 to
the 3.3V UART of the RTL8393. Conversion is done by U8, a SIPEX 3232EC.
To connect to the UART, wires can be soldered to R603 (TX)  and R602 (RX).

Installation:
Install the squashfs image via Realtek's original Web-Interface.

Signed-off-by: Birger Koblitz <git@birger-koblitz.de>

3 files changed, 340 insertions, 1 deletions

diff --git a/target/linux/realtek/Makefile b/target/linux/realtek/Makefile
index 39d9d35f7f..b9063eb73a 100644
--- a/target/linux/realtek/Makefile
+++ b/target/linux/realtek/Makefile
@@ -7,7 +7,7 @@ BOARD:=realtek
 BOARDNAME:=Realtek MIPS
 DEVICE_TYPE:=basic
 FEATURES:=ramdisk squashfs
-SUBTARGETS:=rtl838x
+SUBTARGETS:=rtl838x rtl839x
 
 KERNEL_PATCHVER:=5.10
 
diff --git a/target/linux/realtek/dts-5.10/rtl8393_zyxel_gs1900-48.dts b/target/linux/realtek/dts-5.10/rtl8393_zyxel_gs1900-48.dts
new file mode 100644
index 0000000000..f72b654b57
--- /dev/null
+++ b/target/linux/realtek/dts-5.10/rtl8393_zyxel_gs1900-48.dts
@@ -0,0 +1,326 @@
+/dts-v1/;
+
+#include "rtl839x.dtsi"
+
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	compatible = "zyxel,gs1900-48", "realtek,rtl8393-soc";
+	model = "Zyxel GS1900-48";
+
+	aliases {
+		led-boot = &led_sys;
+		led-failsafe = &led_sys;
+		led-running = &led_sys;
+		led-upgrade = &led_sys;
+	};	
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x8000000>;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	leds {
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinmux_disable_sys_led>;
+		compatible = "gpio-leds";
+
+		led_sys: sys {
+			label = "green:sys";
+			gpios = <&gpio0 0 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	gpio1: rtl8231-gpio {
+		compatible = "realtek,rtl8231-gpio";
+		#gpio-cells = <2>;
+		indirect-access-bus-id = <3>;
+		gpio-controller;
+
+		status = "okay";
+	};
+
+	gpio-restart {
+		compatible = "gpio-restart";
+		gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
+	};
+
+	keys {
+		compatible = "gpio-keys-polled";
+		poll-interval = <20>;
+
+		mode {
+			label = "reset";
+			gpios = <&gpio1 3 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	/* i2c of the left SFP cage: port 49 */
+	i2c0: i2c-gpio-0 {
+		compatible = "i2c-gpio";
+		sda-gpios = <&gpio1 24 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&gpio1 25 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		i2c-gpio,delay-us = <2>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+
+	sfp0: sfp-p9 {
+		compatible = "sff,sfp";
+		i2c-bus = <&i2c0>;
+		los-gpio = <&gpio1 27 GPIO_ACTIVE_HIGH>;
+		tx-fault-gpio = <&gpio1 22 GPIO_ACTIVE_HIGH>;
+		mod-def0-gpio = <&gpio1 26 GPIO_ACTIVE_LOW>;
+		tx-disable-gpio = <&gpio1 23 GPIO_ACTIVE_HIGH>;
+	};
+
+	/* i2c of the right SFP cage: port 50 */
+	i2c1: i2c-gpio-1 {
+		compatible = "i2c-gpio";
+		sda-gpios = <&gpio1 30 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&gpio1 31 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		i2c-gpio,delay-us = <2>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+
+	sfp1: sfp-p10 {
+		compatible = "sff,sfp";
+		i2c-bus = <&i2c1>;
+		los-gpio = <&gpio1 33 GPIO_ACTIVE_HIGH>;
+		tx-fault-gpio = <&gpio1 28 GPIO_ACTIVE_HIGH>;
+		mod-def0-gpio = <&gpio1 32 GPIO_ACTIVE_LOW>;
+		tx-disable-gpio = <&gpio1 29 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+&spi0 {
+	status = "okay";
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x40000>;
+				read-only;
+			};
+			partition@40000 {
+				label = "u-boot-env";
+				reg = <0x40000 0x10000>;
+				read-only;
+			};
+			partition@50000 {
+				label = "u-boot-env2";
+				reg = <0x50000 0x10000>;
+				read-only;
+			};
+			partition@60000 {
+				label = "jffs";
+				reg = <0x60000 0x100000>;
+			};
+			partition@160000 {
+				label = "jffs2";
+				reg = <0x160000 0x100000>;
+			};
+			partition@b260000 {
+				label = "firmware";
+				reg = <0x260000 0xda0000>;
+				compatible = "openwrt,uimage", "denx,uimage";
+				openwrt,ih-magic = <0x83800000>;
+			};
+			partition@930000 {
+				label = "runtime2";
+				reg = <0x930000 0x6d0000>;
+			};
+		};
+	};
+};
+
+&ethernet0 {
+	mdio: mdio-bus {
+		compatible = "realtek,rtl838x-mdio";
+		regmap = <&ethernet0>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		
+		/* External phy RTL8218B #1 */
+		EXTERNAL_PHY(0)
+		EXTERNAL_PHY(1)
+		EXTERNAL_PHY(2)
+		EXTERNAL_PHY(3)
+		EXTERNAL_PHY(4)
+		EXTERNAL_PHY(5)
+		EXTERNAL_PHY(6)
+		EXTERNAL_PHY(7)
+
+		/* External phy RTL8218B #2 */
+		EXTERNAL_PHY(8)
+		EXTERNAL_PHY(9)
+		EXTERNAL_PHY(10)
+		EXTERNAL_PHY(11)
+		EXTERNAL_PHY(12)
+		EXTERNAL_PHY(13)
+		EXTERNAL_PHY(14)
+		EXTERNAL_PHY(15)
+
+		/* External phy RTL8218B #3 */
+		EXTERNAL_PHY(16)
+		EXTERNAL_PHY(17)
+		EXTERNAL_PHY(18)
+		EXTERNAL_PHY(19)
+		EXTERNAL_PHY(20)
+		EXTERNAL_PHY(21)
+		EXTERNAL_PHY(22)
+		EXTERNAL_PHY(23)
+
+		/* External phy RTL8218B #4 */
+		EXTERNAL_PHY(24)
+		EXTERNAL_PHY(25)
+		EXTERNAL_PHY(26)
+		EXTERNAL_PHY(27)
+		EXTERNAL_PHY(28)
+		EXTERNAL_PHY(29)
+		EXTERNAL_PHY(30)
+		EXTERNAL_PHY(31)
+
+		/* External phy RTL8218B #5 */
+		EXTERNAL_PHY(32)
+		EXTERNAL_PHY(33)
+		EXTERNAL_PHY(34)
+		EXTERNAL_PHY(35)
+		EXTERNAL_PHY(36)
+		EXTERNAL_PHY(37)
+		EXTERNAL_PHY(38)
+		EXTERNAL_PHY(39)
+
+		/* External phy RTL8218B #6 */
+		EXTERNAL_PHY(40)
+		EXTERNAL_PHY(41)
+		EXTERNAL_PHY(42)
+		EXTERNAL_PHY(43)
+		EXTERNAL_PHY(44)
+		EXTERNAL_PHY(45)
+		EXTERNAL_PHY(46)
+		EXTERNAL_PHY(47)
+
+		/* RTL8393 Internal SerDes */
+		INTERNAL_PHY(48)
+		INTERNAL_PHY(49)
+	};
+};
+
+&switch0 {
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		SWITCH_PORT(0, 01, qsgmii)
+		SWITCH_PORT(1, 02, qsgmii)
+		SWITCH_PORT(2, 03, qsgmii)
+		SWITCH_PORT(3, 04, qsgmii)
+		SWITCH_PORT(4, 05, qsgmii)
+		SWITCH_PORT(5, 06, qsgmii)
+		SWITCH_PORT(6, 07, qsgmii)
+		SWITCH_PORT(7, 08, qsgmii)
+
+		SWITCH_PORT(8, 09, qsgmii)
+		SWITCH_PORT(9, 10, qsgmii)
+		SWITCH_PORT(10, 11, qsgmii)
+		SWITCH_PORT(11, 12, qsgmii)
+		SWITCH_PORT(12, 13, qsgmii)
+		SWITCH_PORT(13, 14, qsgmii)
+		SWITCH_PORT(14, 15, qsgmii)
+		SWITCH_PORT(15, 16, qsgmii)
+
+		SWITCH_PORT(16, 17, qsgmii)
+		SWITCH_PORT(17, 18, qsgmii)
+		SWITCH_PORT(18, 19, qsgmii)
+		SWITCH_PORT(19, 20, qsgmii)
+		SWITCH_PORT(20, 21, qsgmii)
+		SWITCH_PORT(21, 22, qsgmii)
+		SWITCH_PORT(22, 23, qsgmii)
+		SWITCH_PORT(23, 24, qsgmii)
+
+		SWITCH_PORT(24, 25, qsgmii)
+		SWITCH_PORT(25, 26, qsgmii)
+		SWITCH_PORT(26, 27, qsgmii)
+		SWITCH_PORT(27, 28, qsgmii)
+		SWITCH_PORT(28, 29, qsgmii)
+		SWITCH_PORT(29, 30, qsgmii)
+		SWITCH_PORT(30, 31, qsgmii)
+		SWITCH_PORT(31, 32, qsgmii)
+
+		SWITCH_PORT(32, 33, qsgmii)
+		SWITCH_PORT(33, 34, qsgmii)
+		SWITCH_PORT(34, 35, qsgmii)
+		SWITCH_PORT(35, 36, qsgmii)
+		SWITCH_PORT(36, 37, qsgmii)
+		SWITCH_PORT(37, 38, qsgmii)
+		SWITCH_PORT(38, 39, qsgmii)
+		SWITCH_PORT(39, 40, qsgmii)
+
+		SWITCH_PORT(40, 41, qsgmii)
+		SWITCH_PORT(41, 42, qsgmii)
+		SWITCH_PORT(42, 43, qsgmii)
+		SWITCH_PORT(43, 44, qsgmii)
+		SWITCH_PORT(44, 45, qsgmii)
+		SWITCH_PORT(45, 46, qsgmii)
+		SWITCH_PORT(46, 47, qsgmii)
+		SWITCH_PORT(47, 48, qsgmii)
+
+		/* SFP cages */
+		port@48 {
+			reg = <48>;
+			label = "lan49";
+			phy-mode = "sgmii";
+			phy-handle = <&phy48>;
+			sfp = <&sfp0>;
+
+			fixed-link {
+				speed = <1000>;
+				full-duplex;
+				pause;
+			};
+
+		};
+
+		port@49 {
+			reg = <49>;
+			label = "lan50";
+			phy-mode = "sgmii";
+			phy-handle = <&phy49>;
+			sfp = <&sfp1>;
+
+			fixed-link {
+				speed = <1000>;
+				full-duplex;
+				pause;
+			};
+
+		};
+
+		/* CPU-Port */
+		port@52 {
+			ethernet = <&ethernet0>;
+			reg = <52>;
+			phy-mode = "qsgmii";
+			fixed-link {
+				speed = <1000>;
+				full-duplex;
+			};
+		};
+	};
+};
diff --git a/target/linux/realtek/image/rtl839x.mk b/target/linux/realtek/image/rtl839x.mk
new file mode 100644
index 0000000000..2363b91849
--- /dev/null
+++ b/target/linux/realtek/image/rtl839x.mk
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+define Device/zyxel_gs1900-48
+  SOC := rtl8393
+  IMAGE_SIZE := 13952k
+  DEVICE_VENDOR := ZyXEL
+  UIMAGE_MAGIC := 0x83800000
+  ZYXEL_VERS := AAHO
+  DEVICE_MODEL := GS1900-48
+  KERNEL_INITRAMFS := kernel-bin | append-dtb | gzip | zyxel-vers $$$$(ZYXEL_VERS) | \
+	uImage gzip
+endef
+TARGET_DEVICES += zyxel_gs1900-48