diff --git a/include/spdk/endian.h b/include/spdk/endian.h
index 07822d314..1941b0fd5 100644
--- a/include/spdk/endian.h
+++ b/include/spdk/endian.h
@@ -46,9 +46,9 @@ extern "C" {
 #include <stdint.h>
 
 static inline uint16_t
-from_be16(void *ptr)
+from_be16(const void *ptr)
 {
-	uint8_t *tmp = (uint8_t *)ptr;
+	const uint8_t *tmp = (const uint8_t *)ptr;
 	return (((uint16_t)tmp[0] << 8) | tmp[1]);
 }
 
@@ -61,9 +61,9 @@ to_be16(void *out, uint16_t in)
 }
 
 static inline uint32_t
-from_be32(void *ptr)
+from_be32(const void *ptr)
 {
-	uint8_t *tmp = (uint8_t *)ptr;
+	const uint8_t *tmp = (const uint8_t *)ptr;
 	return (((uint32_t)tmp[0] << 24) |
 		((uint32_t)tmp[1] << 16) |
 		((uint32_t)tmp[2] << 8) |
@@ -81,9 +81,9 @@ to_be32(void *out, uint32_t in)
 }
 
 static inline uint64_t
-from_be64(void *ptr)
+from_be64(const void *ptr)
 {
-	uint8_t *tmp = (uint8_t *)ptr;
+	const uint8_t *tmp = (const uint8_t *)ptr;
 	return (((uint64_t)tmp[0] << 56) |
 		((uint64_t)tmp[1] << 48) |
 		((uint64_t)tmp[2] << 40) |
@@ -109,9 +109,9 @@ to_be64(void *out, uint64_t in)
 }
 
 static inline uint16_t
-from_le16(void *ptr)
+from_le16(const void *ptr)
 {
-	uint8_t *tmp = (uint8_t *)ptr;
+	const uint8_t *tmp = (const uint8_t *)ptr;
 	return (((uint16_t)tmp[1] << 8) | tmp[0]);
 }
 
@@ -124,9 +124,9 @@ to_le16(void *out, uint16_t in)
 }
 
 static inline uint32_t
-from_le32(void *ptr)
+from_le32(const void *ptr)
 {
-	uint8_t *tmp = (uint8_t *)ptr;
+	const uint8_t *tmp = (const uint8_t *)ptr;
 	return (((uint32_t)tmp[3] << 24) |
 		((uint32_t)tmp[2] << 16) |
 		((uint32_t)tmp[1] << 8) |
@@ -144,9 +144,9 @@ to_le32(void *out, uint32_t in)
 }
 
 static inline uint64_t
-from_le64(void *ptr)
+from_le64(const void *ptr)
 {
-	uint8_t *tmp = (uint8_t *)ptr;
+	const uint8_t *tmp = (const uint8_t *)ptr;
 	return (((uint64_t)tmp[7] << 56) |
 		((uint64_t)tmp[6] << 48) |
 		((uint64_t)tmp[5] << 40) |