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 13:38:41 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Kuldeep Singh <singh.kuldeep87k@...il.com>
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

On 11/04/2022 12:58, Kuldeep Singh wrote:
>> 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.

Yes, I know. This does not solve my wonder.

> 
>>
>>> +
>>> +  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.

type:boolean is just shorter and example-schema recommends it. If you
want to base on something (as a template, pattern) then the
example-schema is the source, the preferred one.

>>> +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.

These are required, so the SoC DTSI should be fixed. Not with random
clocks but something proper. :)

Best regards,
Krzysztof