linux-kernel - Re: [PATCH 1/2] dt-bindings: sound: ep93xx: Add I2S and AC'97 descriptions

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Date:   Tue, 14 Feb 2023 15:11:23 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Alexander Sverdlin <alexander.sverdlin@...il.com>,
        devicetree@...r.kernel.org
Cc:     Hartley Sweeten <hsweeten@...ionengravers.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: sound: ep93xx: Add I2S and AC'97
 descriptions

On 14/02/2023 14:02, Alexander Sverdlin wrote:
> Hello Krzysztof,
> 
> thank you for the quick review!
> 
> On Tue, 2023-02-14 at 11:58 +0100, Krzysztof Kozlowski wrote:
>>> +properties:
>>> +  compatible:
>>> +    const: cirrus,ep9301-i2s
>>> +
>>> +  '#sound-dai-cells':
>>> +    const: 0
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  interrupts:
>>> +    maxItems: 1
>>> +
>>> +  clocks:
>>> +    minItems: 3
>>
>> maxItems instead
> 
> reg and clocks are required, I suppose I should include both minItems
> and maxItems for both of them?

No. minItems is implied.

> 
>>> +
>>> +  clock-names:
>>> +    items:
>>> +      - const: mclk
>>> +      - const: sclk
>>> +      - const: lrclk
>>
>>
>> The clk suffixes are quite redundant. Don't these inputs have some
>> meaningful name?
> 
> They are actually meaningful, as they are usually named in I2S, please
> refer to the EP93xx User's Guide:
> https://cdn.embeddedts.com/resource-attachments/ts-7000_ep9301-ug.pdf
> page 71, for instance.

OK, but then I like the example - if datasheet would use name
"clk_clk_this_is_clk" would you still find it meaningful?

Every clock input in clocks is a clock. There is usually no need to say
that a clock is a clock...

> 

Best regards,
Krzysztof