linux-kernel - Re: [PATCH 2/6] dt-bindings: dma: qcom,bam: Document dma-coherent property

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Message-ID: <49186309-72f5-faa5-bcae-739c6b5e7d30@quicinc.com>
Date: Thu, 27 Mar 2025 16:16:42 +0530
From: Kaushal Kumar <quic_kaushalk@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, <vkoul@...nel.org>,
        <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <manivannan.sadhasivam@...aro.org>, <miquel.raynal@...tlin.com>,
        <richard@....at>, <vigneshr@...com>, <andersson@...nel.org>,
        <konradybcio@...nel.org>, <agross@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH 2/6] dt-bindings: dma: qcom,bam: Document dma-coherent
 property

On 3/13/2025 8:20 PM, Krzysztof Kozlowski wrote:
> On 13/03/2025 14:09, Kaushal Kumar wrote:
>> SDX75 BAM DMA controller has DMA-coherent support so define
>> it in the properties section, without which 'dtbs_check'
>> reports the following error:
>>
>>    controller@...c000: 'dma-coherent' does not match any of the
>>    regexes: 'pinctrl-[0-9]+'
> How can I reproduce it?
It is not an existing error. It is the error that would come unless the 
new property is defined. Will remove this part of commit text in v2.
> Fixes tag?
>
>> Signed-off-by: Kaushal Kumar <quic_kaushalk@...cinc.com>
>> ---
>>   Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml b/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml
>> index 3ad0d9b1fbc5..c4dd6a503964 100644
>> --- a/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml
>> +++ b/Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml
>> @@ -39,6 +39,8 @@ properties:
>>     "#dma-cells":
>>       const: 1
>>   
>> +  dma-coherent: true
>> +
> Which devices are DMA coherent?
Will update it under a bam version check in v2.
>
>
> Best regards,
> Krzysztof