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

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Message-ID: <1842bf8f-4f97-6294-41db-74f9f8e2befd@gmail.com>
Date:   Wed, 14 Aug 2019 16:00:30 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Fabio Estevam <festevam@...il.com>,
        "open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        "open list:ACPI" <linux-acpi@...r.kernel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Len Brown <lenb@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        "moderated list:ARM/ZYNQ ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Enrico Weigelt <info@...ux.net>,
        Hyun Kwon <hyun.kwon@...inx.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH 04/22] media: Move v4l2_fwnode_parse_link from v4l2 to
 driver base



On 8/14/19 3:04 PM, Russell King - ARM Linux admin wrote:
> On Wed, Aug 14, 2019 at 12:04:41PM -0700, Steve Longerbeam wrote:
>>
>> On 8/14/19 3:30 AM, Russell King - ARM Linux admin wrote:
>>> On Tue, Aug 06, 2019 at 09:53:41AM -0700, Steve Longerbeam wrote:
>>>> The full patchset doesn't seem to be up yet, but see [1] for the cover
>>>> letter.
>>> Was the entire series copied to the mailing lists, or just selected
>>> patches?  I only saw 4, 9, 11 and 13-22 via lakml.
>> The whole series was posted to the linux-media ML, see [1]. At the time,
>> none of the linux-media ML archives had the whole series.
>>
>>> In the absence of the other patches, will this solve imx-media binding
>>> the internal subdevs of sensor devices to the CSI2 interface?
>> "internal subdevs of sensor devices" ?? That doesn't make any sense.
> Sorry, but it makes complete sense when you consider that sensor
> devices may have more than one subdev, but there should be only one
> that is the "output" to whatever the camera is attached to.  The
> other subdevs are internal to the sensor.

Ah, thanks for the clarification. Yes, by "internal subdevs" I 
understand what you mean now. The adv748x and smiapp are examples.

>
> subdevs are not purely the remit of SoC drivers.

So there is no binding of internal subdevs to the receiver CSI-2. The 
receiver CSI-2 subdev will create media links to the subdev that has an 
externally exposed fwnode endpoint that connects with the CSI-2 sink pad.

Steve