linux-kernel - Re: [PATCH v2 2/2] dt-bindings: dma: fsl-edma: allow 'power-domains' property

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Date: Mon, 4 Mar 2024 08:23:20 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Frank Li <Frank.li@....com>
Cc: conor+dt@...nel.org, devicetree@...r.kernel.org,
 dmaengine@...r.kernel.org, imx@...ts.linux.dev,
 krzysztof.kozlowski+dt@...aro.org, linux-kernel@...r.kernel.org,
 peng.fan@....com, robh@...nel.org, vkoul@...nel.org
Subject: Re: [PATCH v2 2/2] dt-bindings: dma: fsl-edma: allow 'power-domains'
 property

On 04/03/2024 04:26, Frank Li wrote:
> On Sun, Mar 03, 2024 at 08:55:10AM +0100, Krzysztof Kozlowski wrote:
>> On 02/03/2024 17:47, Frank Li wrote:
>>> On Sat, Mar 02, 2024 at 05:43:01PM +0100, Krzysztof Kozlowski wrote:
>>>> On 02/03/2024 17:39, Frank Li wrote:
>>>>> On Sat, Mar 02, 2024 at 05:20:42PM +0100, Krzysztof Kozlowski wrote:
>>>>>> On 02/03/2024 16:42, Frank Li wrote:
>>>>>>> On Sat, Mar 02, 2024 at 02:59:39PM +0100, Krzysztof Kozlowski wrote:
>>>>>>>> On 01/03/2024 22:45, Frank Li wrote:
>>>>>>>>> Allow 'power-domains' property because i.MX8DXL i.MX8QM and i.MX8QXP need
>>>>>>>>> it.
>>>>>>>>>
>>>>>>>>> Fixed below DTB_CHECK warning:
>>>>>>>>>   dma-controller@...f0000: Unevaluated properties are not allowed ('power-domains' was unexpected)
>>>>>>>>>
>>>>>>>>> Signed-off-by: Frank Li <Frank.Li@....com>
>>>>>>>>> ---
>>>>>>>>>
>>>>>>>>> Notes:
>>>>>>>>>     Change from v1 to v2
>>>>>>>>>     - using maxitem: 64. Each channel have one power domain. Max 64 dmachannel.
>>>>>>>>>     - add power-domains to 'required' when compatible string is fsl,imx8qm-adma
>>>>>>>>>     or fsl,imx8qm-edma
>>>>>>>>>
>>>>>>>>>  .../devicetree/bindings/dma/fsl,edma.yaml         | 15 +++++++++++++++
>>>>>>>>>  1 file changed, 15 insertions(+)
>>>>>>>>>
>>>>>>>>> diff --git a/Documentation/devicetree/bindings/dma/fsl,edma.yaml b/Documentation/devicetree/bindings/dma/fsl,edma.yaml
>>>>>>>>> index cf0aa8e6b9ec3..76c1716b8b95c 100644
>>>>>>>>> --- a/Documentation/devicetree/bindings/dma/fsl,edma.yaml
>>>>>>>>> +++ b/Documentation/devicetree/bindings/dma/fsl,edma.yaml
>>>>>>>>> @@ -59,6 +59,10 @@ properties:
>>>>>>>>>      minItems: 1
>>>>>>>>>      maxItems: 2
>>>>>>>>>  
>>>>>>>>> +  power-domains:
>>>>>>>>> +    minItems: 1
>>>>>>>>> +    maxItems: 64
>>>>>>>>
>>>>>>>> Hm, this is odd. Blocks do not belong to almost infinite number of power
>>>>>>>> domains.
>>>>>>>
>>>>>>> Sorry, what's your means? 'power-domains' belong to 'properties'. 
>>>>>>> 'maxItems' belong to 'power-domains'.It is similar with 'clocks'. what's
>>>>>>> wrong? 
>>>>>>
>>>>>> That one device belong to 64 power domains. That's just random code...
>>>>>
>>>>> Yes, each dma channel have one power domain. Total 64 dma channel. So
>>>>> there are 64 power-domains.
>>>>
>>>> OK, then how about extending the example to be complete?
>>>
>>> Let's add 8qxp example at next version.
>>
>> You have already enough of examples there and your change here claims
>> they user power domains, so why this cannot be added to existing examples?
> 
> Only imx8qxp/8qm need power-domains now. The example in yaml is vf610, 7ulp

Need? Hardware is either part of power domain or not. It's not dual-state.

> and imx93. If add power-domains at existed example, it will mislead reader.

Then please disallow the domains for other variants. You can convert
imx93 to imx95 example, because it's no different than other one. There
is little point in putting so many same examples in the binding. You are
just duplicating DTS.

Best regards,
Krzysztof