ASoC: cs42l51: re-hook of_match_table pointer

In commit a1253ef6d3fa ("ASoC: cs42l51: split i2c from codec driver"),
the I2C part of the CS42L51 was moved to a separate file, but the
definition of the of_device_id array was left in the driver file
itself, no longer connected to the platform_driver structure using the
.of_match_table pointer.

This commit exports the of_device_id array in cs42l51, and uses it as
.of_match_able in cs42l51-i2c.c. This solution was suggested by Brian
Austin.

Fixes: a1253ef6d3fa ("ASoC: cs42l51: split i2c from codec driver")
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: <stable@vger.kernel.org>

sound/soc/codecs/cs42l51-i2c.c

@@ -46,6 +46,7 @@ static struct i2c_driver cs42l51_i2c_driver = {
 	.driver = {
 		.name = "cs42l51",
 		.owner = THIS_MODULE,
+		.of_match_table = cs42l51_of_match,
 	},
 	.probe = cs42l51_i2c_probe,
 	.remove = cs42l51_i2c_remove,

sound/soc/codecs/cs42l51.c

@@ -558,11 +558,13 @@ error:
 }
 EXPORT_SYMBOL_GPL(cs42l51_probe);
 
-static const struct of_device_id cs42l51_of_match[] = {
+const struct of_device_id cs42l51_of_match[] = {
 	{ .compatible = "cirrus,cs42l51", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, cs42l51_of_match);
+EXPORT_SYMBOL_GPL(cs42l51_of_match);
+
 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 MODULE_DESCRIPTION("Cirrus Logic CS42L51 ALSA SoC Codec Driver");
 MODULE_LICENSE("GPL");

sound/soc/codecs/cs42l51.h

@@ -22,6 +22,7 @@ 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