linux-kernel - [PATCH v3 1/2] media: i2c: ov772x: Add support for BT656 mode

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Date:   Mon, 24 Aug 2020 20:04:05 +0100
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Jacopo Mondi <jacopo@...ndi.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@....fi>,
        Hans Verkuil <hverkuil@...all.nl>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: [PATCH v3 1/2] media: i2c: ov772x: Add support for BT656 mode

Add support to read the bus-type and enable BT656 mode if needed.

Also fail probe if unsupported bus_type is detected.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
---
 drivers/media/i2c/ov772x.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c
index 2cc6a678069a..67764d647526 100644
--- a/drivers/media/i2c/ov772x.c
+++ b/drivers/media/i2c/ov772x.c
@@ -31,6 +31,7 @@
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-event.h>
+#include <media/v4l2-fwnode.h>
 #include <media/v4l2-image-sizes.h>
 #include <media/v4l2-subdev.h>
 
@@ -434,6 +435,7 @@ struct ov772x_priv {
 #ifdef CONFIG_MEDIA_CONTROLLER
 	struct media_pad pad;
 #endif
+	struct v4l2_fwnode_endpoint ep;
 };
 
 /*
@@ -581,6 +583,13 @@ static int ov772x_s_stream(struct v4l2_subdev *sd, int enable)
 	if (priv->streaming == enable)
 		goto done;
 
+	if (priv->ep.bus_type == V4L2_MBUS_BT656) {
+		ret = regmap_update_bits(priv->regmap, COM7, ITU656_ON_OFF,
+					 enable ? ITU656_ON_OFF : ~ITU656_ON_OFF);
+		if (ret)
+			goto done;
+	}
+
 	ret = regmap_update_bits(priv->regmap, COM2, SOFT_SLEEP_MODE,
 				 enable ? 0 : SOFT_SLEEP_MODE);
 	if (ret)
@@ -1354,6 +1363,7 @@ static const struct v4l2_subdev_ops ov772x_subdev_ops = {
 
 static int ov772x_probe(struct i2c_client *client)
 {
+	struct fwnode_handle *endpoint;
 	struct ov772x_priv	*priv;
 	int			ret;
 	static const struct regmap_config ov772x_regmap_config = {
@@ -1415,6 +1425,28 @@ static int ov772x_probe(struct i2c_client *client)
 		goto error_clk_put;
 	}
 
+	endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev),
+						  NULL);
+	if (!endpoint) {
+		dev_err(&client->dev, "endpoint node not found\n");
+		ret = -EINVAL;
+		goto error_clk_put;
+	}
+
+	ret = v4l2_fwnode_endpoint_parse(endpoint, &priv->ep);
+	fwnode_handle_put(endpoint);
+	if (ret) {
+		dev_err(&client->dev, "Could not parse endpoint\n");
+		goto error_clk_put;
+	}
+
+	if (priv->ep.bus_type != V4L2_MBUS_PARALLEL &&
+	    priv->ep.bus_type != V4L2_MBUS_BT656) {
+		dev_err(&client->dev, "Unsupported bus type %d\n",
+			priv->ep.bus_type);
+		goto error_clk_put;
+	}
+
 	ret = ov772x_video_probe(priv);
 	if (ret < 0)
 		goto error_gpio_put;
-- 
2.17.1