ARM: dts: r8a7792: add MSIOF clocks

Describe the MSIOF0/1 clocks and their parent, MP clock in the R8A7792
device  tree.

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

@@ -763,6 +763,13 @@ cp_clk: cp {
 			clock-div = <48>;
 			clock-mult = <1>;
 		};
+		mp_clk: mp {
+			compatible = "fixed-factor-clock";
+			clocks = <&pll1_div2_clk>;
+			#clock-cells = <0>;
+			clock-div = <15>;
+			clock-mult = <1>;
+		};
 		m2_clk: m2 {
 			compatible = "fixed-factor-clock";
 			clocks = <&cpg_clocks R8A7792_CLK_PLL1>;
@@ -793,6 +800,15 @@ zg_clk: zg {
 		};
 
 		/* Gate clocks */
+		mstp0_clks: mstp0_clks@e6150130 {
+			compatible = "renesas,r8a7792-mstp-clocks",
+				     "renesas,cpg-mstp-clocks";
+			reg = <0 0xe6150130 0 4>, <0 0xe6150030 0 4>;
+			clocks = <&mp_clk>;
+			#clock-cells = <1>;
+			clock-indices = <R8A7792_CLK_MSIOF0>;
+			clock-output-names = "msiof0";
+		};
 		mstp1_clks: mstp1_clks@e6150134 {
 			compatible = "renesas,r8a7792-mstp-clocks",
 				     "renesas,cpg-mstp-clocks";
@@ -811,12 +827,13 @@ mstp2_clks: mstp2_clks@e6150138 {
 			compatible = "renesas,r8a7792-mstp-clocks",
 				     "renesas,cpg-mstp-clocks";
 			reg = <0 0xe6150138 0 4>, <0 0xe6150040 0 4>;
-			clocks = <&zs_clk>, <&zs_clk>;
+			clocks = <&mp_clk>, <&zs_clk>, <&zs_clk>;
 			#clock-cells = <1>;
 			clock-indices = <
+				R8A7792_CLK_MSIOF1
 				R8A7792_CLK_SYS_DMAC1 R8A7792_CLK_SYS_DMAC0
 			>;
-			clock-output-names = "sys-dmac1", "sys-dmac0";
+			clock-output-names = "msiof1", "sys-dmac1", "sys-dmac0";
 		};
 		mstp3_clks: mstp3_clks@e615013c {
 			compatible = "renesas,r8a7792-mstp-clocks",