ASoC: cs4271: flat regcache, trivial simplifications

- Switch to REGCACHE_FLAT, the whole overhead of RBTREE is not worth it
  with non sparse register set in the address range 1..7.
- Move register width to central location
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Link: https://lore.kernel.org/r/20230410223902.2321834-3-alexander.sverdlin@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs4271-i2c.c

@@ -17,7 +17,6 @@ static int cs4271_i2c_probe(struct i2c_client *client)
 
 	config = cs4271_regmap_config;
 	config.reg_bits = 8;
-	config.val_bits = 8;
 
 	return cs4271_probe(&client->dev,
 			    devm_regmap_init_i2c(client, &config));

sound/soc/codecs/cs4271-spi.c

@@ -17,7 +17,6 @@ static int cs4271_spi_probe(struct spi_device *spi)
 
 	config = cs4271_regmap_config;
 	config.reg_bits = 16;
-	config.val_bits = 8;
 	config.read_flag_mask = 0x21;
 	config.write_flag_mask = 0x20;
 

sound/soc/codecs/cs4271.c

@@ -689,8 +689,8 @@ const struct regmap_config cs4271_regmap_config = {
 
 	.reg_defaults = cs4271_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(cs4271_reg_defaults),
-	.cache_type = REGCACHE_RBTREE,
-
+	.cache_type = REGCACHE_FLAT,
+	.val_bits = 8,
 	.volatile_reg = cs4271_volatile_reg,
 };
 EXPORT_SYMBOL_GPL(cs4271_regmap_config);