linux-kernel - Re: [PATCH v6 1/3] media: i2c: ov772x: Parse endpoint properties

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Date:   Wed, 30 Sep 2020 13:19:40 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v6 1/3] media: i2c: ov772x: Parse endpoint properties

HI Sakari,

Thank you for the review.

On Wed, Sep 30, 2020 at 12:45 PM Sakari Ailus
<sakari.ailus@...ux.intel.com> wrote:
>
> Hi Prabhakar,
>
> On Thu, Sep 17, 2020 at 06:42:22PM +0100, Lad Prabhakar wrote:
> > 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
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> >  drivers/media/i2c/ov772x.c | 34 ++++++++++++++++++++++++++++++++++
> >  1 file changed, 34 insertions(+)
> >
> > diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c
> > index 2cc6a678069a..f61a3f09ad64 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;
> >  };
> >
> >  /*
> > @@ -1348,6 +1350,34 @@ static const struct v4l2_subdev_ops ov772x_subdev_ops = {
> >       .pad    = &ov772x_subdev_pad_ops,
> >  };
> >
> > +static int ov772x_parse_dt(struct i2c_client *client,
> > +                        struct ov772x_priv *priv)
> > +{
> > +     struct v4l2_fwnode_endpoint bus_cfg;
> > +     struct fwnode_handle *ep;
> > +     int ret;
> > +
> > +     ep = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev),
> > +                                         NULL);
> > +     if (!ep) {
> > +             dev_err(&client->dev, "Endpoint node not found\n");
> > +             return -EINVAL;
> > +     }
> > +
> > +     bus_cfg.bus_type = V4L2_MBUS_PARALLEL;
>
> Please zero the entire struct, i.e. do this assignment in the declaration.
>
Agreed, but instead at the declaration I would prefer here as below,
since patch 2/3 has a comment related to backward compatibility with
the bindings. Is this OK with you ?
    bus_cfg = (struct v4l2_fwnode_endpoint)
          { .bus_type = V4L2_MBUS_PARALLEL };

> You can also use v4l2_fwnode_endpoint_parse() if you're not using the link
> frequencies --- sensor drivers generally should but you could only add them
> as optional at this point (out of scope of this patch).
>
will stick with this for now :)

Cheers,
Prabhakar