linux-kernel - Re: [PATCH 04/22] media: Move v4l2_fwnode_parse

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Date:   Tue, 6 Aug 2019 09:53:41 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linux Media Mailing List <linux-media@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Hyun Kwon <hyun.kwon@...inx.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        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>,
        Len Brown <lenb@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Enrico Weigelt <info@...ux.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/ZYNQ ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
        "open list:ACPI" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH 04/22] media: Move v4l2_fwnode_parse_link from v4l2 to
 driver base

Hi Andy,

On 8/5/19 11:41 PM, Andy Shevchenko wrote:
> On Tue, Aug 6, 2019 at 2:37 AM Steve Longerbeam <slongerbeam@...il.com> wrote:
>> There is nothing v4l2-specific about v4l2_fwnode_{parse|put}_link().
>> Make these functions more generally available by moving them to driver
>> base, with the appropriate name changes to the functions and struct.
>>
>> In the process embed a 'struct fwnode_endpoint' in 'struct fwnode_link'
>> for both sides of the link, and make use of fwnode_graph_parse_endpoint()
>> to fully parse both endpoints. Rename members local_node and
>> remote_node to more descriptive local_port_parent and
>> remote_port_parent.
>>
> May I ask if it's going to be used outside of v4l2?

It could be, I can see fwnode_graph_parse_link() being useful in DRM, 
for example. But at this, only media core and v4l2 are making use of it.

This patch was created so that fwnode links can be parsed in a new media 
core function that forms media links from fwnode links.

The full patchset doesn't seem to be up yet, but see [1] for the cover 
letter.

Steve

[1] https://www.mail-archive.com/linux-media@vger.kernel.org/msg148910.html