Input: silead - 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.

As pointed by Hans de Goede, there's no mssl1680 and this is just used in
some ACPI systems to identify the gsl1680 chip. So isn't included in the
OF device ID table since a DT should use the proper device name instead.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/silead.c

@@ -580,12 +580,25 @@ static const struct acpi_device_id silead_ts_acpi_match[] = {
 MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
 #endif
 
+#ifdef CONFIG_OF
+static const struct of_device_id silead_ts_of_match[] = {
+	{ .compatible = "silead,gsl1680" },
+	{ .compatible = "silead,gsl1688" },
+	{ .compatible = "silead,gsl3670" },
+	{ .compatible = "silead,gsl3675" },
+	{ .compatible = "silead,gsl3692" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, silead_ts_of_match);
+#endif
+
 static struct i2c_driver silead_ts_driver = {
 	.probe = silead_ts_probe,
 	.id_table = silead_ts_id,
 	.driver = {
 		.name = SILEAD_TS_NAME,
 		.acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
+		.of_match_table = of_match_ptr(silead_ts_of_match),
 		.pm = &silead_ts_pm,
 	},
 };