linux-kernel - Re: [PATCH 13/25] ASoC: dt-bindings: meson: axg-pdm: document 'sysrate' property

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Date: Fri, 15 Mar 2024 11:22:59 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Jan Dakinevich <jan.dakinevich@...utedevices.com>, Neil Armstrong
 <neil.armstrong@...aro.org>, Jerome Brunet <jbrunet@...libre.com>, Michael
 Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, Rob
 Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 Philipp Zabel <p.zabel@...gutronix.de>, Kevin Hilman
 <khilman@...libre.com>, Martin Blumenstingl
 <martin.blumenstingl@...glemail.com>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Linus Walleij <linus.walleij@...aro.org>,
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
 linux-sound@...r.kernel.org, linux-gpio@...r.kernel.org,
 kernel@...utedevices.com
Subject: Re: [PATCH 13/25] ASoC: dt-bindings: meson: axg-pdm: document
 'sysrate' property


On Fri 15 Mar 2024 at 11:00, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 15/03/2024 00:21, Jan Dakinevich wrote:
>> This option allow to redefine the rate of DSP system clock.
>
> And why is it suitable for bindings? Describe the hardware, not what you
> want to do in the driver.
>
>> 
>> Signed-off-by: Jan Dakinevich <jan.dakinevich@...utedevices.com>
>> ---
>>  Documentation/devicetree/bindings/sound/amlogic,axg-pdm.yaml | 4 ++++
>>  1 file changed, 4 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/sound/amlogic,axg-pdm.yaml b/Documentation/devicetree/bindings/sound/amlogic,axg-pdm.yaml
>> index df21dd72fc65..d2f23a59a6b6 100644
>> --- a/Documentation/devicetree/bindings/sound/amlogic,axg-pdm.yaml
>> +++ b/Documentation/devicetree/bindings/sound/amlogic,axg-pdm.yaml
>> @@ -40,6 +40,10 @@ properties:
>>    resets:
>>      maxItems: 1
>>  
>> +  sysrate:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    description: redefine rate of DSP system clock
>
> No vendor prefix, so is it a generic property? Also, missing unit
> suffix, but more importantly I don't understand why this is a property
> of hardware.

+1.

The appropriate way to set rate of the clock before the driver take over
is 'assigned-rate', if you need to customize this for different
platform.

Then you don't have to deal with it in the device driver.

>
> Best regards,
> Krzysztof


-- 
Jerome