diff --git a/drivers/ram/rockchip/sdram_rk3066.c b/drivers/ram/rockchip/sdram_rk3066.c
index a2425f2..39c0be5 100644
--- a/drivers/ram/rockchip/sdram_rk3066.c
+++ b/drivers/ram/rockchip/sdram_rk3066.c
@@ -801,7 +801,7 @@
 	memcpy(&plat->base, of_plat->rockchip_sdram_params, sizeof(plat->base));
 	/* RK3066 supports dual-channel, set default channel num to 2. */
 	plat->num_channels = 1;
-	ret = regmap_init_mem_plat(dev, of_plat->reg,
+	ret = regmap_init_mem_plat(dev, of_plat->reg, sizeof(of_plat->reg[0]),
 				   ARRAY_SIZE(of_plat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;
diff --git a/drivers/ram/rockchip/sdram_rk3188.c b/drivers/ram/rockchip/sdram_rk3188.c
index 272b1b2..ad9f936 100644
--- a/drivers/ram/rockchip/sdram_rk3188.c
+++ b/drivers/ram/rockchip/sdram_rk3188.c
@@ -867,7 +867,7 @@
 	memcpy(&plat->base, of_plat->rockchip_sdram_params, sizeof(plat->base));
 	/* rk3188 supports dual-channel, set default channel num to 2 */
 	plat->num_channels = 1;
-	ret = regmap_init_mem_plat(dev, of_plat->reg,
+	ret = regmap_init_mem_plat(dev, of_plat->reg, sizeof(of_plat->reg[0]),
 				   ARRAY_SIZE(of_plat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;
diff --git a/drivers/ram/rockchip/sdram_rk322x.c b/drivers/ram/rockchip/sdram_rk322x.c
index 1b204fb..892766a 100644
--- a/drivers/ram/rockchip/sdram_rk322x.c
+++ b/drivers/ram/rockchip/sdram_rk322x.c
@@ -769,7 +769,7 @@
 	memcpy(&plat->base, of_plat->rockchip_sdram_params, sizeof(plat->base));
 
 	plat->num_channels = 1;
-	ret = regmap_init_mem_plat(dev, of_plat->reg,
+	ret = regmap_init_mem_plat(dev, of_plat->reg, sizeof(of_plat->reg[0]),
 				   ARRAY_SIZE(of_plat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;
diff --git a/drivers/ram/rockchip/sdram_rk3288.c b/drivers/ram/rockchip/sdram_rk3288.c
index 83778ad..c99118f 100644
--- a/drivers/ram/rockchip/sdram_rk3288.c
+++ b/drivers/ram/rockchip/sdram_rk3288.c
@@ -1029,7 +1029,7 @@
 	memcpy(&plat->base, of_plat->rockchip_sdram_params, sizeof(plat->base));
 	/* Rk3288 supports dual-channel, set default channel num to 2 */
 	plat->num_channels = 2;
-	ret = regmap_init_mem_plat(dev, of_plat->reg,
+	ret = regmap_init_mem_plat(dev, of_plat->reg, sizeof(of_plat->reg[0]),
 				   ARRAY_SIZE(of_plat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;
diff --git a/drivers/ram/rockchip/sdram_rk3328.c b/drivers/ram/rockchip/sdram_rk3328.c
index 184c93f..b5ca8ca 100644
--- a/drivers/ram/rockchip/sdram_rk3328.c
+++ b/drivers/ram/rockchip/sdram_rk3328.c
@@ -54,7 +54,7 @@
 	struct dtd_rockchip_rk3328_dmc *dtplat = &plat->dtplat;
 	int ret;
 
-	ret = regmap_init_mem_plat(dev, dtplat->reg,
+	ret = regmap_init_mem_plat(dev, dtplat->reg, sizeof(dtplat->reg[0]),
 				   ARRAY_SIZE(dtplat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;
diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index 8993245..2bf8d48 100644
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -3050,7 +3050,7 @@
 	struct dtd_rockchip_rk3399_dmc *dtplat = &plat->dtplat;
 	int ret;
 
-	ret = regmap_init_mem_plat(dev, dtplat->reg,
+	ret = regmap_init_mem_plat(dev, dtplat->reg, sizeof(dtplat->reg[0]),
 				   ARRAY_SIZE(dtplat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;