diff --git a/sound/soc/codecs/cs35l36.c b/sound/soc/codecs/cs35l36.c
index e374fffb7e17c32caecdd0784faab93a3062d64e..dc8cf61b9db825879829c3f6b77976e62864c7c4 100644
--- a/sound/soc/codecs/cs35l36.c
+++ b/sound/soc/codecs/cs35l36.c
@@ -131,7 +131,7 @@ static const struct cs35l36_pll_config cs35l36_pll_sysclk[] = {
 	{27000000,	0x3F, 0x0A},
 };
 
-struct reg_default cs35l36_reg[] = {
+static struct reg_default cs35l36_reg[] = {
 	{CS35L36_TESTKEY_CTRL,			0x00000000},
 	{CS35L36_USERKEY_CTL,			0x00000000},
 	{CS35L36_OTP_CTRL1,			0x00002460},
@@ -244,7 +244,7 @@ struct reg_default cs35l36_reg[] = {
 	{CS35L36_PAC_INT7_CTRL,			0x00000001},
 };
 
-bool cs35l36_readable_reg(struct device *dev, unsigned int reg)
+static bool cs35l36_readable_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS35L36_SW_RESET:
@@ -394,7 +394,7 @@ bool cs35l36_readable_reg(struct device *dev, unsigned int reg)
 	}
 }
 
-bool cs35l36_precious_reg(struct device *dev, unsigned int reg)
+static bool cs35l36_precious_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS35L36_TESTKEY_CTRL:
@@ -406,7 +406,7 @@ bool cs35l36_precious_reg(struct device *dev, unsigned int reg)
 	}
 }
 
-bool cs35l36_volatile_reg(struct device *dev, unsigned int reg)
+static bool cs35l36_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS35L36_SW_RESET: