soc: renesas: Add ARCH_R8A77960 for existing R-Car M3-W

Add CONFIG_ARCH_R8A77960 as a new config symbol for R-Car M3-W
(R8A77960), to replace CONFIG_ARCH_R8A7796, and avoid confusion with
R-Car M3-W+ (R8A77961), which will use CONFIG_ARCH_R8A77961.

Note that for now, CONFIG_ARCH_R8A7796 is retained, and just selects
CONFIG_ARCH_R8A77960.  This relaxes dependencies of other subsystems on
the SoC configuration symbol, and provides a smooth transition path for
config files through "make oldconfig".
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20191023123342.13100-3-geert+renesas@glider.be

drivers/soc/renesas/Kconfig

@@ -199,10 +199,14 @@ config ARCH_R8A7795
 	help
 	  This enables support for the Renesas R-Car H3 SoC.
 
-config ARCH_R8A7796
-	bool "Renesas R-Car M3-W SoC Platform"
+config ARCH_R8A77960
+	bool
 	select ARCH_RCAR_GEN3
 	select SYSC_R8A77960
+
+config ARCH_R8A7796
+	bool "Renesas R-Car M3-W SoC Platform"
+	select ARCH_R8A77960
 	help
 	  This enables support for the Renesas R-Car M3-W SoC.
 

drivers/soc/renesas/renesas-soc.c

@@ -262,7 +262,7 @@ static const struct of_device_id renesas_socs[] __initconst = {
 #ifdef CONFIG_ARCH_R8A7795
 	{ .compatible = "renesas,r8a7795",	.data = &soc_rcar_h3 },
 #endif
-#ifdef CONFIG_ARCH_R8A7796
+#ifdef CONFIG_ARCH_R8A77960
 	{ .compatible = "renesas,r8a7796",	.data = &soc_rcar_m3_w },
 #endif
 #ifdef CONFIG_ARCH_R8A77965