[PATCH RFC] arm64: dts: sophgo: Add initial SG2000 SoC device tree

[Alexander Sverdlin <alexander.sverdlin@gmail.com>]

Add initial device tree for the SG2000 SoC by SOPHGO (from ARM64 PoV).

---
Dear ARM, RISCV, DT maintainers, I'd like to ask your opinion on the
below patch, which I plan as a base for ARM64 BSP for dual-arch (RISCV or
ARM64) Cvitek SoC SG2000. The main motivation for ARM64 support is the
ARCH support in the upstream gcc, which is not that mature for RISCV.

I believe it's the first time we already have quite some base in the
tree for a SoC, so it would be advantageous to re-use it and not
duplicate the same SoC structures in two places, especially having
in mind that Cvitek/Sophgo are still working on upstreaming and by
far not all HW blocks are populated in the SoC DTs. They focus primarely
on RISCV, so ARM64 would be dragging behind in this case if it would be
forked.

On the other hand, including SoC dtsi from RISCV into ARM64 poses
some technical challenges by itself, obviously CPU cores have to be
deleted, same is true for interrupt controller. And the interrupt
numbers are of course difference for ARM GIC, so they have to be
overwritten.

Alternatively I can split existing .dtsi included below into their
RISCV-specific and generic parts, so that both ARM64 and RISCV would
include generic part and their corresponding ARCH-specific parts
bringing CPU cores + interrupt controller + IRQ numbers for each and
every device separately.

The below example isactually booting (being included into board-level
DT), so it's a real example I'd be ready to submit if there will be
no objections of the cross-ARCH include approach in general.

What are your thoughts?

 arch/arm64/boot/dts/sophgo/sg2000.dtsi | 164 +++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 arch/arm64/boot/dts/sophgo/sg2000.dtsi

diff --git a/arch/arm64/boot/dts/sophgo/sg2000.dtsi b/arch/arm64/boot/dts/sophgo/sg2000.dtsi
new file mode 100644
index 000000000000..96afd342bde5
--- /dev/null
+++ b/arch/arm64/boot/dts/sophgo/sg2000.dtsi
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include "../../../../riscv/boot/dts/sophgo/cv18xx.dtsi"
+#include "../../../../riscv/boot/dts/sophgo/cv181x.dtsi"
+
+/delete-node/ &cpu0;
+/delete-node/ &plic;
+/delete-node/ &clint;
+
+/ {
+	compatible = "sophgo,sg2000";
+	interrupt-parent = <&gic>;
+
+	memory@80000000 {
+		device_type = "memory";
+		reg = <0x80000000 0x20000000>;	/* 512MiB */
+	};
+
+	pmu {
+		compatible = "arm,cortex-a53-pmu";
+		interrupts = <GIC_SPI 119 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	timer {
+		compatible = "arm,armv8-timer";
+		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>;
+		always-on;
+		clock-frequency = <25000000>;
+	};
+
+	gic: interrupt-controller@1f01000 {
+		compatible = "arm,cortex-a15-gic";
+		interrupt-controller;
+		#interrupt-cells = <3>;
+		reg = <0x01f01000 0x1000>,
+		      <0x01f02000 0x2000>;
+	};
+
+	soc {
+		/delete-property/ interrupt-parent;
+
+		pinctrl: pinctrl@3001000 {
+			compatible = "sophgo,sg2000-pinctrl";
+			reg = <0x03001000 0x1000>,
+			      <0x05027000 0x1000>;
+			reg-names = "sys", "rtc";
+		};
+	};
+};
+
+&cpus {
+	cpu0: cpu@0 {
+		compatible = "arm,cortex-a53";
+		device_type = "cpu";
+		reg = <0>;
+		enable-method = "psci";
+		next-level-cache = <&l2>;
+	};
+
+	l2: l2-cache {
+		compatible = "cache";
+	};
+};
+
+&clk {
+	compatible = "sophgo,sg2000-clk";
+};
+
+&saradc {
+	interrupts = <GIC_SPI 84 IRQ_TYPE_EDGE_RISING>;
+};
+
+&dmac {
+	interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&spi0 {
+	interrupts = <GIC_SPI 38 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&spi1 {
+	interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&spi2 {
+	interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&spi3 {
+	interrupts = <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&uart0 {
+	interrupts = <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&uart1 {
+	interrupts = <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&uart2 {
+	interrupts = <GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&uart3 {
+	interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&uart4 {
+	interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&porta {
+	interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&portb {
+	interrupts = <GIC_SPI 45 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&portc {
+	interrupts = <GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&portd {
+	interrupts = <GIC_SPI 47 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&i2c0 {
+	interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&i2c1 {
+	interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&i2c2 {
+	interrupts = <GIC_SPI 35 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&i2c3 {
+	interrupts = <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&i2c4 {
+	interrupts = <GIC_SPI 37 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&emmc {
+	interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&sdhci0 {
+	interrupts = <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&sdhci1 {
+	interrupts = <GIC_SPI 22 IRQ_TYPE_LEVEL_HIGH>;
+};

-- 
Alexander Sverdlin.