[PATCH v2] riscv: sophgo: dts: Add spi controller for SG2042

[Zixian Zeng <sycamoremoon376@gmail.com>]

Add spi controllers for SG2042.

SG2042 uses the upstreamed Synopsys DW SPI IP.

Signed-off-by: Zixian Zeng <sycamoremoon376@gmail.com>
---
For this spi controller patch, only bindings are included.
This is tested on milkv-pioneer board. Using driver/spi/spidev.c
for creating /dev/spidevX.Y and tools/spi/spidev_test for testing
functionality.
---
Changes in v2:
- rebase v1 to sophgo/master(github.com/sophgo/linux.git).
- order properties in device node.
- remove unevaluated properties `clock-frequency`.
- set default status to disable.
- Link to v1: https://lore.kernel.org/r/20250228-sfg-spi-v1-1-b989aed94911@gmail.com
---
 .../riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts |  8 +++++++
 arch/riscv/boot/dts/sophgo/sg2042.dtsi             | 28 ++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts b/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
index be596d01ff8d33bcdbe431d9731a55ee190ad5b3..c43a807af2f827b5267afe5e4fdf6e9e857dfa20 100644
--- a/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
+++ b/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
@@ -72,6 +72,14 @@ &uart0 {
 	status = "okay";
 };
 
+&spi0 {
+	status = "okay";
+};
+
+&spi1 {
+	status = "okay";
+};
+
 / {
 	thermal-zones {
 		soc-thermal {
diff --git a/arch/riscv/boot/dts/sophgo/sg2042.dtsi b/arch/riscv/boot/dts/sophgo/sg2042.dtsi
index e62ac51ac55abd922b5ef796ba8c2196383850c4..500645147b1f8ed0a08ad3cafb38ea79cf57d737 100644
--- a/arch/riscv/boot/dts/sophgo/sg2042.dtsi
+++ b/arch/riscv/boot/dts/sophgo/sg2042.dtsi
@@ -545,5 +545,33 @@ sd: mmc@704002b000 {
 				      "timer";
 			status = "disabled";
 		};
+
+		spi0: spi@7040004000 {
+			compatible = "snps,dw-apb-ssi";
+			reg = <0x70 0x40004000 0x00 0x1000>;
+			clocks = <&clkgen GATE_CLK_APB_SPI>,
+					<&clkgen GATE_CLK_SYSDMA_AXI>;
+			interrupt-parent = <&intc>;
+			interrupts = <110 IRQ_TYPE_LEVEL_HIGH>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			num-cs = <0x02>;
+			resets = <&rstgen RST_SPI0>;
+			status = "disabled";
+		};
+
+		spi1: spi@7040005000 {
+			compatible = "snps,dw-apb-ssi";
+			reg = <0x70 0x40005000 0x00 0x1000>;
+			clocks = <&clkgen GATE_CLK_APB_SPI>,
+					<&clkgen GATE_CLK_SYSDMA_AXI>;
+			interrupt-parent = <&intc>;
+			interrupts = <111 IRQ_TYPE_LEVEL_HIGH>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			num-cs = <0x02>;
+			resets = <&rstgen RST_SPI1>;
+			status = "disabled";
+		};
 	};
 };

---
base-commit: aa5ee7180ec41bb77c3e327e95d119f2294babea
change-id: 20250228-sfg-spi-e3f2aeca09ab

Best regards,
-- 
Zixian Zeng <sycamoremoon376@gmail.com>