linux-kernel - Re: [PATCH 1/2] dt-bindings: misc: qcom,fastrpc: add qcom,assign-all-memory property

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Date:   Mon, 27 Mar 2023 14:22:19 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Dylan Van Assche <me@...anvanassche.be>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Amol Maheshwari <amahesh@....qualcomm.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: misc: qcom,fastrpc: add
 qcom,assign-all-memory property

On 27/03/2023 13:37, Dylan Van Assche wrote:
> Hi Krzysztof,
> 
> On Sun, 2023-03-26 at 10:55 +0200, Krzysztof Kozlowski wrote:
>> On 25/03/2023 14:44, Dylan Van Assche wrote:
>>> Document the added qcom,assign-all-memory in devicetree bindings.
>>>
>>> Signed-off-by: Dylan Van Assche <me@...anvanassche.be>
>>> ---
>>>  Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml | 6
>>> ++++++
>>>  1 file changed, 6 insertions(+)
>>>
>>> diff --git
>>> a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
>>> b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
>>> index 1ab9588cdd89..fa5b00534b30 100644
>>> --- a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
>>> +++ b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
>>> @@ -57,6 +57,12 @@ properties:
>>>        Virtual machine IDs for remote processor.
>>>      $ref: "/schemas/types.yaml#/definitions/uint32-array"
>>>  
>>> +  qcom,assign-all-mem:
>>> +    description:
>>> +      Assign memory to all Virtual machines defined by qcom,vmids.
>>
>> This (neither commit msg) does not explain why this is needed and
>> actually does not sound like hardware-related property.
> 
> This is made a separate property to toggle different behavior in the
> driver if it is needed for some FastRPC nodes. 

Bindings are not for driver behavior.

> Downstream does guard
> this with a property 'restrict-access' as well, see [1] for a random
> SDM845 downstream kernel. On SDM845, this property is not present, thus
> the IF block runs. On SDM670, this property is present, then the IF
> block is skipped. That's why I opt for this property to have this
> behaviour conditionally. I'm not sure how to explain it better though.

Still you described driver... Please come with something more hardware
related.

Best regards,
Krzysztof