linux-kernel - Re: [RESEND PATCH v3 02/17] media: v4l2-fwnode: Pass notifier to v4l2_async_register_fwnode

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Message-ID: <20200225150721.GO5379@paasikivi.fi.intel.com>
Date:   Tue, 25 Feb 2020 17:07:21 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.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>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RESEND PATCH v3 02/17] media: v4l2-fwnode: Pass notifier to
 v4l2_async_register_fwnode_subdev()

Hi Steve,

On Sat, Feb 15, 2020 at 11:41:21AM -0800, Steve Longerbeam wrote:
> Instead of allocating a notifier in v4l2_async_register_fwnode_subdev(),
> have the caller provide one. This allows the caller to implement
> notifier ops (bind, unbind).
> 
> The caller is now responsible for first initializing its notifier with a
> call to v4l2_async_notifier_init().
> 
> Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>

Instead of improving v4l2_async_register_fwnode_subdev(), could you convert
the users (IMX driver in this case) to call the preferred APIs instead? As
the lines below show, v4l2_async_register_fwnode_subdev() has only two
users left --- the other one of which is the IMX driver. After converting
these two, we could just remove this API.

See e.g. drivers/media/pci/intel/ipu3/ipu3-cio2.c and
drivers/media/platform/omap3isp/isp.c for examples.

> ---
> Changes in v3:
> - added the missing calls to unregister/cleanup the new subdev notifiers.
>   Reported by Rui Silva.
> ---
>  drivers/media/platform/video-mux.c         |  8 +++++++-
>  drivers/media/v4l2-core/v4l2-fwnode.c      | 11 +----------
>  drivers/staging/media/imx/imx6-mipi-csi2.c |  7 ++++++-
>  drivers/staging/media/imx/imx7-media-csi.c |  7 ++++++-
>  drivers/staging/media/imx/imx7-mipi-csis.c |  9 ++++++++-
>  include/media/v4l2-fwnode.h                | 12 ++++++++----
>  6 files changed, 36 insertions(+), 18 deletions(-)

-- 
Kind regards,

Sakari Ailus