ARM: dts: r8a7794: Add INTC-SYS clock to device tree

Link the ARM GIC to the INTC-SYS module clock, and add it to the "always
on" PM Domain, so it can be power managed using that clock.

Note that currently the GIC-400 driver doesn't support module clocks nor
Runtime PM, so this must be handled as a critical 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

@@ -74,6 +74,9 @@
 			<0 0xf1004000 0 0x2000>,
 			<0 0xf1006000 0 0x2000>;
 		interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_HIGH)>;
+		clocks = <&mstp4_clks R8A7794_CLK_INTC_SYS>;
+		clock-names = "clk";
+		power-domains = <&sysc R8A7794_PD_ALWAYS_ON>;
 	};
 
 	gpio0: gpio@e6050000 {
@@ -1247,10 +1250,10 @@
 		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>;
+			clocks = <&cp_clk>, <&zs_clk>;
 			#clock-cells = <1>;
-			clock-indices = <R8A7794_CLK_IRQC>;
-			clock-output-names = "irqc";
+			clock-indices = <R8A7794_CLK_IRQC R8A7794_CLK_INTC_SYS>;
+			clock-output-names = "irqc", "intc-sys";
 		};
 		mstp5_clks: mstp5_clks@e6150144 {
 			compatible = "renesas,r8a7794-mstp-clocks", "renesas,cpg-mstp-clocks";

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

@@ -64,6 +64,7 @@
 
 /* MSTP4 */
 #define R8A7794_CLK_IRQC		7
+#define R8A7794_CLK_INTC_SYS		8
 
 /* MSTP5 */
 #define R8A7794_CLK_AUDIO_DMAC0		2