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

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Date: Sat, 2 Mar 2024 17:43:01 +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 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?

Best regards,
Krzysztof