diff --git a/drivers/renesas/rcar/cpld/ulcb_cpld.c b/drivers/renesas/rcar/cpld/ulcb_cpld.c
index 4830853..5ffb2e1 100644
--- a/drivers/renesas/rcar/cpld/ulcb_cpld.c
+++ b/drivers/renesas/rcar/cpld/ulcb_cpld.c
@@ -68,7 +68,7 @@
 
 	for (i = 0; i < 32; i++) {
 		/* MSB first */
-		gpio_set_value(GPIO_OUTDT6, MOSI, data & (1 << 31));
+		gpio_set_value(GPIO_OUTDT6, MOSI, data & (1U << 31));
 		gpio_set_value(GPIO_OUTDT6, SCLK, 1);
 		data <<= 1;
 		gpio_set_value(GPIO_OUTDT6, SCLK, 0);
diff --git a/drivers/renesas/rcar/pwrc/pwrc.c b/drivers/renesas/rcar/pwrc/pwrc.c
index d97e593..f4c9d3a 100644
--- a/drivers/renesas/rcar/pwrc/pwrc.c
+++ b/drivers/renesas/rcar/pwrc/pwrc.c
@@ -763,10 +763,10 @@
 
 	reg = mmio_read_32(RCAR_PRR);
 
-	if (reg & (1 << (STATE_CA53_CPU + RCAR_CA53CPU_NUM_MAX)))
+	if (reg & (1U << (STATE_CA53_CPU + RCAR_CA53CPU_NUM_MAX)))
 		return RCAR_CLUSTER_CA57;
 
-	if (reg & (1 << (STATE_CA57_CPU + RCAR_CA57CPU_NUM_MAX)))
+	if (reg & (1U << (STATE_CA57_CPU + RCAR_CA57CPU_NUM_MAX)))
 		return RCAR_CLUSTER_CA53;
 
 	return RCAR_CLUSTER_A53A57;
@@ -810,7 +810,7 @@
 
 count_ca57:
 	if (IS_A53A57(c) || IS_CA57(c)) {
-		if (reg & (1 << (STATE_CA57_CPU + RCAR_CA57CPU_NUM_MAX)))
+		if (reg & (1U << (STATE_CA57_CPU + RCAR_CA57CPU_NUM_MAX)))
 			goto done;
 
 		for (i = 0; i < RCAR_CA57CPU_NUM_MAX; i++) {
diff --git a/drivers/renesas/rcar/pwrc/pwrc.h b/drivers/renesas/rcar/pwrc/pwrc.h
index cfb35ff..e67c6ef 100644
--- a/drivers/renesas/rcar/pwrc/pwrc.h
+++ b/drivers/renesas/rcar/pwrc/pwrc.h
@@ -15,7 +15,7 @@
 
 #define PWKUPR_WEN		(1ull << 31)
 
-#define PSYSR_AFF_L2		(1 << 31)
+#define PSYSR_AFF_L2		(1U << 31)
 #define PSYSR_AFF_L1		(1 << 30)
 #define PSYSR_AFF_L0		(1 << 29)
 #define PSYSR_WEN		(1 << 28)