linux-kernel - RE: [EXT] Re: [PATCH v4 2/2] dt-bindings: media: imx-jpeg: Assign slot for imx jpeg encoder/decoder

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Date:   Wed, 27 Sep 2023 09:10:52 +0000
From:   Ming Qian <ming.qian@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "Mirela Rabulea (OSS)" <mirela.rabulea@....nxp.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>
CC:     "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "X.H. Bao" <xiahong.bao@....com>, Eagle Zhou <eagle.zhou@....com>,
        Tao Jiang <tao.jiang_2@....com>,
        dl-linux-imx <linux-imx@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [EXT] Re: [PATCH v4 2/2] dt-bindings: media: imx-jpeg: Assign
 slot for imx jpeg encoder/decoder

>From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>Sent: 2023年9月27日 16:06
>To: Ming Qian <ming.qian@....com>; Mirela Rabulea (OSS)
><mirela.rabulea@....nxp.com>; robh+dt@...nel.org; shawnguo@...nel.org
>Cc: krzysztof.kozlowski+dt@...aro.org; conor+dt@...nel.org;
>mchehab@...nel.org; hverkuil-cisco@...all.nl; s.hauer@...gutronix.de;
>kernel@...gutronix.de; festevam@...il.com; X.H. Bao
><xiahong.bao@....com>; Eagle Zhou <eagle.zhou@....com>; Tao Jiang
><tao.jiang_2@....com>; dl-linux-imx <linux-imx@....com>;
>devicetree@...r.kernel.org; linux-media@...r.kernel.org; linux-
>kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
>Subject: [EXT] Re: [PATCH v4 2/2] dt-bindings: media: imx-jpeg: Assign slot for
>imx jpeg encoder/decoder
>
>Caution: This is an external email. Please take care when clicking links or
>opening attachments. When in doubt, report the message using the 'Report
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>
>
>On 26/09/2023 12:10, Ming Qian wrote:
>> There are total 4 slots available in the IP, and we only need to use
>> one slot in one os, assign a single slot, configure interrupt and
>> power domain only for 1 slot, not for the all 4 slots.
>>
>> Signed-off-by: Ming Qian <ming.qian@....com>
>> ---
>> v4
>> - improve commit message
>> - don't make an ABI break
>> v3
>> - add vender prefix, change property slot to nxp,slot
>> - add type for property slot
>>
>>  .../bindings/media/nxp,imx8-jpeg.yaml         | 45 +++++++++----------
>>  1 file changed, 21 insertions(+), 24 deletions(-)
>>
>> diff --git
>> a/Documentation/devicetree/bindings/media/nxp,imx8-jpeg.yaml
>> b/Documentation/devicetree/bindings/media/nxp,imx8-jpeg.yaml
>> index 3d9d1db37040..4bcfc815c894 100644
>> --- a/Documentation/devicetree/bindings/media/nxp,imx8-jpeg.yaml
>> +++ b/Documentation/devicetree/bindings/media/nxp,imx8-jpeg.yaml
>> @@ -32,19 +32,26 @@ properties:
>>      maxItems: 1
>>
>>    interrupts:
>> -    description: |
>> -      There are 4 slots available in the IP, which the driver may use
>> -      If a certain slot is used, it should have an associated interrupt
>> -      The interrupt with index i is assumed to be for slot i
>> -    minItems: 1               # At least one slot is needed by the driver
>> -    maxItems: 4               # The IP has 4 slots available for use
>> +    description:
>> +      Interrupt number for slot
>> +    maxItems: 1
>>
>>    power-domains:
>>      description:
>>        List of phandle and PM domain specifier as documented in
>>        Documentation/devicetree/bindings/power/power_domain.txt
>> -    minItems: 2               # Wrapper and 1 slot
>> -    maxItems: 5               # Wrapper and 4 slots
>> +    minItems: 1               # VPUMIX
>> +    maxItems: 2               # Wrapper and 1 slot
>> +
>> +  nxp,slot:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    description:
>> +      Integer number of slot index used. There are 4 slots available in the IP,
>> +      and driver can use a certain slot, it should have an associated interrupt
>> +      and power-domain. In theory, it supports 4 os or vm. If not specified, 0
>> +      is used by default.
>> +    minimum: 0
>> +    maximum: 3
>
>NAK, you still did not answer concerns why this is needed and justified.
>I keep asking and you keep ignoring...
>
>Best regards,
>Krzysztof

Hi Krzysztof,

> Nothing explains what is a slot and nothing explains why do you need this property.

I thought I had answered that question, but seems you don't agree with that explanation. 
Would the following description be any better?

The slot is the IP used to share the jpeg engine across multiple VMS and os, there are 4 slots available in the IP. We can use one slot in linux. The slot index indicates which slot we choose. If not specified, 0 is used by default.