linux-kernel - Re: [RFC PATCH v3 0/9] Add functionality to ipu3-cio2 driver allowing software_node connections to sensors on platforms designed for Windows

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Date:   Tue, 20 Oct 2020 12:24:33 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Daniel Scally <djrscally@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux.walleij@...aro.org, prabhakar.mahadev-lad.rj@...renesas.com,
        heikki.krogerus@...ux.intel.com, dmitry.torokhov@...il.com,
        laurent.pinchart+renesas@...asonboard.com,
        kieran.bingham+renesas@...asonboard.com, jacopo+renesas@...ndi.org,
        robh@...nel.org, davem@...emloft.net, linux@...musvillemoes.dk,
        sergey.senozhatsky@...il.com, rostedt@...dmis.org,
        pmladek@...e.com, mchehab@...nel.org, tian.shu.qiu@...el.com,
        bingbu.cao@...el.com, sakari.ailus@...ux.intel.com,
        yong.zhi@...el.com, rafael@...nel.org, gregkh@...uxfoundation.org,
        kitakar@...il.com, dan.carpenter@...cle.org
Subject: Re: [RFC PATCH v3 0/9] Add functionality to ipu3-cio2 driver
 allowing software_node connections to sensors on platforms designed for
 Windows

On Mon, Oct 19, 2020 at 11:58:54PM +0100, Daniel Scally wrote:
> Hello all
> 
> This series adds support to the ipu3-cio2 driver for fwnode connections
> between cio2 and sensors to be defined via software_nodes. The final patch
> in the series deals wholly with those changes - the preceding patches are
> either supporting changes to accommodate that or incidental fixes along
> the way:
> 
> 1/9 adds a function to drivers/base/swnode.c unwinding arrays of software
> nodes in reverse order
> 
> 2/9 uses that function in lib/test_printf.c
> 
> 3/9 fixes what seems to me to be a bug in the existing swnode.c code in
> that software_node_get_next_child() does not increase the refcount of the
> returned node (in contrast to, for example, of_get_next_child_node() which
> does increase the count)
> 
> 4/9 adds the fwnode_graph*() family of functions to the software_node
> implementation
> 
> 5/9 adds a T: entry to MAINTAINERS for the ipu3-cio2 driver
> 
> 6/9 renames the ipu3-cio2.c file to ipu3-cio2-main.c and fixes Makefile
> to accommodate that change
> 
> 7/9 alters the ipu3-cio2 driver to check if the pci_dev's fwnode is a
> software_node and pass flags to fwnode_graph_get_endpoint_by_id() if so
> 
> 8/9 alters match_fwnode() in v4l2-async.c to additionally try to match on
> a fwnode_handle's secondary if the primary doesn't match
> 
> 9/9 alters the ipu3-cio2 driver to do the actual building of software_node
> connections between the sensor devices and the cio2 device.

Thanks!
I have mostly cosmetic comments.

> This is still not ready for integration - hence the RFC label - as there
> is ongoing work to extend the ipu3-cio2 driver further to parse ACPI
> to discover resources such as regulators and GPIOs that are defined there
> in unusual ways and map them to the sensor devices so that their drivers
> can consume them transparently through the usual frameworks. Given this
> has changed quite extensively from v2 though, I wanted to submit it for
> feedback at this point in case it needs further large scale change.

>From my point of view it's a good start to drop RFC from next version
(RFC v3 -> v1). But let's wait couple of weeks for people to comment (now is a
second week of merge window, not everybody looking into the mailing lists).

> Daniel Scally (8):
>   software_node: Add helper function to unregister arrays of
>     software_nodes ordered parent to child
>   lib/test_printf.c: Use helper function to unwind array of
>     software_nodes
>   software_node: Fix failure to hold refcount in
>     software_node_get_next_child
>   ipu3-cio2: Add T: entry to MAINTAINERS
>   ipu3-cio2: Rename ipu3-cio2.c to allow module to be built from
>     multiple sources files retaining ipu3-cio2 name
>   ipu3-cio2: Check if pci_dev->dev's fwnode is a software_node in
>     cio2_parse_firmware() and set FWNODE_GRAPH_DEVICE_DISABLED if so
>   media: v4l2-core: v4l2-async: Check possible match in match_fwnode
>     based on sd->fwnode->secondary
>   ipu3-cio2: Add functionality allowing software_node connections to
>     sensors on platforms designed for Windows
> 
> Heikki Krogerus (1):
>   software_node: Add support for fwnode_graph*() family of functions
> 
>  MAINTAINERS                                   |   2 +
>  drivers/base/swnode.c                         | 143 +++++++-
>  drivers/media/pci/intel/ipu3/Kconfig          |  18 +
>  drivers/media/pci/intel/ipu3/Makefile         |   3 +
>  drivers/media/pci/intel/ipu3/cio2-bridge.c    | 327 ++++++++++++++++++
>  drivers/media/pci/intel/ipu3/cio2-bridge.h    |  94 +++++
>  .../ipu3/{ipu3-cio2.c => ipu3-cio2-main.c}    |  30 +-
>  drivers/media/pci/intel/ipu3/ipu3-cio2.h      |   9 +
>  drivers/media/v4l2-core/v4l2-async.c          |   8 +
>  include/linux/property.h                      |   1 +
>  lib/test_printf.c                             |   4 +-
>  11 files changed, 632 insertions(+), 7 deletions(-)
>  create mode 100644 drivers/media/pci/intel/ipu3/cio2-bridge.c
>  create mode 100644 drivers/media/pci/intel/ipu3/cio2-bridge.h
>  rename drivers/media/pci/intel/ipu3/{ipu3-cio2.c => ipu3-cio2-main.c} (98%)
> 
> -- 
> 2.17.1
> 

-- 
With Best Regards,
Andy Shevchenko