linux-kernel - Re: [PATCH v2 6/6] dt-bindings: dma: Convert Qualcomm BAM DMA binding to json format

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Date:   Mon, 11 Apr 2022 16:28:10 +0530
From:   Kuldeep Singh <singh.kuldeep87k@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dmaengine@...r.kernel.org
Subject: Re: [PATCH v2 6/6] dt-bindings: dma: Convert Qualcomm BAM DMA
 binding to json format

> This is something new and it seems only one SoC defines it (not even one
> BAM version). I wonder whether this is actually correct or this
> particular version of BAM is slightly different. Maybe someone could
> clarify it, but if no - looks ok.

Yes, sdm845.dtsi uses 4 entries and rest 1.

> 
> > +
> > +  num-channels:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description:
> > +      Indicates supported number of DMA channels in a remotely controlled bam.
> > +
> > +  qcom,controlled-remotely:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> 
> type: boolean

Boolean comes under flag in types.yaml

definitions:
  flag:
    oneOf:
      - type: boolean
        const: true
      - type: 'null'

I have seen other boolean properties(spi-cpol, spi-cpha and bunch of
others) using type flag. I think we should keep flag here.

> 
> > +    description:
> > +      Indicates that the bam is controlled by remote proccessor i.e. execution
> > +      environment.
> > +
> > +  qcom,ee:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description:
> > +      Indicates the active Execution Environment identifier (0-7) used in the
> > +      secure world.
> 
> maximum: 7

ok.

> > +required:
> > +  - compatible
> > +  - "#dma-cells"
> > +  - interrupts
> > +  - reg
> 
> clocks, clock-names, qcom-ee - these are required according to old bindings.

I missed qcom,ee. Will add in v3.

For clocks and clock-names , there are two platforms(msm8996.dtsi,
sdm845.dtsi) where these properties are missing. And I don't want to add
some random values. Shall I skip them here? and let board owners add
them later.