diff --git a/src/soc/intel/baytrail/iosf.c b/src/soc/intel/baytrail/iosf.c
index 497dde4068..5a8331057e 100644
--- a/src/soc/intel/baytrail/iosf.c
+++ b/src/soc/intel/baytrail/iosf.c
@@ -85,7 +85,7 @@ uint32_t iosf_usbphy_read(int reg)
 
 void iosf_usbphy_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(USBPHY), reg, val);
+	iosf_write_port(IOSF_WRITE(USBPHY), reg, val);
 }
 
 uint32_t iosf_ushphy_read(int reg)
@@ -95,7 +95,7 @@ uint32_t iosf_ushphy_read(int reg)
 
 void iosf_ushphy_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(USHPHY), reg, val);
+	iosf_write_port(IOSF_WRITE(USHPHY), reg, val);
 }
 
 uint32_t iosf_lpss_read(int reg)
@@ -105,7 +105,7 @@ uint32_t iosf_lpss_read(int reg)
 
 void iosf_lpss_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(LPSS), reg, val);
+	iosf_write_port(IOSF_WRITE(LPSS), reg, val);
 }
 
 uint32_t iosf_ccu_read(int reg)
@@ -115,7 +115,7 @@ uint32_t iosf_ccu_read(int reg)
 
 void iosf_ccu_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(CCU), reg, val);
+	iosf_write_port(IOSF_WRITE(CCU), reg, val);
 }
 
 uint32_t iosf_score_read(int reg)
@@ -125,7 +125,7 @@ uint32_t iosf_score_read(int reg)
 
 void iosf_score_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(SCORE), reg, val);
+	iosf_write_port(IOSF_WRITE(SCORE), reg, val);
 }
 
 uint32_t iosf_scc_read(int reg)
@@ -135,7 +135,7 @@ uint32_t iosf_scc_read(int reg)
 
 void iosf_scc_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(SCC), reg, val);
+	iosf_write_port(IOSF_WRITE(SCC), reg, val);
 }
 
 uint32_t iosf_aunit_read(int reg)
@@ -145,7 +145,7 @@ uint32_t iosf_aunit_read(int reg)
 
 void iosf_aunit_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(AUNIT), reg, val);
+	iosf_write_port(IOSF_WRITE(AUNIT), reg, val);
 }
 
 uint32_t iosf_cpu_bus_read(int reg)
@@ -155,7 +155,7 @@ uint32_t iosf_cpu_bus_read(int reg)
 
 void iosf_cpu_bus_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(CPU_BUS), reg, val);
+	iosf_write_port(IOSF_WRITE(CPU_BUS), reg, val);
 }
 
 uint32_t iosf_sec_read(int reg)
@@ -165,7 +165,7 @@ uint32_t iosf_sec_read(int reg)
 
 void iosf_sec_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(SEC), reg, val);
+	iosf_write_port(IOSF_WRITE(SEC), reg, val);
 }
 
 uint32_t iosf_port45_read(int reg)
@@ -175,7 +175,7 @@ uint32_t iosf_port45_read(int reg)
 
 void iosf_port45_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(0x45), reg, val);
+	iosf_write_port(IOSF_WRITE(0x45), reg, val);
 }
 
 uint32_t iosf_port46_read(int reg)
@@ -185,7 +185,7 @@ uint32_t iosf_port46_read(int reg)
 
 void iosf_port46_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(0x46), reg, val);
+	iosf_write_port(IOSF_WRITE(0x46), reg, val);
 }
 
 uint32_t iosf_port47_read(int reg)
@@ -195,7 +195,7 @@ uint32_t iosf_port47_read(int reg)
 
 void iosf_port47_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(0x47), reg, val);
+	iosf_write_port(IOSF_WRITE(0x47), reg, val);
 }
 
 uint32_t iosf_port55_read(int reg)
@@ -205,7 +205,7 @@ uint32_t iosf_port55_read(int reg)
 
 void iosf_port55_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(0x55), reg, val);
+	iosf_write_port(IOSF_WRITE(0x55), reg, val);
 }
 
 uint32_t iosf_port58_read(int reg)
@@ -215,7 +215,7 @@ uint32_t iosf_port58_read(int reg)
 
 void iosf_port58_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(0x58), reg, val);
+	iosf_write_port(IOSF_WRITE(0x58), reg, val);
 }
 
 uint32_t iosf_port59_read(int reg)
@@ -225,7 +225,7 @@ uint32_t iosf_port59_read(int reg)
 
 void iosf_port59_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(0x59), reg, val);
+	iosf_write_port(IOSF_WRITE(0x59), reg, val);
 }
 
 uint32_t iosf_port5a_read(int reg)
@@ -235,7 +235,7 @@ uint32_t iosf_port5a_read(int reg)
 
 void iosf_port5a_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(0x5a), reg, val);
+	iosf_write_port(IOSF_WRITE(0x5a), reg, val);
 }
 
 uint32_t iosf_porta2_read(int reg)
@@ -245,7 +245,7 @@ uint32_t iosf_porta2_read(int reg)
 
 void iosf_porta2_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(0xa2), reg, val);
+	iosf_write_port(IOSF_WRITE(0xa2), reg, val);
 }
 
 uint32_t iosf_ssus_read(int reg)
@@ -255,5 +255,5 @@ uint32_t iosf_ssus_read(int reg)
 
 void iosf_ssus_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(SSUS), reg, val);
+	iosf_write_port(IOSF_WRITE(SSUS), reg, val);
 }
diff --git a/src/soc/intel/braswell/iosf.c b/src/soc/intel/braswell/iosf.c
index a0d4b4fbca..11c44d0387 100644
--- a/src/soc/intel/braswell/iosf.c
+++ b/src/soc/intel/braswell/iosf.c
@@ -94,7 +94,7 @@ uint32_t iosf_scc_read(int reg)
 
 void iosf_scc_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(SCC), reg, val);
+	iosf_write_port(IOSF_WRITE(SCC), reg, val);
 }
 
 uint32_t iosf_usbphy_read(int reg)
@@ -104,7 +104,7 @@ uint32_t iosf_usbphy_read(int reg)
 
 void iosf_usbphy_write(int reg, uint32_t val)
 {
-	return iosf_write_port(IOSF_WRITE(USBPHY), reg, val);
+	iosf_write_port(IOSF_WRITE(USBPHY), reg, val);
 }
 
 #if ENV_RAMSTAGE