ASoC: wm8978: Add OF device ID table

The driver doesn't have a struct of_device_id table but supported devices
are registered via Device Trees. This is working on the assumption that a
I2C device registered via OF will always match a legacy I2C device ID and
that the MODALIAS reported will always be of the form i2c:<device>.

But this could change in the future so the correct approach is to have an
OF device ID table if the devices are registered via OF.

Before this patch:

$ modinfo sound/soc/codecs/snd-soc-wm8978.ko | grep alias
alias:          i2c:wm8978

After this patch:

$ modinfo sound/soc/codecs/snd-soc-wm8978.ko | grep alias
alias:          i2c:wm8978
alias:          of:N*T*Cwlf,wm8978C*
alias:          of:N*T*Cwlf,wm8978

Signed-off-by: Javier Martinez Canillas <[email protected]>
Acked-by: Charles Keepax <[email protected]>
Signed-off-by: Mark Brown <[email protected]>

diff --git a/sound/soc/codecs/wm8978.c b/sound/soc/codecs/wm8978.c
index 90b2d418ef606247da30944b82190b92bb1e9db1..cf761e2d754692b4157eb41b1ee8544c8fde6879 100644 (file)
--- a/sound/soc/codecs/wm8978.c
+++ b/sound/soc/codecs/wm8978.c
@@ -1071,9 +1071,16 @@ static const struct i2c_device_id wm8978_i2c_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, wm8978_i2c_id);
 
+static const struct of_device_id wm8978_of_match[] = {
+       { .compatible = "wlf,wm8978", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, wm8978_of_match);
+
 static struct i2c_driver wm8978_i2c_driver = {
        .driver = {
                .name = "wm8978",
+               .of_match_table = wm8978_of_match,
        },
        .probe =    wm8978_i2c_probe,
        .remove =   wm8978_i2c_remove,