Re: [PATCH v8 1/4] dt-bindings: i2c: qcom,i2c-geni: Document multi-owner controller support

On 7/16/2026 8:44 AM, Bjorn Andersson wrote:
[...]

>> --- a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml
>> +++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml
>> @@ -60,6 +60,22 @@ properties:
>>     power-domains:
>>       maxItems: 1
>>   
>> +  qcom,qup-multi-owner:
>> +    type: boolean
>> +    description:
>> +      Indicates that the QUP-based controller is shared with one or more
>> +      other system processors and must not be assumed to have exclusive
>> +      ownership by the operating system.
>> +
>> +      The associated GPIOs must not be reconfigured into a sleep state
>> +      during runtime suspend, as doing so may disrupt transactions
>> +      initiated by another owner of the controller.
> 
> I think this should be made even clearer that this defined a requirement
> on the operating system. I also think that "sleep state" is a misnomer,
> it's not the sleep state as such that is the problem (what happens if I
> define a sleep state with functional settings, or what happens if I
> define an "idle" state?)
Agree, only mentioning of sleep state may misguide. Rather, will make it 
reverse, what you have pointed below.
> 
> One way to handle this would be to declare that only "default" state is
> allowed, when this property is specified.
> 
> If we still want this, I think it should be rephrased something like:
> 
> """
> When this option is present the Operating System must ignore any
> non-default pinctrl state configuration, as reconfiguring the associated
> pins might disrupt transactions initiated by another owner of the
> controller.
> """
> 
Thanks for clarity ! Will update in next patch. Let me finalize Patch 2 
with alignment to DMA.
> Regards,
> Bjorn
> 
>> +
>> +      Each owner is responsible for maintaining any resource votes
>> +      required for operation of the shared controller (for example clocks,
>> +      power domains, interconnect bandwidth, or other platform-specific
>> +      resources)
>> +
>>     reg:
>>       maxItems: 1
>>   
>> -- 
>> 2.43.0
>>