[PATCH 3/5] nvmem: constify the write path

[Marco Felsch]

Constify the nvmem_*_write() functions as the write functions shouldn't
alter the buffer content.

Signed-off-by: Marco Felsch <m.felsch at pengutronix.de>
---
 drivers/nvmem/core.c           | 10 +++++-----
 include/linux/nvmem-consumer.h |  8 ++++----
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index b4a29e4b67f3..7d795d5873dc 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -794,8 +794,8 @@ void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
 }
 EXPORT_SYMBOL_GPL(nvmem_cell_read);
 
-static inline void *nvmem_cell_prepare_write_buffer(struct nvmem_cell_entry *cell,
-						    u8 *_buf, int len)
+static inline const void *nvmem_cell_prepare_write_buffer(struct nvmem_cell_entry *cell,
+							  const u8 *_buf, int len)
 {
 	struct nvmem_device *nvmem = cell->nvmem;
 	int i, rc, nbits, bit_offset = cell->bit_offset;
@@ -846,7 +846,7 @@ static inline void *nvmem_cell_prepare_write_buffer(struct nvmem_cell_entry *cel
 	return buf;
 }
 
-static int __nvmem_cell_entry_write(struct nvmem_cell_entry *cell, void *buf, size_t len)
+static int __nvmem_cell_entry_write(struct nvmem_cell_entry *cell, const void *buf, size_t len)
 {
 	struct nvmem_device *nvmem = cell->nvmem;
 	int rc;
@@ -890,7 +890,7 @@ static int __nvmem_cell_entry_write(struct nvmem_cell_entry *cell, void *buf, si
  *
  * Return: length of bytes written or negative on failure.
  */
-int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len)
+int nvmem_cell_write(struct nvmem_cell *cell, const void *buf, size_t len)
 {
 	return __nvmem_cell_entry_write(cell->entry, buf, len);
 }
@@ -938,7 +938,7 @@ EXPORT_SYMBOL_GPL(nvmem_device_cell_read);
  * Return: length of bytes written or negative error code on failure.
  * */
 int nvmem_device_cell_write(struct nvmem_device *nvmem,
-			    struct nvmem_cell_info *info, void *buf)
+			    struct nvmem_cell_info *info, const void *buf)
 {
 	struct nvmem_cell_entry cell;
 	int rc;
diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
index 54643b792aed..478f469c3560 100644
--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -30,7 +30,7 @@ void *nvmem_cell_get_and_read(struct device_node *np, const char *cell_name,
 int nvmem_cell_read_variable_le_u32(struct device *dev, const char *cell_id,
 				    u32 *val);
 
-int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len);
+int nvmem_cell_write(struct nvmem_cell *cell, const void *buf, size_t len);
 
 /* direct nvmem device read/write interface */
 struct nvmem_device *nvmem_device_get(struct device *dev, const char *name);
@@ -42,7 +42,7 @@ int nvmem_device_write(struct nvmem_device *nvmem, unsigned int offset,
 ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem,
 			       struct nvmem_cell_info *info, void *buf);
 int nvmem_device_cell_write(struct nvmem_device *nvmem,
-			    struct nvmem_cell_info *info, void *buf);
+			    struct nvmem_cell_info *info, const void *buf);
 
 void nvmem_devices_print(void);
 
@@ -78,7 +78,7 @@ static inline int nvmem_cell_read_variable_le_u32(struct device *dev,
 }
 
 static inline int nvmem_cell_write(struct nvmem_cell *cell,
-				    void *buf, size_t len)
+				   const void *buf, size_t len)
 {
 	return -EOPNOTSUPP;
 }
@@ -102,7 +102,7 @@ static inline ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem,
 
 static inline int nvmem_device_cell_write(struct nvmem_device *nvmem,
 					  struct nvmem_cell_info *info,
-					  void *buf)
+					  const void *buf)
 {
 	return -EOPNOTSUPP;
 }
-- 
2.39.2