ARM: dts: r8a7792: add MSIOF support

Define the generic R8A7792 parts of the MSIOF0/1 device nodes.

Based  on the original (and large) patch by Vladimir Barinov
<vladimir.barinov@cogentembedded.com>.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7792.dtsi

@@ -26,6 +26,8 @@ aliases {
 		i2c4 = &i2c4;
 		i2c5 = &i2c5;
 		spi0 = &qspi;
+		spi1 = &msiof0;
+		spi2 = &msiof1;
 		vin0 = &vin0;
 		vin1 = &vin1;
 		vin2 = &vin2;
@@ -572,6 +574,34 @@ qspi: spi@e6b10000 {
 			status = "disabled";
 		};
 
+		msiof0: spi@e6e20000 {
+			compatible = "renesas,msiof-r8a7792";
+			reg = <0 0xe6e20000 0 0x0064>;
+			interrupts = <GIC_SPI 156 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&mstp0_clks R8A7792_CLK_MSIOF0>;
+			dmas = <&dmac0 0x51>, <&dmac0 0x52>,
+			       <&dmac1 0x51>, <&dmac1 0x52>;
+			dma-names = "tx", "rx", "tx", "rx";
+			power-domains = <&sysc R8A7792_PD_ALWAYS_ON>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+		};
+
+		msiof1: spi@e6e10000 {
+			compatible = "renesas,msiof-r8a7792";
+			reg = <0 0xe6e10000 0 0x0064>;
+			interrupts = <GIC_SPI 157 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&mstp2_clks R8A7792_CLK_MSIOF1>;
+			dmas = <&dmac0 0x55>, <&dmac0 0x56>,
+			       <&dmac1 0x55>, <&dmac1 0x56>;
+			dma-names = "tx", "rx", "tx", "rx";
+			power-domains = <&sysc R8A7792_PD_ALWAYS_ON>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+		};
+
 		du: display@feb00000 {
 			compatible = "renesas,du-r8a7792";
 			reg = <0 0xfeb00000 0 0x40000>;