linux-kernel - Re: [PATCH v2 0/4] Add Toshiba Visconti AFFINE image processing accelerator driver

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Date:   Thu, 28 Apr 2022 01:03:52 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Yuji Ishikawa <yuji2.ishikawa@...hiba.co.jp>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v2 0/4] Add Toshiba Visconti AFFINE image processing
 accelerator driver

Hi Yuji,

Thank you for the patch. It's nice to see contributions from Toshiba in
the image acceleration domain :-)

I'll start with a high-level question before diving into detailed
review. Why is this implemented in drivers/soc/ with a custom userspace
API, and not as a V4L2 memory-to-memory driver ?

On Wed, Apr 27, 2022 at 10:23:41PM +0900, Yuji Ishikawa wrote:
> This series is the AFFINE image processing accelerator driver for Toshiba's ARM SoC, Visconti[0].
> This provides DT binding documentation, device driver, MAINTAINER files.
> 
> The second patch "soc: visconti: Add Toshiba Visconti image processing accelerator common source"
> is commonly used among acclerator drivers (affine, dnn, dspif, pyramid).
> 
> Best regards,
> Yuji
> 
> [0]: https://toshiba.semicon-storage.com/ap-en/semiconductor/product/image-recognition-processors-visconti.html
>   
>   dt-bindings: soc: visconti: Add Toshiba Visconti AFFINE image
>     v1 -> v2:
>       - No update
> 
>   soc: visconti: Add Toshiba Visconti image processing accelerator common source
>     v1 -> v2:
>       - apply checkpatch.pl --strict
>   
>   soc: visconti: Add Toshiba Visconti AFFINE image processing accelerator
>     v1 -> v2:
>       - apply checkpatch.pl --strict
>       - rename hwd_AFFINE_xxxx to hwd_affine_xxxx
> 
>   MAINTAINERS: Add entries for Toshiba Visconti AFFINE image processing accelerator
>     v1 -> v2:
>       - No update
> 
> Change in V2:
>   - apply checkpatch.pl --strict
>   - rename hwd_AFFINE_xxxx to hwd_affine_xxxx
> 
> Yuji Ishikawa (4):
>   dt-bindings: soc: visconti: Add Toshiba Visconti AFFINE image
>     processing accelerator bindings
>   soc: visconti: Add Toshiba Visconti image processing accelerator
>     common source
>   soc: visconti: Add Toshiba Visconti AFFINE image processing
>     accelerator
>   MAINTAINERS: Add entries for Toshiba Visconti AFFINE image processing
>     accelerator
> 
>  .../soc/visconti/toshiba,visconti-affine.yaml |  53 ++
>  MAINTAINERS                                   |   2 +
>  drivers/soc/Kconfig                           |   1 +
>  drivers/soc/Makefile                          |   1 +
>  drivers/soc/visconti/Kconfig                  |   7 +
>  drivers/soc/visconti/Makefile                 |   8 +
>  drivers/soc/visconti/affine/Makefile          |   6 +
>  drivers/soc/visconti/affine/affine.c          | 451 ++++++++++++++++++
>  drivers/soc/visconti/affine/hwd_affine.c      | 206 ++++++++
>  drivers/soc/visconti/affine/hwd_affine.h      |  83 ++++
>  drivers/soc/visconti/affine/hwd_affine_reg.h  |  45 ++
>  drivers/soc/visconti/ipa_common.c             |  55 +++
>  drivers/soc/visconti/ipa_common.h             |  18 +
>  drivers/soc/visconti/uapi/affine.h            |  87 ++++
>  drivers/soc/visconti/uapi/ipa.h               |  88 ++++
>  15 files changed, 1111 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/visconti/toshiba,visconti-affine.yaml
>  create mode 100644 drivers/soc/visconti/Kconfig
>  create mode 100644 drivers/soc/visconti/Makefile
>  create mode 100644 drivers/soc/visconti/affine/Makefile
>  create mode 100644 drivers/soc/visconti/affine/affine.c
>  create mode 100644 drivers/soc/visconti/affine/hwd_affine.c
>  create mode 100644 drivers/soc/visconti/affine/hwd_affine.h
>  create mode 100644 drivers/soc/visconti/affine/hwd_affine_reg.h
>  create mode 100644 drivers/soc/visconti/ipa_common.c
>  create mode 100644 drivers/soc/visconti/ipa_common.h
>  create mode 100644 drivers/soc/visconti/uapi/affine.h
>  create mode 100644 drivers/soc/visconti/uapi/ipa.h

-- 
Regards,

Laurent Pinchart