soc: renesas: r8a779a0-sysc: Add r8a779a0 support

Add support for R-Car V3U (R8A779A0) SoC power areas and register
access, because register specification differs from R-Car Gen2/3.

Inspired by patches in the BSP by Tho Vu.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/1599810232-29035-5-git-send-email-yoshihiro.shimoda.uh@renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/soc/renesas/Kconfig

@@ -247,6 +247,7 @@ config ARCH_R8A77970
 config ARCH_R8A779A0
 	bool "ARM64 Platform support for R-Car V3U"
 	select ARCH_RCAR_GEN3
+	select SYSC_R8A779A0
 	help
 	  This enables support for the Renesas R-Car V3U SoC.
 
@@ -338,6 +339,9 @@ config SYSC_R8A77970
 	bool "System Controller support for R-Car V3M" if COMPILE_TEST
 	select SYSC_RCAR
 
+config SYSC_R8A779A0
+	bool "System Controller support for R-Car V3U" if COMPILE_TEST
+
 config SYSC_RMOBILE
 	bool "System Controller support for R-Mobile" if COMPILE_TEST
 

drivers/soc/renesas/Makefile

@@ -24,6 +24,7 @@ obj-$(CONFIG_SYSC_R8A77970)	+= r8a77970-sysc.o
 obj-$(CONFIG_SYSC_R8A77980)	+= r8a77980-sysc.o
 obj-$(CONFIG_SYSC_R8A77990)	+= r8a77990-sysc.o
 obj-$(CONFIG_SYSC_R8A77995)	+= r8a77995-sysc.o
+obj-$(CONFIG_SYSC_R8A779A0)	+= r8a779a0-sysc.o
 ifdef CONFIG_SMP
 obj-$(CONFIG_ARCH_R9A06G032)	+= r9a06g032-smp.o
 endif