ARM: shmobile: r8a7794: Add IRQC clock to device tree

Link the external IRQ controller irqc0 to the IRQC module clock, so it
can be power managed using that clock.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7794.dtsi

@@ -105,6 +105,7 @@ irqc0: interrupt-controller@e61c0000 {
 			     <0 15 IRQ_TYPE_LEVEL_HIGH>,
 			     <0 16 IRQ_TYPE_LEVEL_HIGH>,
 			     <0 17 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&mstp4_clks R8A7794_CLK_IRQC>;
 	};
 
 	dmac0: dma-controller@e6700000 {
@@ -625,6 +626,14 @@ R8A7794_CLK_USBDMAC0 R8A7794_CLK_USBDMAC1
 			        "sdhi2", "sdhi1", "sdhi0",
 				"mmcif0", "cmt1", "usbdmac0", "usbdmac1";
 		};
+		mstp4_clks: mstp4_clks@e6150140 {
+			compatible = "renesas,r8a7794-mstp-clocks", "renesas,cpg-mstp-clocks";
+			reg = <0 0xe6150140 0 4>, <0 0xe615004c 0 4>;
+			clocks = <&cp_clk>;
+			#clock-cells = <1>;
+			clock-indices = <R8A7794_CLK_IRQC>;
+			clock-output-names = "irqc";
+		};
 		mstp7_clks: mstp7_clks@e615014c {
 			compatible = "renesas,r8a7794-mstp-clocks", "renesas,cpg-mstp-clocks";
 			reg = <0 0xe615014c 0 4>, <0 0xe61501c4 0 4>;

include/dt-bindings/clock/r8a7794-clock.h

@@ -60,6 +60,9 @@
 #define R8A7794_CLK_USBDMAC0		30
 #define R8A7794_CLK_USBDMAC1		31
 
+/* MSTP4 */
+#define R8A7794_CLK_IRQC		7
+
 /* MSTP5 */
 #define R8A7794_CLK_THERMAL		22
 #define R8A7794_CLK_PWM			23