soundwire: stream: constify sdw_port_config when adding devices

sdw_stream_add_master() and sdw_stream_add_slave() do not modify
contents of passed sdw_port_config, so it can be made const for code
safety and as documentation of expected usage.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20231120174720.239610-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/stream.c

@@ -897,7 +897,7 @@ static struct sdw_port_runtime *sdw_port_alloc(struct list_head *port_list)
 }
 
 static int sdw_port_config(struct sdw_port_runtime *p_rt,
-			   struct sdw_port_config *port_config,
+			   const struct sdw_port_config *port_config,
 			   int port_index)
 {
 	p_rt->ch_mask = port_config[port_index].ch_mask;
@@ -970,7 +970,7 @@ static int sdw_slave_port_is_valid_range(struct device *dev, int num)
 
 static int sdw_slave_port_config(struct sdw_slave *slave,
 				 struct sdw_slave_runtime *s_rt,
-				 struct sdw_port_config *port_config)
+				 const struct sdw_port_config *port_config)
 {
 	struct sdw_port_runtime *p_rt;
 	int ret;
@@ -1026,7 +1026,7 @@ static int sdw_master_port_alloc(struct sdw_master_runtime *m_rt,
 }
 
 static int sdw_master_port_config(struct sdw_master_runtime *m_rt,
-				  struct sdw_port_config *port_config)
+				  const struct sdw_port_config *port_config)
 {
 	struct sdw_port_runtime *p_rt;
 	int ret;
@@ -1861,7 +1861,7 @@ EXPORT_SYMBOL(sdw_release_stream);
  */
 int sdw_stream_add_master(struct sdw_bus *bus,
 			  struct sdw_stream_config *stream_config,
-			  struct sdw_port_config *port_config,
+			  const struct sdw_port_config *port_config,
 			  unsigned int num_ports,
 			  struct sdw_stream_runtime *stream)
 {
@@ -1981,7 +1981,7 @@ EXPORT_SYMBOL(sdw_stream_remove_master);
  */
 int sdw_stream_add_slave(struct sdw_slave *slave,
 			 struct sdw_stream_config *stream_config,
-			 struct sdw_port_config *port_config,
+			 const struct sdw_port_config *port_config,
 			 unsigned int num_ports,
 			 struct sdw_stream_runtime *stream)
 {

include/linux/soundwire/sdw.h

@@ -1040,7 +1040,7 @@ int sdw_compute_params(struct sdw_bus *bus);
 
 int sdw_stream_add_master(struct sdw_bus *bus,
 		struct sdw_stream_config *stream_config,
-		struct sdw_port_config *port_config,
+		const struct sdw_port_config *port_config,
 		unsigned int num_ports,
 		struct sdw_stream_runtime *stream);
 int sdw_stream_remove_master(struct sdw_bus *bus,
@@ -1062,7 +1062,7 @@ void sdw_extract_slave_id(struct sdw_bus *bus, u64 addr, struct sdw_slave_id *id
 
 int sdw_stream_add_slave(struct sdw_slave *slave,
 			 struct sdw_stream_config *stream_config,
-			 struct sdw_port_config *port_config,
+			 const struct sdw_port_config *port_config,
 			 unsigned int num_ports,
 			 struct sdw_stream_runtime *stream);
 int sdw_stream_remove_slave(struct sdw_slave *slave,
@@ -1084,7 +1084,7 @@ int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val);
 
 static inline int sdw_stream_add_slave(struct sdw_slave *slave,
 				       struct sdw_stream_config *stream_config,
-				       struct sdw_port_config *port_config,
+				       const struct sdw_port_config *port_config,
 				       unsigned int num_ports,
 				       struct sdw_stream_runtime *stream)
 {