ARM: dts: r8a77470: Add SMP support

Add DT node for the Advanced Power Management Unit (APMU), add the
second CPU core, and use "renesas,apmu" as "enable-method".
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a77470.dtsi

@@ -17,6 +17,7 @@ / {
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
+		enable-method = "renesas,apmu";
 
 		cpu0: cpu@0 {
 			device_type = "cpu";
@@ -28,6 +29,15 @@ cpu0: cpu@0 {
 			next-level-cache = <&L2_CA7>;
 		};
 
+		cpu1: cpu@1 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a7";
+			reg = <1>;
+			clock-frequency = <1000000000>;
+			clocks = <&cpg CPG_CORE R8A77470_CLK_Z2>;
+			power-domains = <&sysc R8A77470_PD_CA7_CPU1>;
+			next-level-cache = <&L2_CA7>;
+		};
 
 		L2_CA7: cache-controller-0 {
 			compatible = "cache";
@@ -167,6 +177,12 @@ cpg: clock-controller@e6150000 {
 			#reset-cells = <1>;
 		};
 
+		apmu@e6151000 {
+			compatible = "renesas,r8a77470-apmu", "renesas,apmu";
+			reg = <0 0xe6151000 0 0x188>;
+			cpus = <&cpu0 &cpu1>;
+		};
+
 		rst: reset-controller@e6160000 {
 			compatible = "renesas,r8a77470-rst";
 			reg = <0 0xe6160000 0 0x100>;