linux-kernel - Re: [PATCH v6 1/4] dt-bindings: misc: qcom,fastrpc: Add compatible for Kaanapali

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Message-ID: <b3d2c54d-f2ea-420a-b7f3-b9e60a96a841@oss.qualcomm.com>
Date: Mon, 22 Dec 2025 14:38:28 +0530
From: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
To: Rob Herring <robh@...nel.org>
Cc: kpallavi@....qualcomm.com, srini@...nel.org, amahesh@....qualcomm.com,
        arnd@...db.de, gregkh@...uxfoundation.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, quic_bkumar@...cinc.com,
        ekansh.gupta@....qualcomm.com, linux-kernel@...r.kernel.org,
        quic_chennak@...cinc.com, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        jingyi.wang@....qualcomm.com, aiqun.yu@....qualcomm.com,
        ktadakam@....qualcomm.com
Subject: Re: [PATCH v6 1/4] dt-bindings: misc: qcom,fastrpc: Add compatible
 for Kaanapali



On 12/11/2025 9:11 PM, Rob Herring wrote:
> On Thu, Dec 11, 2025 at 03:39:30PM +0530, Kumari Pallavi wrote:
>> Kaanapali introduces changes in DSP IOVA layout and CDSP DMA addressing
>> that differ from previous SoCs. The SID field moves within the physical
>> address, and CDSP now supports a wider DMA range, requiring updated
>> sid_pos and DMA mask handling in the driver.
>>
>> Signed-off-by: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
>> ---
>>   Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml | 7 ++++++-
>>   1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
>> index 3f6199fc9ae6..142309e2c656 100644
>> --- a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
>> +++ b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
>> @@ -18,7 +18,12 @@ description: |
>>   
>>   properties:
>>     compatible:
>> -    const: qcom,fastrpc
>> +    oneOf:
>> +      - items:
>> +          - enum:
>> +              - qcom,kaanapali-fastrpc
>> +          - const: qcom,fastrpc
> 
> Does the driver work at all on this platform without the changes in this
> series? If not, then it is not compatible with "qcom,fastrpc" as you
> say here.
> 

Thanks for the clarification
No, it doesn't work on kaanapali without this patch series
I have updated the bindings accordingly to allow
either "qcom,kaanapali-fastrpc" for Kaanapali or "qcom,fastrpc"
for older platforms

properties:
   compatible:
     enum:
       - qcom,kaanapali-fastrpc
       - qcom,fastrpc

Regards,
Pallavi

> Rob