[PATCH 1/2] dt-bindings: firmware: arm,scmi: Document arm,poll-transport property

[Marek Vasut]

On 10/23/25 3:07 PM, Geert Uytterhoeven wrote:
> Hi Marek,

Hello Geert,

> On Thu, 23 Oct 2025 at 14:37, Marek Vasut
> <marek.vasut+renesas at mailbox.org> wrote:
>> Document new property arm,poll-transport, which sets all SCMI operation into
>> poll mode. This is meant to work around uncooperative SCP implementations,
>> which do not generate completion interrupts. This applies primarily on mbox
>> based implementations, but does also cover SMC and VirtIO ones.
>>
>> With this property set, such implementations which do not generate interrupts
>> can be interacted with, until they are fixed to generate interrupts properly.
>>
>> Note that, because the original base protocol exchange also requires some
>> sort of completion mechanism, it is not possible to query SCMI itself for
>> this property and it must be described in DT. While this does look a bit
>> like policy, the SCMI provider is part of the hardware, hence DT.
>>
>> Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
> 
> Thanks for your patch!
> 
>> --- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
>> +++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
>> @@ -146,6 +146,13 @@ properties:
>>         this platform. If set, the value should be non-zero.
>>       minimum: 1
>>
>> +  arm,poll-transport:
>> +    type: boolean
>> +    description:
>> +      An optional property which unconditionally forces polling in all transports.
>> +      This is mainly mean to work around uncooperative SCP, which does not generate
> 
> meant
Fixed locally for potential V2, thanks.