soc: renesas: Identify R-Car S4-8

Add support for identifying the R-Car S4-8 (R8A779F0) SoC.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20211201073308.1003945-8-yoshihiro.shimoda.uh@renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/soc/renesas/Kconfig

@@ -235,6 +235,13 @@ config ARCH_R8A77961
 	  This enables support for the Renesas R-Car M3-W+ SoC.
 	  This includes different gradings like R-Car M3e and M3e-2G.
 
+config ARCH_R8A779F0
+	bool "ARM64 Platform support for R-Car S4-8"
+	select ARCH_RCAR_GEN3
+	select SYSC_R8A779F0
+	help
+	  This enables support for the Renesas R-Car S4-8 SoC.
+
 config ARCH_R8A77980
 	bool "ARM64 Platform support for R-Car V3H"
 	select ARCH_RCAR_GEN3

drivers/soc/renesas/renesas-soc.c

@@ -33,6 +33,10 @@ static const struct renesas_family fam_rcar_gen3 __initconst __maybe_unused = {
 	.reg	= 0xfff00044,		/* PRR (Product Register) */
 };
 
+static const struct renesas_family fam_rcar_gen4 __initconst __maybe_unused = {
+	.name	= "R-Car Gen4",
+};
+
 static const struct renesas_family fam_rmobile __initconst __maybe_unused = {
 	.name	= "R-Mobile",
 	.reg	= 0xe600101c,		/* CCCR (Common Chip Code Register) */
@@ -214,6 +218,11 @@ static const struct renesas_soc soc_rcar_v3u __initconst __maybe_unused = {
 	.id	= 0x59,
 };
 
+static const struct renesas_soc soc_rcar_s4 __initconst __maybe_unused = {
+	.family	= &fam_rcar_gen4,
+	.id	= 0x5a,
+};
+
 static const struct renesas_soc soc_shmobile_ag5 __initconst __maybe_unused = {
 	.family	= &fam_shmobile,
 	.id	= 0x37,
@@ -319,6 +328,9 @@ static const struct of_device_id renesas_socs[] __initconst = {
 #ifdef CONFIG_ARCH_R8A779A0
 	{ .compatible = "renesas,r8a779a0",	.data = &soc_rcar_v3u },
 #endif
+#ifdef CONFIG_ARCH_R8A779F0
+	{ .compatible = "renesas,r8a779f0",	.data = &soc_rcar_s4 },
+#endif
 #if defined(CONFIG_ARCH_R9A07G044)
 	{ .compatible = "renesas,r9a07g044",	.data = &soc_rz_g2l },
 #endif