linux-kernel - [PATCH v4 1/3] media: i2c: ov772x: Parse endpoint properties

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Message-Id: <20200913184247.618-2-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date:   Sun, 13 Sep 2020 19:42:45 +0100
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Jacopo Mondi <jacopo@...ndi.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: [PATCH v4 1/3] media: i2c: ov772x: Parse endpoint properties

Parse endpoint properties using v4l2_fwnode_endpoint_alloc_parse()
to determine bus-type and store it locally in priv data.

Also for backward compatibility with the existing DT where bus-type
isnt specified fallback to V4L2_MBUS_PARALLEL.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/media/i2c/ov772x.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c
index 2cc6a678069a..551082aa7026 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
+	enum v4l2_mbus_type		  bus_type;
 };
 
 /*
@@ -1354,6 +1356,8 @@ static const struct v4l2_subdev_ops ov772x_subdev_ops = {
 
 static int ov772x_probe(struct i2c_client *client)
 {
+	struct v4l2_fwnode_endpoint bus_cfg = { .bus_type = 0 };
+	struct fwnode_handle	*ep;
 	struct ov772x_priv	*priv;
 	int			ret;
 	static const struct regmap_config ov772x_regmap_config = {
@@ -1415,6 +1419,26 @@ static int ov772x_probe(struct i2c_client *client)
 		goto error_clk_put;
 	}
 
+	ep = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev),
+					    NULL);
+	if (!ep) {
+		dev_err(&client->dev, "endpoint node not found\n");
+		ret = -EINVAL;
+		goto error_clk_put;
+	}
+
+	bus_cfg.bus_type = V4L2_MBUS_PARALLEL;
+	ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
+	priv->bus_type = bus_cfg.bus_type;
+	v4l2_fwnode_endpoint_free(&bus_cfg);
+	if (ret) {
+		/* For backward compatibility with the existing DT where
+		 * bus-type isnt specified fallback to V4L2_MBUS_PARALLEL
+		 */
+		priv->bus_type = V4L2_MBUS_PARALLEL;
+		dev_notice(&client->dev, "Falling back to V4L2_MBUS_PARALLEL mode\n");
+	}
+
 	ret = ov772x_video_probe(priv);
 	if (ret < 0)
 		goto error_gpio_put;
-- 
2.17.1