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

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Date:   Mon, 14 Sep 2020 19:26:19 +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>,
        Laurent Pinchart <laurent.pinchart+renesas@...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 v4 1/3] media: i2c: ov772x: Parse endpoint properties

Hi Sakari,

THank you for the review.

On Mon, Sep 14, 2020 at 7:54 AM Sakari Ailus
<sakari.ailus@...ux.intel.com> wrote:
>
> Hi Prabhakar,
>
> Thanks for the patchset.
>
> On Sun, Sep 13, 2020 at 07:42:45PM +0100, Lad Prabhakar wrote:
> > 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
>
> "isn't", "fall back", and a period, please.
>
Will fix that.

> > +              */
> > +             priv->bus_type = V4L2_MBUS_PARALLEL;
> > +             dev_notice(&client->dev, "Falling back to V4L2_MBUS_PARALLEL mode\n");
>
> I'd just use dev_dbg().
>
OK will switch to dev_dbg()

Cheers,
Prabhakar