diff --git a/drivers/pinctrl/pinctrl-loongson2.c b/drivers/pinctrl/pinctrl-loongson2.c
index 3c74f9890..91f59be9b 100644
--- a/drivers/pinctrl/pinctrl-loongson2.c
+++ b/drivers/pinctrl/pinctrl-loongson2.c
@@ -458,18 +458,18 @@ static int ls2k_pmx_set_mux(struct pinctrl_dev *pcdev, unsigned int func_num,
 	return ret;
 }
 
-int ls2k_pmx_get_funcs_count(struct pinctrl_dev *pcdev)
+static int ls2k_pmx_get_funcs_count(struct pinctrl_dev *pcdev)
 {
 	return ARRAY_SIZE(ls2k_pmx_functions);
 }
 
-const char *ls2k_pmx_get_func_name(struct pinctrl_dev *pcdev,
+static const char *ls2k_pmx_get_func_name(struct pinctrl_dev *pcdev,
 				    unsigned int selector)
 {
 	return ls2k_pmx_functions[selector].name;
 }
 
-int ls2k_pmx_get_groups(struct pinctrl_dev *pcdev, unsigned int selector,
+static int ls2k_pmx_get_groups(struct pinctrl_dev *pcdev, unsigned int selector,
 			 const char * const **groups,
 			 unsigned int * const num_groups)
 {
@@ -486,7 +486,7 @@ const struct pinmux_ops ls2k_pmx_ops = {
 	.get_function_groups = ls2k_pmx_get_groups,
 };
 
-int ls2k_pinctrl_probe(struct platform_device *pdev)
+static int ls2k_pinctrl_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct ls2k_pinctrl *pctrl;