linux-kernel - Re: [PATCH 15/22] media: imx7-media-csi: Create media links in bound notifier

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Date:   Mon, 02 Sep 2019 10:38:59 +0100
From:   Rui Miguel Silva <rmfrfs@...il.com>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     linux-media@...r.kernel.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        "open list\:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
        "moderated list\:ARM\/FREESCALE IMX \/ MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 15/22] media: imx7-media-csi: Create media links in bound notifier

Hi Steve,
On Tue 06 Aug 2019 at 00:34, Steve Longerbeam wrote:
> Implement a notifier bound op to register media links from the remote
> sub-device's source pad(s) to the CSI sink pad.
>
> Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
> ---
>  drivers/staging/media/imx/imx7-media-csi.c | 24 ++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>
> diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
> index a1c96c52a606..f71ac485f780 100644
> --- a/drivers/staging/media/imx/imx7-media-csi.c
> +++ b/drivers/staging/media/imx/imx7-media-csi.c
> @@ -196,6 +196,11 @@ struct imx7_csi {
>  	struct completion last_eof_completion;
>  };
>
> +static inline struct imx7_csi *notifier_to_dev(struct v4l2_async_notifier *n)
>

As the other one add the namespace for the function name:
imx7_csi_notifier_to_dev

other than this, looks good to me.

Cheers,
  Rui
> +{
> +	return container_of(n, struct imx7_csi, notifier);
> +}
> +
>  static u32 imx7_csi_reg_read(struct imx7_csi *csi, unsigned int offset)
>  {
>  	return readl(csi->regbase + offset);
> @@ -1173,6 +1178,23 @@ static int imx7_csi_parse_endpoint(struct device *dev,
>  	return fwnode_device_is_available(asd->match.fwnode) ? 0 : -EINVAL;
>  }
>
> +static int imx7_csi_notify_bound(struct v4l2_async_notifier *notifier,
> +				 struct v4l2_subdev *sd,
> +				 struct v4l2_async_subdev *asd)
> +{
> +	struct imx7_csi *csi = notifier_to_dev(notifier);
> +	struct media_pad *sink = &csi->sd.entity.pads[IMX7_CSI_PAD_SINK];
> +
> +	return media_create_fwnode_pad_links(sink,
> +					     dev_fwnode(csi->sd.dev),
> +					     &sd->entity,
> +					     dev_fwnode(sd->dev), 0);
> +}
> +
> +static const struct v4l2_async_notifier_operations imx7_csi_notify_ops = {
> +	.bound = imx7_csi_notify_bound,
> +};
> +
>  static int imx7_csi_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -1253,6 +1275,8 @@ static int imx7_csi_probe(struct platform_device *pdev)
>
>  	v4l2_async_notifier_init(&csi->notifier);
>
> +	csi->notifier.ops = &imx7_csi_notify_ops;
> +
>  	ret = v4l2_async_register_fwnode_subdev(&csi->sd, &csi->notifier,
>  						sizeof(struct v4l2_async_subdev),
>  						NULL, 0,