media: adv7180: add g_frame_interval support

Implement g_frame_interval to return the current standard's frame
interval.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/i2c/adv7180.c

@@ -461,6 +461,22 @@ static int adv7180_g_std(struct v4l2_subdev *sd, v4l2_std_id *norm)
 	return 0;
 }
 
+static int adv7180_g_frame_interval(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_frame_interval *fi)
+{
+	struct adv7180_state *state = to_state(sd);
+
+	if (state->curr_norm & V4L2_STD_525_60) {
+		fi->interval.numerator = 1001;
+		fi->interval.denominator = 30000;
+	} else {
+		fi->interval.numerator = 1;
+		fi->interval.denominator = 25;
+	}
+
+	return 0;
+}
+
 static void adv7180_set_power_pin(struct adv7180_state *state, bool on)
 {
 	if (!state->pwdn_gpio)
@@ -820,6 +836,7 @@ static int adv7180_subscribe_event(struct v4l2_subdev *sd,
 static const struct v4l2_subdev_video_ops adv7180_video_ops = {
 	.s_std = adv7180_s_std,
 	.g_std = adv7180_g_std,
+	.g_frame_interval = adv7180_g_frame_interval,
 	.querystd = adv7180_querystd,
 	.g_input_status = adv7180_g_input_status,
 	.s_routing = adv7180_s_routing,