spi: initial spi device support

etc/dtb/aarch64/bcm2711-rpi-4-b.dts

@@ -190,6 +190,16 @@
 				brcm,function = <2>;
 				brcm,pull = <2>;
 			};
+
+            // SPI
+            spi0_gpio: spi0_pins {
+				brcm,pins = <9>, <10>, <11>;
+				brcm,function = <4>;
+			};
+			spi0_cs_gpio: spi0_cs_pins {
+				brcm,pins = <8>, <7>;
+				brcm,function = <1>;
+			};
 		};
 
 		uart0: serial@7e201000 {
@@ -322,6 +332,38 @@
 			pinctrl-names = "default";
 		};
 
+        spi0: spi@7e204000 {
+			compatible = "brcm,bcm2835-spi";
+			reg = <0x7e204000 0x200>;
+			interrupts = <GIC_SPI 118 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cprman 0x14>;
+			#address-cells = <0x01>;
+			#size-cells = <0x00>;
+			status = "okay";
+			dmas = <&dma 0x06>,
+                   <&dma 0x07>;
+			dma-names = "tx", "rx";
+			pinctrl-names = "default";
+			pinctrl-0 = <&spi0_gpio>, <&spi0_cs_gpio>;
+			cs-gpios = <&gpio 8 1>, <&gpio 7 1>;
+
+			spi0_0: spidev@0 {
+				compatible = "spidev";
+				reg = <0x00>;
+				#address-cells = <0x01>;
+				#size-cells = <0x00>;
+				spi-max-frequency = <125000000>;
+			};
+
+			spi0_1: spidev@1 {
+				compatible = "spidev";
+				reg = <0x01>;
+				#address-cells = <0x01>;
+				#size-cells = <0x00>;
+				spi-max-frequency = <125000000>;
+			};
+		};
+
 		l1_intc: local_intc@40000000 {
 			compatible = "brcm,bcm2836-l1-intc";
 			reg = <0x40000000 0x100>;