diff --git a/sound/soc/codecs/rt5663.c b/sound/soc/codecs/rt5663.c
index 8078abcaf728..90a6ad5821f6 100644
--- a/sound/soc/codecs/rt5663.c
+++ b/sound/soc/codecs/rt5663.c
@@ -1364,7 +1364,7 @@ static const char * const rt5663_if1_adc_data_select[] = {
 	"L/R", "R/L", "L/L", "R/R"
 };
 
-static const SOC_ENUM_SINGLE_DECL(rt5663_if1_adc_enum, RT5663_TDM_2,
+static SOC_ENUM_SINGLE_DECL(rt5663_if1_adc_enum, RT5663_TDM_2,
 	RT5663_DATA_SWAP_ADCDAT1_SHIFT, rt5663_if1_adc_data_select);
 
 static void rt5663_enable_push_button_irq(struct snd_soc_codec *codec,
@@ -1574,7 +1574,7 @@ static int rt5663_jack_detect(struct snd_soc_codec *codec, int jack_insert)
 	return rt5663->jack_type;
 }
 
-int rt5663_button_detect(struct snd_soc_codec *codec)
+static int rt5663_button_detect(struct snd_soc_codec *codec)
 {
 	int btn_type, val;
 
@@ -2857,7 +2857,7 @@ static int rt5663_resume(struct snd_soc_codec *codec)
 #define RT5663_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
 			SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S8)
 
-struct snd_soc_dai_ops rt5663_aif_dai_ops = {
+static struct snd_soc_dai_ops rt5663_aif_dai_ops = {
 	.hw_params = rt5663_hw_params,
 	.set_fmt = rt5663_set_dai_fmt,
 	.set_sysclk = rt5663_set_dai_sysclk,
@@ -2866,7 +2866,7 @@ struct snd_soc_dai_ops rt5663_aif_dai_ops = {
 	.set_bclk_ratio = rt5663_set_bclk_ratio,
 };
 
-struct snd_soc_dai_driver rt5663_dai[] = {
+static struct snd_soc_dai_driver rt5663_dai[] = {
 	{
 		.name = "rt5663-aif",
 		.id = RT5663_AIF,
@@ -3193,14 +3193,14 @@ static int rt5663_i2c_remove(struct i2c_client *i2c)
 	return 0;
 }
 
-void rt5663_i2c_shutdown(struct i2c_client *client)
+static void rt5663_i2c_shutdown(struct i2c_client *client)
 {
 	struct rt5663_priv *rt5663 = i2c_get_clientdata(client);
 
 	regmap_write(rt5663->regmap, RT5663_RESET, 0);
 }
 
-struct i2c_driver rt5663_i2c_driver = {
+static struct i2c_driver rt5663_i2c_driver = {
 	.driver = {
 		.name = "rt5663",
 		.owner = THIS_MODULE,