diff --git a/drivers/soc/renesas/r9a09g047-sys.c b/drivers/soc/renesas/r9a09g047-sys.c
index e413b0eff9bf..ea3ca10fcc33 100644
--- a/drivers/soc/renesas/r9a09g047-sys.c
+++ b/drivers/soc/renesas/r9a09g047-sys.c
@@ -139,7 +139,7 @@ static bool rzg3e_regmap_writeable_reg(struct device *dev, unsigned int reg)
 	}
 }
 
-const struct rz_sysc_init_data rzg3e_sys_init_data = {
+const struct rz_sysc_init_data rzg3e_sys_init_data __initconst = {
 	.soc_id_init_data = &rzg3e_sys_soc_id_init_data,
 	.readable_reg = rzg3e_regmap_readable_reg,
 	.writeable_reg = rzg3e_regmap_writeable_reg,
diff --git a/drivers/soc/renesas/r9a09g056-sys.c b/drivers/soc/renesas/r9a09g056-sys.c
index 42f5eff291fd..2a8ebc209961 100644
--- a/drivers/soc/renesas/r9a09g056-sys.c
+++ b/drivers/soc/renesas/r9a09g056-sys.c
@@ -136,7 +136,7 @@ static bool rzv2n_regmap_writeable_reg(struct device *dev, unsigned int reg)
 	}
 }
 
-const struct rz_sysc_init_data rzv2n_sys_init_data = {
+const struct rz_sysc_init_data rzv2n_sys_init_data __initconst = {
 	.soc_id_init_data = &rzv2n_sys_soc_id_init_data,
 	.readable_reg = rzv2n_regmap_readable_reg,
 	.writeable_reg = rzv2n_regmap_writeable_reg,
diff --git a/drivers/soc/renesas/r9a09g057-sys.c b/drivers/soc/renesas/r9a09g057-sys.c
index 827c718ac7c5..f3e054206acb 100644
--- a/drivers/soc/renesas/r9a09g057-sys.c
+++ b/drivers/soc/renesas/r9a09g057-sys.c
@@ -161,7 +161,7 @@ static bool rzv2h_regmap_writeable_reg(struct device *dev, unsigned int reg)
 	}
 }
 
-const struct rz_sysc_init_data rzv2h_sys_init_data = {
+const struct rz_sysc_init_data rzv2h_sys_init_data __initconst = {
 	.soc_id_init_data = &rzv2h_sys_soc_id_init_data,
 	.readable_reg = rzv2h_regmap_readable_reg,
 	.writeable_reg = rzv2h_regmap_writeable_reg,