[PATCH] ARM: dts: r8a7794: add SMP support

[Sergei Shtylyov]

Add the device tree node for the Advanced Power Management Unit (APMU).
Use the "enable-method" prop to  point out that the APMU should be used
for the SMP support.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov at cogentembedded.com>

---
This patch is against the 'renesas-devel-20160621-v4.7-rc4' tag of Simon
Horman's 'renesas.git' repo.  It depends on Magnus'/Geert's SMP patchset...

SMP/PM basically works but you can't offline CPU0 (system hangs)...

 arch/arm/boot/dts/r8a7794.dtsi |    7 +++++++
 1 file changed, 7 insertions(+)

Index: renesas/arch/arm/boot/dts/r8a7794.dtsi
===================================================================
--- renesas.orig/arch/arm/boot/dts/r8a7794.dtsi
+++ renesas/arch/arm/boot/dts/r8a7794.dtsi
@@ -37,6 +37,7 @@
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
+		enable-method = "renesas,apmu";
 
 		cpu0: cpu at 0 {
 			device_type = "cpu";
@@ -65,6 +66,12 @@
 		};
 	};
 
+	apmu at e6151000 {
+		compatible = "renesas,r8a7794-apmu", "renesas,apmu";
+		reg = <0 0xe6151000 0 0x188>;
+		cpus = <&cpu0 &cpu1>;
+	};
+
 	gic: interrupt-controller at f1001000 {
 		compatible = "arm,gic-400";
 		#interrupt-cells = <3>;