diff --git a/sound/soc/codecs/tlv320aic31xx.c b/sound/soc/codecs/tlv320aic31xx.c
index dcdc5751..d3517a9 100644
--- a/sound/soc/codecs/tlv320aic31xx.c
+++ b/sound/soc/codecs/tlv320aic31xx.c
@@ -129,7 +129,7 @@
 	},
 };
 
-struct regmap_config aic31xx_i2c_regmap = {
+static const struct regmap_config aic31xx_i2c_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.writeable_reg = aic31xx_writeable,
@@ -321,9 +321,9 @@
 static const struct snd_kcontrol_new rdac_in_control =
 	SOC_DAPM_ENUM("DAC Right Input", rdac_in_enum);
 
-int aic31xx_wait_bits(struct aic31xx_priv *aic31xx, unsigned int reg,
-		      unsigned int mask, unsigned int wbits, int sleep,
-		      int count)
+static int aic31xx_wait_bits(struct aic31xx_priv *aic31xx, unsigned int reg,
+			     unsigned int mask, unsigned int wbits, int sleep,
+			     int count)
 {
 	unsigned int bits;
 	int counter = count;
@@ -1177,7 +1177,7 @@
 }
 #endif /* CONFIG_OF */
 
-void aic31xx_device_init(struct aic31xx_priv *aic31xx)
+static void aic31xx_device_init(struct aic31xx_priv *aic31xx)
 {
 	int ret, i;