linux-kernel - Re: [PATCH v2 3/3] dt-bindings: arm: msm: Convert kpss-gcc driver Documentation to yaml

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Date:   Sun, 1 May 2022 10:26:47 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 3/3] dt-bindings: arm: msm: Convert kpss-gcc driver
 Documentation to yaml

On 30/04/2022 09:42, Ansuel Smith wrote:
> On Sat, Apr 30, 2022 at 04:40:54PM +0200, Krzysztof Kozlowski wrote:
>> On 30/04/2022 08:01, Ansuel Smith wrote:
>>> Convert kpss-gcc driver Documentation to yaml.
>>> Add #clock-cells additional binding to required bindings and example
>>> as it's a required binding for clock-output-names.
>>>
>>> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
>>
>>
>> (...)
>>
>>> +properties:
>>> +  compatible:
>>> +    items:
>>> +      - enum:
>>> +          - qcom,kpss-gcc-ipq8064
>>> +          - qcom,kpss-gcc-apq8064
>>> +          - qcom,kpss-gcc-msm8974
>>> +          - qcom,kpss-gcc-msm8960
>>> +      - const: qcom,kpss-gcc
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  clocks:
>>> +    items:
>>> +      - description: phandle to pll8_vote
>>> +      - description: phandle to pxo_board
>>> +
>>> +  clock-names:
>>> +    items:
>>> +      - const: pll8_vote
>>> +      - const: pxo
>>> +
>>> +  clock-output-names:
>>> +    const: acpu_l2_aux
>>
>> It does not make sense having a constant output name. What is the
>> meaning this property in such case? The original binding did not enforce it.
>>
>>
>>
>> Best regards,
>> Krzysztof
> 
> Mh. Should I just drop the const and put a description referring to an
> advised name? The driver with the kpss-gcc hardcode the name to
> acpu_l2_aux that's why I thought it was a correct conversion using a
> const but I assume this is another problem of not making a correct 1:1
> conversion and adding fixes on pure conversion.

Hard-coding a name by implementation is not a reason to put that name in
DTS. DTS is not a place for values stored in the driver.

> Think I should drop it and put a description to it. (and then later fix
> it when I will push the other series with all the tweaks)

The driver kpss-gcc does not use this property at all, so I am not sure
if there is a point to even keep it. Any other user of bindings makes
use of the property?


Best regards,
Krzysztof