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From:   Sasha Levin <Alexander.Levin@microsoft.com>
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        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Javier Martinez Canillas <javier@osg.samsung.com>,
        Mark Brown <broonie@kernel.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 113/219] ASoC: wm8978: Add OF device ID table
Thread-Topic: [PATCH AUTOSEL for 4.9 113/219] ASoC: wm8978: Add OF device ID
 table
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Date:   Sat, 3 Mar 2018 22:29:01 +0000
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From: Javier Martinez Canillas <javier@osg.samsung.com>

[ Upstream commit 5cf015d9cb02c360582b624497b0a1716881cf28 ]

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 <javier@osg.samsung.com>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 sound/soc/codecs/wm8978.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sound/soc/codecs/wm8978.c b/sound/soc/codecs/wm8978.c
index 90b2d418ef60..cf761e2d7546 100644
--- 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[] =
=3D {
 };
 MODULE_DEVICE_TABLE(i2c, wm8978_i2c_id);
=20
+static const struct of_device_id wm8978_of_match[] =3D {
+	{ .compatible =3D "wlf,wm8978", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, wm8978_of_match);
+
 static struct i2c_driver wm8978_i2c_driver =3D {
 	.driver =3D {
 		.name =3D "wm8978",
+		.of_match_table =3D wm8978_of_match,
 	},
 	.probe =3D    wm8978_i2c_probe,
 	.remove =3D   wm8978_i2c_remove,
--=20
2.14.1