rtl838x: add new architecture

This adds support for the RTL838x Architecture.
SoCs of this type are used in managed and un-managed Switches and Routers
with 8-28 ports. Drivers are provided for SoC initialization, GPIOs, Flash,
Ethernet including a DSA switch driver and internal and external PHYs used
with these switches.

Supported SoCs:

	RTL8380M
	RTL8381M
	RTL8382M

The kernel will also boot on the following RTL839x SoCs, however driver
support apart from spi-nor is missing:

	RTL8390
	RTL8391
	RTL8393

The following PHYs are supported:

	RTL8214FC (Quad QSGMII multiplexing GMAC and SFP port)
	RTL8218B internal: internal PHY of the RTL838x chips
	RTL8318b external (QSGMII 8-port GMAC phy)
	RTL8382M SerDes for 2 SFP ports
	Initialization sequences for the PHYs are provided in the form of
	firmware files.

Flash driver supports 3 / 4 byte access

DSA switch driver supports VLANs, port isolation, STP and port mirroring.

The ALLNET ALL-SG8208M is supported as Proof of Concept:

	RTL8382M SoC
	1 MIPS 4KEc core @ 500MHz
	8 Internal PHYs (RTL8218B)
	128MB DRAM (Nanya NT5TU128MB)
	16MB NOR Flash (MXIC 25L128)
	8 GBEthernet ports with one green status LED each (SoC controlled)
	1 Power LED (not configurable)
	1 SYS LED (configurable)
	1 On-Off switch (not configurable)
	1 Reset button at the right behind right air-vent (not configurable)
	1 Reset button on front panel (configurable)
	12V 1A barrel connector
	1 serial header with populated standard pin connector and with markings
	  GND TX RX Vcc(3.3V), connection properties: 115200 8N1

To install, upload the sysupgrade image to the OEM webpage.

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

1 files changed, 110 insertions, 0 deletions

diff --git a/target/linux/rtl838x/dts/rtl838x.dtsi b/target/linux/rtl838x/dts/rtl838x.dtsi
new file mode 100644
index 0000000000..63dc9bf1ba
--- /dev/null
+++ b/target/linux/rtl838x/dts/rtl838x.dtsi
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	compatible = "realtek,rtl838x-soc";
+	reg = <0xbb000000 0xa000>;
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		frequency = <500000000>;
+
+		cpu@0 {
+			compatible = "mips,mips4KEc";
+			reg = <0>;
+		};
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x8000000>;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,38400";
+	};
+
+	cpuintc: cpuintc {
+		#address-cells = <0>;
+		#interrupt-cells = <1>;
+		interrupt-controller;
+		compatible = "rtl838x,icu";
+		reg = <0xb8003000 0x20>;
+	};
+
+	spi0: spi@b8001200 {
+		status = "okay";
+
+		compatible = "realtek,rtl838x-nor";
+		reg = <0xb8001200 0x100>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+
+	uart0: uart@b8002000 {
+		status = "disabled";
+
+		compatible = "ns16550a";
+		reg = <0xb8002000 0x100>;
+
+		clock-frequency = <200000000>;
+		interrupts = <31>;
+
+		reg-io-width = <1>;
+		reg-shift = <2>;
+		fifo-size = <1>;
+		no-loopback-test;
+	};
+
+	uart1: uart@b8002100 {
+		status = "okay";
+
+		compatible = "ns16550a";
+		reg = <0xb8002100 0x100>;
+
+		clock-frequency = <200000000>;
+
+		interrupt-parent = <&cpuintc>;
+		interrupts = <30>;
+
+		reg-io-width = <1>;
+		reg-shift = <2>;
+		fifo-size = <1>;
+		no-loopback-test;
+	};
+
+	gpio0: gpio-controller@b8003500 {
+		compatible = "realtek,rtl838x-gpio";
+		reg = <0xb8003500 0x20>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		interrupt-parent = <&cpuintc>;
+		interrupts = <23>;
+	};
+
+	ethernet0: ethernet@bb00a300 {
+		status = "okay";
+
+		compatible = "realtek,rtl838x-eth";
+		reg = <0xbb00a300 0x100>;
+		interrupt-parent = <&cpuintc>;
+		interrupts = <24>;
+		#interrupt-cells = <1>;
+		phy-mode = "internal";
+
+		fixed-link {
+			speed = <1000>;
+			full-duplex;
+		};
+	};
+
+	switch0: switch@bb000000 {
+		status = "okay";
+
+		compatible = "realtek,rtl838x-switch";
+	};
+};