Input: synaptics_i2c - 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.
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/mouse/synaptics_i2c.c

@@ -652,9 +652,18 @@ static const struct i2c_device_id synaptics_i2c_id_table[] = {
 };
 MODULE_DEVICE_TABLE(i2c, synaptics_i2c_id_table);
 
+#ifdef CONFIG_OF
+static const struct of_device_id synaptics_i2c_of_match[] = {
+	{ .compatible = "synaptics,synaptics_i2c", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, synaptics_i2c_of_match);
+#endif
+
 static struct i2c_driver synaptics_i2c_driver = {
 	.driver = {
 		.name	= DRIVER_NAME,
+		.of_match_table = of_match_ptr(synaptics_i2c_of_match),
 		.pm	= &synaptics_i2c_pm,
 	},