--- zzzz-none-000/linux-3.10.107/sound/soc/codecs/cs42l51.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/sound/soc/codecs/cs42l51.h	2021-02-04 17:41:59.000000000 +0000
@@ -18,9 +18,16 @@
 #ifndef _CS42L51_H
 #define _CS42L51_H
 
+struct device;
+
+extern const struct regmap_config cs42l51_regmap;
+int cs42l51_probe(struct device *dev, struct regmap *regmap);
+extern const struct of_device_id cs42l51_of_match[];
+
 #define CS42L51_CHIP_ID			0x1B
 #define CS42L51_CHIP_REV_A		0x00
 #define CS42L51_CHIP_REV_B		0x01
+#define CS42L51_CHIP_REV_MASK		0x07
 
 #define CS42L51_CHIP_REV_ID		0x01
 #define CS42L51_MK_CHIP_REV(a, b)	((a)<<3|(b))