diff --git a/drivers/rpmsg/mtk_rpmsg.c b/drivers/rpmsg/mtk_rpmsg.c
index 0e03c5336609..1b670ed54cfa 100644
--- a/drivers/rpmsg/mtk_rpmsg.c
+++ b/drivers/rpmsg/mtk_rpmsg.c
@@ -135,7 +135,7 @@ static void mtk_rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
 	kref_put(&ept->refcount, __mtk_ept_release);
 }
 
-static int mtk_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+static int mtk_rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct mtk_rpmsg_rproc_subdev *mtk_subdev =
 		to_mtk_rpmsg_endpoint(ept)->mtk_subdev;
@@ -144,7 +144,7 @@ static int mtk_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
 					  len, 0);
 }
 
-static int mtk_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+static int mtk_rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct mtk_rpmsg_rproc_subdev *mtk_subdev =
 		to_mtk_rpmsg_endpoint(ept)->mtk_subdev;
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index 9ef17c2e45b0..401a4ece0c97 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -1474,7 +1474,7 @@ static int qcom_glink_request_intent(struct qcom_glink *glink,
 }
 
 static int __qcom_glink_send(struct glink_channel *channel,
-			     void *data, int len, bool wait)
+			     const void *data, int len, bool wait)
 {
 	struct qcom_glink *glink = channel->glink;
 	struct glink_core_rx_intent *intent = NULL;
@@ -1553,28 +1553,31 @@ static int __qcom_glink_send(struct glink_channel *channel,
 	return 0;
 }
 
-static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len)
+static int qcom_glink_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct glink_channel *channel = to_glink_channel(ept);
 
 	return __qcom_glink_send(channel, data, len, true);
 }
 
-static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+static int qcom_glink_trysend(struct rpmsg_endpoint *ept, const void *data,
+			      int len)
 {
 	struct glink_channel *channel = to_glink_channel(ept);
 
 	return __qcom_glink_send(channel, data, len, false);
 }
 
-static int qcom_glink_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+static int qcom_glink_sendto(struct rpmsg_endpoint *ept, const void *data,
+			     int len, u32 dst)
 {
 	struct glink_channel *channel = to_glink_channel(ept);
 
 	return __qcom_glink_send(channel, data, len, true);
 }
 
-static int qcom_glink_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+static int qcom_glink_trysendto(struct rpmsg_endpoint *ept, const void *data,
+				int len, u32 dst)
 {
 	struct glink_channel *channel = to_glink_channel(ept);
 
diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
index e1eb450f4fea..3ac863f400ec 100644
--- a/drivers/rpmsg/qcom_smd.c
+++ b/drivers/rpmsg/qcom_smd.c
@@ -960,28 +960,30 @@ static void qcom_smd_destroy_ept(struct rpmsg_endpoint *ept)
 	kref_put(&ept->refcount, __ept_release);
 }
 
-static int qcom_smd_send(struct rpmsg_endpoint *ept, void *data, int len)
+static int qcom_smd_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);
 
 	return __qcom_smd_send(qsept->qsch, data, len, true);
 }
 
-static int qcom_smd_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+static int qcom_smd_trysend(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);
 
 	return __qcom_smd_send(qsept->qsch, data, len, false);
 }
 
-static int qcom_smd_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+static int qcom_smd_sendto(struct rpmsg_endpoint *ept, const void *data, int len,
+			   u32 dst)
 {
 	struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);
 
 	return __qcom_smd_send(qsept->qsch, data, len, true);
 }
 
-static int qcom_smd_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+static int qcom_smd_trysendto(struct rpmsg_endpoint *ept, const void *data,
+			      int len, u32 dst)
 {
 	struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);
 
diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
index 948541656950..e7f7831d37f8 100644
--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -153,7 +153,7 @@ EXPORT_SYMBOL(rpmsg_destroy_ept);
  *
  * Return: 0 on success and an appropriate error value on failure.
  */
-int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+int rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	if (WARN_ON(!ept))
 		return -EINVAL;
@@ -182,7 +182,7 @@ EXPORT_SYMBOL(rpmsg_send);
  *
  * Return: 0 on success and an appropriate error value on failure.
  */
-int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+int rpmsg_sendto(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst)
 {
 	if (WARN_ON(!ept))
 		return -EINVAL;
@@ -210,7 +210,7 @@ EXPORT_SYMBOL(rpmsg_sendto);
  *
  * Return: 0 on success and an appropriate error value on failure.
  */
-int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+int rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	if (WARN_ON(!ept))
 		return -EINVAL;
@@ -238,7 +238,7 @@ EXPORT_SYMBOL(rpmsg_trysend);
  *
  * Return: 0 on success and an appropriate error value on failure.
  */
-int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
+int rpmsg_trysendto(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst)
 {
 	if (WARN_ON(!ept))
 		return -EINVAL;
diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h
index 397e4926bd02..a8b7065fd165 100644
--- a/drivers/rpmsg/rpmsg_internal.h
+++ b/drivers/rpmsg/rpmsg_internal.h
@@ -63,11 +63,11 @@ struct rpmsg_device_ops {
 struct rpmsg_endpoint_ops {
 	void (*destroy_ept)(struct rpmsg_endpoint *ept);
 
-	int (*send)(struct rpmsg_endpoint *ept, void *data, int len);
-	int (*sendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+	int (*send)(struct rpmsg_endpoint *ept, const void *data, int len);
+	int (*sendto)(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst);
 
-	int (*trysend)(struct rpmsg_endpoint *ept, void *data, int len);
-	int (*trysendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+	int (*trysend)(struct rpmsg_endpoint *ept, const void *data, int len);
+	int (*trysendto)(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst);
 	__poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
 			     poll_table *wait);
 	int (*set_flow_control)(struct rpmsg_endpoint *ept, bool pause, u32 dst);
diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 8d9e2b4dc7c1..5ae15111fb4f 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -136,11 +136,12 @@ struct virtio_rpmsg_channel {
 #define RPMSG_RESERVED_ADDRESSES	(1024)
 
 static void virtio_rpmsg_destroy_ept(struct rpmsg_endpoint *ept);
-static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
-static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
-			       u32 dst);
-static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
-static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
+static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len);
+static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, const void *data,
+			       int len, u32 dst);
+static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data,
+				int len);
+static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, const void *data,
 				  int len, u32 dst);
 static __poll_t virtio_rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
 				  poll_table *wait);
@@ -490,7 +491,7 @@ static void *get_a_tx_buf(struct virtproc_info *vrp)
  */
 static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev,
 				     u32 src, u32 dst,
-				     void *data, int len, bool wait)
+				     const void *data, int len, bool wait)
 {
 	struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
 	struct virtproc_info *vrp = vch->vrp;
@@ -580,7 +581,7 @@ static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev,
 	return err;
 }
 
-static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	struct rpmsg_device *rpdev = ept->rpdev;
 	u32 src = ept->addr, dst = rpdev->dst;
@@ -588,8 +589,8 @@ static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
 	return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
 }
 
-static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
-			       u32 dst)
+static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, const void *data,
+			       int len, u32 dst)
 {
 	struct rpmsg_device *rpdev = ept->rpdev;
 	u32 src = ept->addr;
@@ -597,7 +598,8 @@ static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
 	return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
 }
 
-static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data,
+				int len)
 {
 	struct rpmsg_device *rpdev = ept->rpdev;
 	u32 src = ept->addr, dst = rpdev->dst;
@@ -605,7 +607,7 @@ static int virtio_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
 	return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
 }
 
-static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
+static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, const void *data,
 				  int len, u32 dst)
 {
 	struct rpmsg_device *rpdev = ept->rpdev;
diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
index fb7ab9165645..83266ce14642 100644
--- a/include/linux/rpmsg.h
+++ b/include/linux/rpmsg.h
@@ -182,11 +182,11 @@ struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *,
 					rpmsg_rx_cb_t cb, void *priv,
 					struct rpmsg_channel_info chinfo);
 
-int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
-int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+int rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len);
+int rpmsg_sendto(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst);
 
-int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
-int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+int rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data, int len);
+int rpmsg_trysendto(struct rpmsg_endpoint *ept, const void *data, int len, u32 dst);
 
 __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
 			poll_table *wait);
@@ -249,7 +249,7 @@ static inline struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev
 	return NULL;
 }
 
-static inline int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+static inline int rpmsg_send(struct rpmsg_endpoint *ept, const void *data, int len)
 {
 	/* This shouldn't be possible */
 	WARN_ON(1);
@@ -257,7 +257,7 @@ static inline int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
 	return -ENXIO;
 }
 
-static inline int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
+static inline int rpmsg_sendto(struct rpmsg_endpoint *ept, const void *data, int len,
 			       u32 dst)
 {
 	/* This shouldn't be possible */
@@ -267,7 +267,8 @@ static inline int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
 
 }
 
-static inline int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+static inline int rpmsg_trysend(struct rpmsg_endpoint *ept, const void *data,
+				int len)
 {
 	/* This shouldn't be possible */
 	WARN_ON(1);
@@ -275,7 +276,7 @@ static inline int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
 	return -ENXIO;
 }
 
-static inline int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
+static inline int rpmsg_trysendto(struct rpmsg_endpoint *ept, const void *data,
 				  int len, u32 dst)
 {
 	/* This shouldn't be possible */