linux-kernel - Re: [PATCH 08/14] dt-bindings: ufs: qcom: Add sm6115 binding

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Message-ID: <72f86c4f-79fa-bff4-f14e-4cd7fa7ce41f@gmail.com>
Date:   Mon, 5 Sep 2022 10:29:23 +0300
From:   Iskren Chernev <iskren.chernev@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/14] dt-bindings: ufs: qcom: Add sm6115 binding



On 9/4/22 22:10, Krzysztof Kozlowski wrote:
> On 03/09/2022 19:54, Iskren Chernev wrote:
>>
>>
>> On 9/1/22 19:11, Krzysztof Kozlowski wrote:
>>> On 01/09/2022 10:24, Iskren Chernev wrote:
>>>> Add SM6115 UFS to DT schema.
>>>>
>>>> Signed-off-by: Iskren Chernev <iskren.chernev@...il.com>
>>>> ---
>>>>  .../devicetree/bindings/ufs/qcom,ufs.yaml     | 26 +++++++++++++++++++
>>>>  1 file changed, 26 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml b/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
>>>> index f2d6298d926c..7c5f6e2e6d4c 100644
>>>> --- a/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
>>>> +++ b/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
>>>> @@ -28,6 +28,7 @@ properties:
>>>>            - qcom,msm8998-ufshc
>>>>            - qcom,sc8280xp-ufshc
>>>>            - qcom,sdm845-ufshc
>>>> +          - qcom,sm6115-ufshc
>>>>            - qcom,sm6350-ufshc
>>>>            - qcom,sm8150-ufshc
>>>>            - qcom,sm8250-ufshc
>>>> @@ -178,6 +179,31 @@ allOf:
>>>>            minItems: 1
>>>>            maxItems: 1
>>>>
>>>> +  - if:
>>>> +      properties:
>>>> +        compatible:
>>>> +          contains:
>>>> +            enum:
>>>> +              - qcom,sm6115-ufshc
>>>> +    then:
>>>> +      properties:
>>>> +        clocks:
>>>> +          minItems: 8
>>>> +          maxItems: 8
>>>> +        clock-names:
>>>> +          items:
>>>> +            - const: core_clk
>>>> +            - const: bus_aggr_clk
>>>> +            - const: iface_clk
>>>> +            - const: core_clk_unipro
>>>> +            - const: core_clk_ice
>>>
>>> Use existing name and put it in the same place as existing variant - sdm845:
>>> ice_core_clk
>>
>> The only problem with sdm845 bindings is the presence of rx_lane1_sync_clk
>> clock. I'm guessing I could pass zeros there, because it shouldn't be used. Or
>> it could be moved to last property and then min/maxItems to guard, but that is
>> a change to something more-or-less immutable.
>
> I don't understand - what is the problem here. How presence of some
> clock affects name of other clock and its place/location in list of clocks?

qcom,sdm845-ufshc has 9 clocks, one of which is rx_lane1_sync_clk.
qcom,sm6115-ufshc has 8 clocks (all of the ones in sdm845 without
rx_lane1_sync_clk). So if I'm understanding correctly, you want to put the
sm6115 with sdm845, which means re-use the clocks and reg specification from
sdm845, which means sm6115 will "inherit" this rx_lane1_sync_clk, and then
I have to put it in DT (otherwise the schema would complain), and I'm asking if
I can put an empty (i.e <0 0>) value, so schema is satisfied but clock is still
not really passed.

> Best regards,
> Krzysztof