[media] media: adv7604: ability to read default input port from DT

Adds support to the adv7604 driver for specifying the default input
port in the Device tree. If no value is provided, the driver will be
unable to select an input without help from userspace.

Tested-by: William Towle <william.towle@codethink.co.uk>
Signed-off-by: Ian Molton <ian.molton@codethink.co.uk>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/i2c/adv7604.c

@@ -2772,6 +2772,7 @@ static int adv76xx_parse_dt(struct adv76xx_state *state)
 	struct device_node *endpoint;
 	struct device_node *np;
 	unsigned int flags;
+	u32 v;
 
 	np = state->i2c_clients[ADV76XX_PAGE_IO]->dev.of_node;
 
@@ -2781,6 +2782,12 @@ static int adv76xx_parse_dt(struct adv76xx_state *state)
 		return -EINVAL;
 
 	v4l2_of_parse_endpoint(endpoint, &bus_cfg);
+
+	if (!of_property_read_u32(endpoint, "default-input", &v))
+		state->pdata.default_input = v;
+	else
+		state->pdata.default_input = -1;
+
 	of_node_put(endpoint);
 
 	flags = bus_cfg.bus.parallel.flags;
@@ -2819,7 +2826,6 @@ static int adv76xx_parse_dt(struct adv76xx_state *state)
 	/* Hardcode the remaining platform data fields. */
 	state->pdata.disable_pwrdnb = 0;
 	state->pdata.disable_cable_det_rst = 0;
-	state->pdata.default_input = -1;
 	state->pdata.blank_data = 1;
 	state->pdata.alt_data_sat = 1;
 	state->pdata.op_format_mode_sel = ADV7604_OP_FORMAT_MODE0;