linux-kernel - Re: [PATCH 4/5] dt-bindings: fsl-dma: fsl-edma: add fsl,imx8ulp-edma compatible string

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Message-ID: <ZeCq5Sk+sPA9rEtI@lizhi-Precision-Tower-5810>
Date: Thu, 29 Feb 2024 11:03:49 -0500
From: Frank Li <Frank.li@....com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Peng Fan <peng.fan@....com>,
	imx@...ts.linux.dev, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Joy Zou <joy.zou@....com>
Subject: Re: [PATCH 4/5] dt-bindings: fsl-dma: fsl-edma: add fsl,imx8ulp-edma
 compatible string

On Thu, Feb 29, 2024 at 04:58:23PM +0100, Krzysztof Kozlowski wrote:
> On 29/02/2024 16:54, Frank Li wrote:
> > On Thu, Feb 29, 2024 at 10:49:43AM +0100, Krzysztof Kozlowski wrote:
> >> On 27/02/2024 18:21, Frank Li wrote:
> >>>  
> >>> +  - if:
> >>> +      properties:
> >>> +        compatible:
> >>> +          contains:
> >>> +            const: fsl,imx8ulp-edma
> >>> +    then:
> >>> +      properties:
> >>> +        clock:
> >>> +          maxItems: 33
> >>> +        clock-names:
> >>> +          items:
> >>> +            - const: dma
> >>> +            - pattern: "^CH[0-31]-clk$"
> >>> +        interrupt-names: false
> >>> +        interrupts:
> >>> +          maxItems: 32
> >>> +        "#dma-cells":
> >>> +          const: 3
> >>
> >> Why suddenly fsl,vf610-edma can have from 2 to 33 clocks? Constrain
> >> properly the variants.
> > 
> > Suppose you talk about 'fsl,imx8ulp-edma' instead 'fsl,vf610-edma'.
> > 
> > imx8ulp each channel have one clk, there are 32 channel. 1 channel for core
> > controller. So max became 32.
> > 
> > I can add above information in commit message.
> 
> No, I meant Vybrid. Quick look at this code and the actual file suggest
> that you allow vybrid with 30-whatever clocks. Test it.

Any tools or good method to find it? 

Frank

> 
> Best regards,
> Krzysztof
>