mips: bmips: add bcm63xx-spi driver support for BCM6338

This driver manages the SPI controller present on this SoC.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/mips/dts/brcm,bcm6338.dtsi b/arch/mips/dts/brcm,bcm6338.dtsi
index eb51a43..0cab44c 100644
--- a/arch/mips/dts/brcm,bcm6338.dtsi
+++ b/arch/mips/dts/brcm,bcm6338.dtsi
@@ -12,6 +12,10 @@
 / {
 	compatible = "brcm,bcm6338";
 
+	aliases {
+		spi0 = &spi;
+	};
+
 	cpus {
 		reg = <0xfffe0000 0x4>;
 		#address-cells = <1>;
@@ -109,6 +113,19 @@
 			status = "disabled";
 		};
 
+		spi: spi@fffe0c00 {
+			compatible = "brcm,bcm6348-spi";
+			reg = <0xfffe0c00 0xc0>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			clocks = <&periph_clk BCM6338_CLK_SPI>;
+			resets = <&periph_rst BCM6338_RST_SPI>;
+			spi-max-frequency = <20000000>;
+			num-cs = <4>;
+
+			status = "disabled";
+		};
+
 		memory-controller@fffe3100 {
 			compatible = "brcm,bcm6338-mc";
 			reg = <0xfffe3100 0x38>;