diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig
index 937ab43fae6a..a792a3e915fe 100644
--- a/drivers/soc/renesas/Kconfig
+++ b/drivers/soc/renesas/Kconfig
@@ -334,6 +334,7 @@ config ARCH_R9A07G054
 config ARCH_R9A08G045
 	bool "ARM64 Platform support for RZ/G3S"
 	select ARCH_RZG2L
+	select SYSC_R9A08G045
 	help
 	  This enables support for the Renesas RZ/G3S SoC variants.
 
@@ -386,4 +387,8 @@ config RST_RCAR
 config SYSC_RZ
 	bool "System controller for RZ SoCs" if COMPILE_TEST
 
+config SYSC_R9A08G045
+	bool "Renesas RZ/G3S System controller support" if COMPILE_TEST
+	select SYSC_RZ
+
 endif # SOC_RENESAS
diff --git a/drivers/soc/renesas/Makefile b/drivers/soc/renesas/Makefile
index 3d5f847ed889..8cd139b3dd0a 100644
--- a/drivers/soc/renesas/Makefile
+++ b/drivers/soc/renesas/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_SOC_RENESAS)	+= renesas-soc.o
 ifdef CONFIG_SMP
 obj-$(CONFIG_ARCH_R9A06G032)	+= r9a06g032-smp.o
 endif
+obj-$(CONFIG_SYSC_R9A08G045)	+= r9a08g045-sysc.o
 
 # Family
 obj-$(CONFIG_PWC_RZV2M)		+= pwc-rzv2m.o
diff --git a/drivers/soc/renesas/r9a08g045-sysc.c b/drivers/soc/renesas/r9a08g045-sysc.c
new file mode 100644
index 000000000000..babcf1cbcb49
--- /dev/null
+++ b/drivers/soc/renesas/r9a08g045-sysc.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * RZ/G3S System controller driver
+ *
+ * Copyright (C) 2024 Renesas Electronics Corp.
+ */
+
+#include <linux/bits.h>
+#include <linux/init.h>
+
+#include "rz-sysc.h"
+
+#define SYS_LSI_DEVID		0xa04
+#define SYS_LSI_DEVID_REV	GENMASK(31, 28)
+#define SYS_LSI_DEVID_SPECIFIC	GENMASK(27, 0)
+#define SYS_MAX_REG		0xe20
+
+static const struct rz_sysc_soc_id_init_data rzg3s_sysc_soc_id_init_data __initconst = {
+	.family = "RZ/G3S",
+	.id = 0x85e0447,
+	.offset = SYS_LSI_DEVID,
+	.revision_mask = SYS_LSI_DEVID_REV,
+	.specific_id_mask = SYS_LSI_DEVID_SPECIFIC
+};
+
+const struct rz_sysc_init_data rzg3s_sysc_init_data __initconst = {
+	.soc_id_init_data = &rzg3s_sysc_soc_id_init_data,
+};
diff --git a/drivers/soc/renesas/renesas-soc.c b/drivers/soc/renesas/renesas-soc.c
index 172d59e6fbcf..425d9037dcd0 100644
--- a/drivers/soc/renesas/renesas-soc.c
+++ b/drivers/soc/renesas/renesas-soc.c
@@ -71,10 +71,6 @@ static const struct renesas_family fam_rzg2ul __initconst __maybe_unused = {
 	.name	= "RZ/G2UL",
 };
 
-static const struct renesas_family fam_rzg3s __initconst __maybe_unused = {
-	.name	= "RZ/G3S",
-};
-
 static const struct renesas_family fam_rzv2h __initconst __maybe_unused = {
 	.name	= "RZ/V2H",
 };
@@ -176,11 +172,6 @@ static const struct renesas_soc soc_rz_g2ul __initconst __maybe_unused = {
 	.id     = 0x8450447,
 };
 
-static const struct renesas_soc soc_rz_g3s __initconst __maybe_unused = {
-	.family = &fam_rzg3s,
-	.id	= 0x85e0447,
-};
-
 static const struct renesas_soc soc_rz_v2h __initconst __maybe_unused = {
 	.family = &fam_rzv2h,
 	.id     = 0x847a447,
@@ -410,9 +401,6 @@ static const struct of_device_id renesas_socs[] __initconst __maybe_unused = {
 #ifdef CONFIG_ARCH_R9A07G054
 	{ .compatible = "renesas,r9a07g054",	.data = &soc_rz_v2l },
 #endif
-#ifdef CONFIG_ARCH_R9A08G045
-	{ .compatible = "renesas,r9a08g045",	.data = &soc_rz_g3s },
-#endif
 #ifdef CONFIG_ARCH_R9A09G011
 	{ .compatible = "renesas,r9a09g011",	.data = &soc_rz_v2m },
 #endif
diff --git a/drivers/soc/renesas/rz-sysc.c b/drivers/soc/renesas/rz-sysc.c
index 64fc56229440..c0d4aca4c2b6 100644
--- a/drivers/soc/renesas/rz-sysc.c
+++ b/drivers/soc/renesas/rz-sysc.c
@@ -74,6 +74,9 @@ static int rz_sysc_soc_init(struct rz_sysc *sysc, const struct of_device_id *mat
 }
 
 static const struct of_device_id rz_sysc_match[] = {
+#ifdef CONFIG_SYSC_R9A08G045
+	{ .compatible = "renesas,r9a08g045-sysc", .data = &rzg3s_sysc_init_data },
+#endif
 	{ }
 };
 MODULE_DEVICE_TABLE(of, rz_sysc_match);
diff --git a/drivers/soc/renesas/rz-sysc.h b/drivers/soc/renesas/rz-sysc.h
index d74047686988..1ee25c78ba8b 100644
--- a/drivers/soc/renesas/rz-sysc.h
+++ b/drivers/soc/renesas/rz-sysc.h
@@ -34,4 +34,6 @@ struct rz_sysc_init_data {
 	const struct rz_sysc_soc_id_init_data *soc_id_init_data;
 };
 
+extern const struct rz_sysc_init_data rzg3s_sysc_init_data;
+
 #endif /* __SOC_RENESAS_RZ_SYSC_H__ */
