diff --git a/sound/soc/codecs/rt5640.c b/sound/soc/codecs/rt5640.c
index 178e55d4d481..914681978222 100644
--- a/sound/soc/codecs/rt5640.c
+++ b/sound/soc/codecs/rt5640.c
@@ -51,7 +51,7 @@ static const struct regmap_range_cfg rt5640_ranges[] = {
 	  .window_len = 0x1, },
 };
 
-static struct reg_default init_list[] = {
+static const struct reg_default init_list[] = {
 	{RT5640_PR_BASE + 0x3d,	0x3600},
 	{RT5640_PR_BASE + 0x12,	0x0aa8},
 	{RT5640_PR_BASE + 0x14,	0x0aaa},
@@ -59,7 +59,6 @@ static struct reg_default init_list[] = {
 	{RT5640_PR_BASE + 0x21,	0xe0e0},
 	{RT5640_PR_BASE + 0x23,	0x1804},
 };
-#define RT5640_INIT_REG_LEN ARRAY_SIZE(init_list)
 
 static const struct reg_default rt5640_reg[] = {
 	{ 0x00, 0x000e },
@@ -2122,7 +2121,7 @@ MODULE_DEVICE_TABLE(of, rt5640_of_match);
 #endif
 
 #ifdef CONFIG_ACPI
-static struct acpi_device_id rt5640_acpi_match[] = {
+static const struct acpi_device_id rt5640_acpi_match[] = {
 	{ "INT33CA", 0 },
 	{ "10EC5640", 0 },
 	{ "10EC5642", 0 },