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SubjectRe: [PATCH v5 1/3] media: i2c: ov772x: Parse endpoint properties
Hi Prabhakar,
sorry, two more tiny nits

On Wed, Sep 16, 2020 at 09:47:37AM +0200, Jacopo Mondi wrote:
> Hi Prabhakar,
>
> On Tue, Sep 15, 2020 at 06:42:33PM +0100, Lad Prabhakar wrote:
> > Parse endpoint properties using v4l2_fwnode_endpoint_alloc_parse()
> > to determine bus-type and store it locally in priv data.
> >
> > v4l2_fwnode_endpoint_alloc_parse() with bus_type set to
> > V4L2_MBUS_PARALLEL falls back to V4L2_MBUS_PARALLEL thus handling
> > backward compatibility with existing DT where bus-type isn't specified.
>
>
> I don't think this is necessary here. This patch does not need to
> handle any retrocompatibility, as only PARALLEL is supported.
>
> The 'right' way to put it to me would be
> "Parse endpoint properties using v4l2_fwnode_endpoint_alloc_parse()
> to determine the bus type and store it in the driver structure.
>
> Set bus_type to V4L2_MBUS_PARALLEL as it's the only supported one"
>
> See comment in the next patch for retrocompatibility
>
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> > drivers/media/i2c/ov772x.c | 25 +++++++++++++++++++++++++
> > 1 file changed, 25 insertions(+)
> >
> > diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c
> > index 2cc6a678069a..4ab4b3c883d0 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;
> > + struct fwnode_handle *ep;
> > struct ov772x_priv *priv;
> > int ret;
> > static const struct regmap_config ov772x_regmap_config = {
> > @@ -1415,6 +1419,27 @@ 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");

Nit: other error messages in the driver start with a capital letter,

> > + ret = -EINVAL;
> > + goto error_clk_put;
> > + }
> > +
> > + /* For backward compatibility with the existing DT where
> > + * bus-type isn't specified v4l2_fwnode_endpoint_alloc_parse()
> > + * with bus_type set to V4L2_MBUS_PARALLEL falls back to
> > + * V4L2_MBUS_PARALLEL
> > + */
>
> You can drop this comment block
>

Or better move it to the next patch. Two nits in the meantime:

Use
/*
* This

in place of

/* This

And I would write it as something like

/*
* For backward compatibility with older DTS where the
* bus-type property was not mandatory, assume
* V4L2_MBUS_PARALLEL as it was the only supported bus at the
* time. v4l2_fwnode_endpoint_alloc_parse() will not fail if
* 'bus-type' is not specified.
*/

Thanks
j

> > + bus_cfg.bus_type = V4L2_MBUS_PARALLEL;
> > + ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
> > + priv->bus_type = bus_cfg.bus_type;
>
> Set this after if (ret)
>
> > + v4l2_fwnode_endpoint_free(&bus_cfg);
> > + fwnode_handle_put(ep);
> > + if (ret)
> > + goto error_clk_put;
> > +
> > ret = ov772x_video_probe(priv);
> > if (ret < 0)
> > goto error_gpio_put;
> > --
> > 2.17.1
> >

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