linux-kernel - Re: [PATCH 1/2] ASoC: dt-bindings: Add adi,ssm3515 amp schema

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Message-ID: <0fcc4617-e706-8743-e65d-1ff99f38ddac@linaro.org>
Date:   Wed, 10 May 2023 10:30:50 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Martin Povišer <povik+lin@...ebit.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Nuno Sá <nuno.sa@...log.com>,
        asahi@...ts.linux.dev, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ASoC: dt-bindings: Add adi,ssm3515 amp schema

On 10/05/2023 10:29, Martin Povišer wrote:
> 
> 
>> On 10. 5. 2023, at 10:23, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
>>
>> On 10/05/2023 10:15, Martin Povišer wrote:
>>>
>>>> On 10. 5. 2023, at 9:51, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
>>>>
>>>> On 09/05/2023 18:38, Martin Povišer wrote:
>>>>> Add a DT schema for the SSM3515 amp by Analog Devices. It's a simple
>>>>> mono amplifier with digital input.
>>>>>
>>>>> Signed-off-by: Martin Povišer <povik+lin@...ebit.org>
> 
>>>>> +additionalProperties: true
>>>>
>>>> uinevaluatedProperties: false instead, so users can have name-prefix.
>>>
>>> I actually tweaked this to have the example passing, which has sound-name-prefix,
>>
>> true is not allowed anyway - it makes your schema simply not effective
>> almost at all as it allows anything...
> 
> That makes sense.
> 
>>> which I guess is what you have in mind. Not that I exactly understand what these
>>> options do (both additionalProperties and unevaluatedProperties), the schema docs
>>> didn’t enlighten me right away when I looked into it.
>>
>> The way to go and to start always is to look at example-schema. It tells
>> you explicitly to use additionalProperties:false and switch to
>> unevaluated "If and only if another schema is referenced".
> 
> OK. While I have you on the line, what does unevaluated do? In what sense are props
> unevaluated?

Properties can be evaluated by some other referenced schema (e.g.
dai-common.yaml). If nothing evaluated them, they are unevaluated, thus
unknown and not allowed.

Best regards,
Krzysztof