linux-kernel - Re: [PATCH v3 1/5] dt-bindings: interconnect: Update property for icc-rpm path tag

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Date:   Mon, 4 Jul 2022 15:50:41 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Georgi Djakov <djakov@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH v3 1/5] dt-bindings: interconnect: Update property for
 icc-rpm path tag

On 04/07/2022 15:07, Leo Yan wrote:
> On Mon, Jul 04, 2022 at 02:47:13PM +0200, Krzysztof Kozlowski wrote:
>> On 04/07/2022 11:30, Leo Yan wrote:
>>> To support path tag in icc-rpm driver, the "#interconnect-cells"
>>> property is updated as enumerate values: 1 or 2.  Setting to 1 means
>>> it is compatible with old DT binding that interconnect path only
>>> contains node id; if set to 2 for "#interconnect-cells" property, then
>>> the second specifier is used as a tag (e.g. vote for which buckets).
>>>
>>> Signed-off-by: Leo Yan <leo.yan@...aro.org>
>>> ---
>>>  .../devicetree/bindings/interconnect/qcom,rpm.yaml         | 7 ++++++-
>>>  1 file changed, 6 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/interconnect/qcom,rpm.yaml b/Documentation/devicetree/bindings/interconnect/qcom,rpm.yaml
>>> index 8a676fef8c1d..cdfe419e7339 100644
>>> --- a/Documentation/devicetree/bindings/interconnect/qcom,rpm.yaml
>>> +++ b/Documentation/devicetree/bindings/interconnect/qcom,rpm.yaml
>>> @@ -45,7 +45,12 @@ properties:
>>>        - qcom,sdm660-snoc
>>>  
>>>    '#interconnect-cells':
>>> -    const: 1
>>> +    description: |
>>> +      Number of interconnect specifier. Value: <1> is one cell in a
>>> +      interconnect specifier for the interconnect node id, <2> requires
>>> +      the interconnect node id and an extra path tag.
>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>
>> Ah, too fast.  No ack. This ref is also pointless and not explained in
>> commit msg.
> 
> I referred other DT binding file for adding $ref to specify property
> type [1], so it's confused why it's pointless, anyway, I can drop $ref
> in next spin.
> 
> Thanks a lot for the review!

The "arm,prefetch-offset" is not a cells property.

Best regards,
Krzysztof