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

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Date:   Fri, 20 May 2022 12:02:42 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     yuji2.ishikawa@...hiba.co.jp, robh+dt@...nel.org,
        nobuhiro1.iwamatsu@...hiba.co.jp, sumit.semwal@...aro.org,
        christian.koenig@....com
Cc:     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 0/4] Add Toshiba Visconti DNN image processing accelerator
 driver

Hi Yuji,

On 5/20/22 11:48, yuji2.ishikawa@...hiba.co.jp wrote:
> Hi Hans,
> 
> Thank you for your comment.
> I agree that this submission lacks documents sharing basic idea of the accelerators; what do they accept and what do they yield.
> Where can I put a new document? Can I put it as a comment in a source? Can I add a file under Documentation/misc-devices directory?

Start with explaining it by replying to this mail. Without knowing anything
about the hardware, it is difficult to say what the best place is. Usually
it is either the public API header, or somewhere in Documentation.

The first step is to have a better understanding of the Visconti image hardware
and to see what the best subsystem would be to support that hardware.

Regards,

	Hans

> 
> Thanks,
> Yuji Ishikawa
> 
>> -----Original Message-----
>> From: Hans Verkuil <hverkuil@...all.nl>
>> Sent: Thursday, May 12, 2022 8:15 PM
>> To: ishikawa yuji(石川 悠司 ○ＲＤＣ□ＡＩＴＣ○ＥＡ開)
>> <yuji2.ishikawa@...hiba.co.jp>; Rob Herring <robh+dt@...nel.org>;
>> iwamatsu nobuhiro(岩松 信洋 □ＳＷＣ◯ＡＣＴ)
>> <nobuhiro1.iwamatsu@...hiba.co.jp>; Sumit Semwal
>> <sumit.semwal@...aro.org>; Christian König <christian.koenig@....com>
>> Cc: 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 0/4] Add Toshiba Visconti DNN image processing
>> accelerator driver
>>
>> Hi Yuji,
>>
>> On 4/28/22 15:11, Yuji Ishikawa wrote:
>>> This series is the DNN 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"
>>> and the fourth patch "MAINTAINERS: ..." are the same as the ones in the
>> preceding post for affine driver.
>>
>> There appears to be no documentation whatsoever, unless I am missing
>> something.
>>
>> How is the uAPI supposed to be used? What does it do? What formats does it
>> accept or produce?
>>
>> If this processes images, then (as Laurent mentioned) this is more suitable as a
>> V4L2 mem2mem driver.
>>
>> See
>> https://linuxtv.org/downloads/v4l-dvb-apis-new/userspace-api/v4l/dev-me
>> m2mem.html
>> and the many drivers in drivers/media that use it (git grep v4l2-mem2mem.h).
>>
>> But without any explanation whatsoever I have no idea what does or does not
>> make sense.
>>
>> Regards,
>>
>> 	Hans
>>
>>>
>>> Best regards,
>>> Yuji
>>>
>>> [0]:
>>>
>> https://toshiba.semicon-storage.com/ap-en/semiconductor/product/image-
>>> recognition-processors-visconti.html
>>>
>>> Yuji Ishikawa (4):
>>>   dt-bindings: soc: visconti: Add Toshiba Visconti DNN image processing
>>>     accelerator bindings
>>>   soc: visconti: Add Toshiba Visconti image processing accelerator
>>>     common source
>>>   soc: visconti: Add Toshiba Visconti DNN image processing accelerator
>>>   MAINTAINERS: Add entries for Toshiba Visconti DNN image processing
>>>     accelerator
>>>
>>>  .../soc/visconti/toshiba,visconti-dnn.yaml    |  54 ++
>>>  MAINTAINERS                                   |   2 +
>>>  drivers/soc/Kconfig                           |   1 +
>>>  drivers/soc/Makefile                          |   1 +
>>>  drivers/soc/visconti/Kconfig                  |   7 +
>>>  drivers/soc/visconti/Makefile                 |   8 +
>>>  drivers/soc/visconti/dnn/Makefile             |   6 +
>>>  drivers/soc/visconti/dnn/dnn.c                | 533
>> ++++++++++++++++++
>>>  drivers/soc/visconti/dnn/hwd_dnn.c            | 183 ++++++
>>>  drivers/soc/visconti/dnn/hwd_dnn.h            |  68 +++
>>>  drivers/soc/visconti/dnn/hwd_dnn_reg.h        | 228 ++++++++
>>>  drivers/soc/visconti/ipa_common.c             |  55 ++
>>>  drivers/soc/visconti/ipa_common.h             |  18 +
>>>  drivers/soc/visconti/uapi/dnn.h               |  77 +++
>>>  drivers/soc/visconti/uapi/ipa.h               |  88 +++
>>>  15 files changed, 1329 insertions(+)
>>>  create mode 100644
>>> Documentation/devicetree/bindings/soc/visconti/toshiba,visconti-dnn.ya
>>> ml  create mode 100644 drivers/soc/visconti/Kconfig  create mode
>>> 100644 drivers/soc/visconti/Makefile  create mode 100644
>>> drivers/soc/visconti/dnn/Makefile  create mode 100644
>>> drivers/soc/visconti/dnn/dnn.c  create mode 100644
>>> drivers/soc/visconti/dnn/hwd_dnn.c
>>>  create mode 100644 drivers/soc/visconti/dnn/hwd_dnn.h
>>>  create mode 100644 drivers/soc/visconti/dnn/hwd_dnn_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/dnn.h  create mode 100644
>>> drivers/soc/visconti/uapi/ipa.h
>>>