ASoC: ssm2518: Add explicit device tree support

Add OF match table to SSM2518 to allow direct matching without going
through I2C subsystem.

Signed-off-by: Ricard Wanderlof <ricardw@axis.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/ssm2518.c

@@ -806,6 +806,14 @@ static int ssm2518_i2c_remove(struct i2c_client *client)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id ssm2518_dt_ids[] = {
+	{ .compatible = "adi,ssm2518", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ssm2518_dt_ids);
+#endif
+
 static const struct i2c_device_id ssm2518_i2c_ids[] = {
 	{ "ssm2518", 0 },
 	{ }
@@ -815,6 +823,7 @@ MODULE_DEVICE_TABLE(i2c, ssm2518_i2c_ids);
 static struct i2c_driver ssm2518_driver = {
 	.driver = {
 		.name = "ssm2518",
+		.of_match_table = of_match_ptr(ssm2518_dt_ids),
 	},
 	.probe = ssm2518_i2c_probe,
 	.remove = ssm2518_i2c_remove,