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

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Message-ID: <ZeNWXxzFBzNj0gM1@lizhi-Precision-Tower-5810>
Date: Sat, 2 Mar 2024 11:39:59 -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 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.

Frank
> 
> Best regards,
> Krzysztof
>