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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "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 4.9 112/219] ASoC: ssm4567: Add OF device ID table
Thread-Topic: [PATCH AUTOSEL for 4.9 112/219] ASoC: ssm4567: Add OF device ID
 table
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Date:   Sat, 3 Mar 2018 22:29:00 +0000
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From: Javier Martinez Canillas <javier@osg.samsung.com>

[ Upstream commit 71c314d7ef2442cd798584a3dece8151215e1777 ]

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-ssm4567.ko | grep alias
alias:          acpi*:INT343B:*
alias:          i2c:ssm4567

After this patch:

$ modinfo sound/soc/codecs/snd-soc-ssm4567.ko | grep alias
alias:          acpi*:INT343B:*
alias:          of:N*T*Cadi,ssm4567C*
alias:          of:N*T*Cadi,ssm4567
alias:          i2c:ssm4567

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 sound/soc/codecs/ssm4567.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sound/soc/codecs/ssm4567.c b/sound/soc/codecs/ssm4567.c
index 2bb5a11c9ba1..a622623e8558 100644
--- a/sound/soc/codecs/ssm4567.c
+++ b/sound/soc/codecs/ssm4567.c
@@ -485,6 +485,14 @@ static const struct i2c_device_id ssm4567_i2c_ids[] =
=3D {
 };
 MODULE_DEVICE_TABLE(i2c, ssm4567_i2c_ids);
=20
+#ifdef CONFIG_OF
+static const struct of_device_id ssm4567_of_match[] =3D {
+	{ .compatible =3D "adi,ssm4567", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ssm4567_of_match);
+#endif
+
 #ifdef CONFIG_ACPI
=20
 static const struct acpi_device_id ssm4567_acpi_match[] =3D {
@@ -498,6 +506,7 @@ MODULE_DEVICE_TABLE(acpi, ssm4567_acpi_match);
 static struct i2c_driver ssm4567_driver =3D {
 	.driver =3D {
 		.name =3D "ssm4567",
+		.of_match_table =3D of_match_ptr(ssm4567_of_match),
 		.acpi_match_table =3D ACPI_PTR(ssm4567_acpi_match),
 	},
 	.probe =3D ssm4567_i2c_probe,
--=20
2.14.1