iio: frequency: adf4350: Add OF match table

The Documentation/devicetree/bindings/iio/frequency/adf4350.txt DT binding
doc lists "adi,adf4350" or "adi,adf4351" as compatible strings but the
corresponding driver does not have an OF match table. Add the table to the
driver so the SPI core can do an OF style match.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/frequency/adf4350.c

@@ -616,6 +616,13 @@ static int adf4350_remove(struct spi_device *spi)
 	return 0;
 }
 
+static const struct of_device_id adf4350_of_match[] = {
+	{ .compatible = "adi,adf4350", },
+	{ .compatible = "adi,adf4351", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, adf4350_of_match);
+
 static const struct spi_device_id adf4350_id[] = {
 	{"adf4350", 4350},
 	{"adf4351", 4351},
@@ -625,6 +632,7 @@ static const struct spi_device_id adf4350_id[] = {
 static struct spi_driver adf4350_driver = {
 	.driver = {
 		.name	= "adf4350",
+		.of_match_table = of_match_ptr(adf4350_of_match),
 		.owner	= THIS_MODULE,
 	},
 	.probe		= adf4350_probe,