linux-kernel - Re: [PATCH 1/5] dt-bindings: dma: ti: k3-bcdma: Add bindings for BCDMA CSI RX

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Message-ID: <cd6e259f-4216-17c2-fab0-a952c0177fee@linaro.org>
Date:   Wed, 7 Dec 2022 09:03:36 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Vignesh Raghavendra <vigneshr@...com>,
        Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] dt-bindings: dma: ti: k3-bcdma: Add bindings for
 BCDMA CSI RX

On 07/12/2022 07:09, Vignesh Raghavendra wrote:
> Hi Krzysztof,
> 
> On 06/12/22 14:02, Krzysztof Kozlowski wrote:
>> On 06/12/2022 05:35, Vignesh Raghavendra wrote:
>>> AM62A SoC has a dedicated BCDMA that serves Camera Serial Interface
>>> (CSI) IP. Add new compatible for the same. Unlike system
>>> BCDMA, this instance only has RX DMA channels and lack TX or block copy
>>> channel. Thus make those properties optional. Additionally CSI RX has
>>> independent power domain, add the binding for the same.
>>>
>>> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
>>> ---
>>>  .../devicetree/bindings/dma/ti/k3-bcdma.yaml  | 87 ++++++++++++++-----
>>>  1 file changed, 63 insertions(+), 24 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/dma/ti/k3-bcdma.yaml b/Documentation/devicetree/bindings/dma/ti/k3-bcdma.yaml
>>> index 08627d91e607..d7b5adbb9b2e 100644
>>> --- a/Documentation/devicetree/bindings/dma/ti/k3-bcdma.yaml
>>> +++ b/Documentation/devicetree/bindings/dma/ti/k3-bcdma.yaml
>>> @@ -32,9 +32,66 @@ allOf:
>>>    - $ref: /schemas/dma/dma-controller.yaml#
>>>    - $ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#
>>>  
>>
>> When adding if:then:, please move entire allOf after "required:" part.
> 
> Sure, will do
> 
>>
>>> +  - if:
>>> +      properties:
>>> +        compatible:
>>> +          contains:
>>> +            const: ti,am62a-dmss-bcdma-csirx
>>> +    then:
>>> +      properties:
>>> +        ti,sci-rm-range-bchan: false
>>> +        ti,sci-rm-range-tchan: false
>>> +
>>> +        reg:
>>> +          maxItems: 3
>>> +
>>> +        reg-names:
>>> +          items:
>>> +            - const: gcfg
>>> +            - const: rchanrt
>>> +            - const: ringrt
>>
>> With my changes further this can be only "maxItems: 3"
> 
> Yes, but wont that mean any of the 3 reg-names out of the 5? Would it
> not be better to further restrict specifically to above 3 reg-names (as
> thats how the IP is)

I thought that first three entries are the same, but they are not, so
indeed keep it like you have it now.

> 
>>
>>> +
>>> +      required:
>>> +        - compatible
>>> +        - "#dma-cells"
>>> +        - reg
>>> +        - reg-names
>>> +        - msi-parent
>>> +        - ti,sci
>>> +        - ti,sci-dev-id
>>> +        - ti,sci-rm-range-rchan
>>> +        - power-domains
>>> +
>>> +    else:
>>> +      properties:
>>> +        reg:
>>> +          maxItems: 5
>>> +
>>> +        reg-names:
>>> +          items:
>>> +            - const: gcfg
>>> +            - const: bchanrt
>>> +            - const: rchanrt
>>> +            - const: tchanrt
>>> +            - const: ringrt
>>
>> With my changes further this can be only "minItems: 5"
> 
> Ok.

I was wrong, keep it.

> 
>>
>>> +
>>> +      required:
>>> +        - compatible
>>> +        - "#dma-cells"
>>> +        - reg
>>> +        - reg-names
>>> +        - msi-parent
>>> +        - ti,sci
>>> +        - ti,sci-dev-id
>>> +        - ti,sci-rm-range-bchan
>>> +        - ti,sci-rm-range-tchan
>>> +        - ti,sci-rm-range-rchan
>>> +
>>>  properties:
>>>    compatible:
>>> -    const: ti,am64-dmss-bcdma
>>> +    enum:
>>> +      - ti,am64-dmss-bcdma
>>> +      - ti,am62a-dmss-bcdma-csirx
>>
>> Keep some order, e.g. alphabetical. This reduces later conflicts on
>> simultaneous edits.
> 
> Will fix!
> 
>>
>>>  
>>>    "#dma-cells":
>>>      const: 3
>>> @@ -65,19 +122,13 @@ properties:
>>>  
>>>        cell 3: ASEL value for the channel
>>>  
>>> -  reg:
>>> -    maxItems: 5
>>
>> Keep it here with widest constrains - minItems: 3, maxItems: 5
>>
>>> -
>>> -  reg-names:
>>> -    items:
>>> -      - const: gcfg
>>> -      - const: bchanrt
>>> -      - const: rchanrt
>>> -      - const: tchanrt
>>> -      - const: ringrt
>>
>> Keep the list here with minItems: 3

So here minItems:3, maxItems:5


Best regards,
Krzysztof