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

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Date: Sun, 3 Mar 2024 22:26:09 -0500
From: Frank Li <Frank.li@....com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
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 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
and imx93. If add power-domains at existed example, it will mislead reader.

Frank
> 
> Best regards,
> Krzysztof
>