From: Jacopo Mondi <jacopo@jmondi.org>
To: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>,
Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-renesas-soc@vger.kernel.org,
Biju Das <biju.das.jz@bp.renesas.com>,
Prabhakar <prabhakar.csengg@gmail.com>
Subject: Re: [PATCH v5 1/3] media: i2c: ov772x: Parse endpoint properties
Date: Wed, 16 Sep 2020 10:30:32 +0200 [thread overview]
Message-ID: <20200916083032.yif4veaf3n44hkpf@uno.localdomain> (raw)
In-Reply-To: <20200916074737.phc6atpsahxowfjt@uno.localdomain>
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
> >
next prev parent reply other threads:[~2020-09-16 8:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-15 17:42 [PATCH v5 0/3] media: i2c: ov772x: Enable BT.656 mode and test pattern support Lad Prabhakar
2020-09-15 17:42 ` [PATCH v5 1/3] media: i2c: ov772x: Parse endpoint properties Lad Prabhakar
2020-09-16 7:47 ` Jacopo Mondi
2020-09-16 8:30 ` Jacopo Mondi [this message]
2020-09-15 17:42 ` [PATCH v5 2/3] media: i2c: ov772x: Add support for BT.656 mode Lad Prabhakar
2020-09-16 8:24 ` Jacopo Mondi
2020-09-15 17:42 ` [PATCH v5 3/3] media: i2c: ov772x: Add test pattern control Lad Prabhakar
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