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

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Date:   Thu, 15 Aug 2019 00:15:09 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Steve Longerbeam <slongerbeam@...il.com>
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 Wed, Aug 14, 2019 at 04:00:30PM -0700, Steve Longerbeam wrote:
> 
> 
> 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.

Maybe - with 5.2, I get:

- entity 15: imx6-mipi-csi2 (5 pads, 6 links)
             type V4L2 subdev subtype Unknown flags 0
             device node name /dev/v4l-subdev2
        pad0: Sink
...
                <- "imx219 0-0010":0 []
                <- "imx219 pixel 0-0010":0 []

Adding some debug in gives:

[   11.963362] imx-media: imx_media_create_of_links() for imx6-mipi-csi2
[   11.963396] imx-media: create_of_link(): /soc/aips-bus@...0000/iomuxc-gpr@...0000/ipu1_csi0_mux
[   11.963422] imx-media: create_of_link(): /soc/ipu@...0000
[   11.963450] imx-media: create_of_link(): /soc/ipu@...0000
[   11.963478] imx-media: create_of_link(): /soc/aips-bus@...0000/iomuxc-gpr@...0000/ipu2_csi1_mux
[   11.963489] imx-media: imx6-mipi-csi2:4 -> ipu2_csi1_mux:0
[   11.963522] imx-media: create_of_link(): /soc/aips-bus@...0000/i2c@...0000/camera@10
[   11.963533] imx-media: imx219 0-0010:0 -> imx6-mipi-csi2:0
[   11.963549] imx-media: imx_media_create_of_links() for imx219 pixel 0-0010
[   11.963577] imx-media: create_of_link(): /soc/aips-bus@...0000/mipi@...c000
[   11.963587] imx-media: imx219 pixel 0-0010:0 -> imx6-mipi-csi2:0
[   11.963602] imx-media: imx_media_create_of_links() for imx219 0-0010

Note that it's not created by imx6-mipi-csi2, but by imx-media delving
around in the imx219 subdevs.

>From what I can see, smiapp does the same thing that I do in imx219 -
sets the subdev->dev member to point at the struct device, which then
means that v4l2_device_register_subdev() will associate the same fwnode
with both "imx219 pixel 0-0010" and "imx219 0-0010".

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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