ARM: shmobile: r8a7743: add power domain index macros

Add macros usable by the device tree sources to reference R8A7743 SYSC power
domains by index.

Based on the original (and large) patch by Dmitry Shifrin
<dmitry.shifrin@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>

include/dt-bindings/power/r8a7743-sysc.h

+/*
+ * Copyright (C) 2016 Cogent Embedded Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __DT_BINDINGS_POWER_R8A7743_SYSC_H__
+#define __DT_BINDINGS_POWER_R8A7743_SYSC_H__
+
+/*
+ * These power domain indices match the numbers of the interrupt bits
+ * representing the power areas in the various Interrupt Registers
+ * (e.g. SYSCISR, Interrupt Status Register)
+ */
+
+#define R8A7743_PD_CA15_CPU0		 0
+#define R8A7743_PD_CA15_CPU1		 1
+#define R8A7743_PD_CA15_SCU		12
+#define R8A7743_PD_SGX			20
+
+/* Always-on power area */
+#define R8A7743_PD_ALWAYS_ON		32
+
+#endif /* __DT_BINDINGS_POWER_R8A7743_SYSC_H__ */