linux-kernel - Re: [PATCH 11/12] dt-bindings: sound: Add Cirrus Logic CS48L31/32/33 codecs

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Date:   Mon, 14 Nov 2022 12:03:43 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>, lee@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linus.walleij@...aro.org, broonie@...nel.org, tglx@...utronix.de,
        maz@...nel.org
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH 11/12] dt-bindings: sound: Add Cirrus Logic CS48L31/32/33
 codecs

On 14/11/2022 12:00, Richard Fitzgerald wrote:
> On 14/11/2022 08:45, Krzysztof Kozlowski wrote:
>> On 09/11/2022 17:53, Richard Fitzgerald wrote:
>>> Codecs in this family have multiple digital and analog audio I/O that
>>> support a variety of external hardware connections and configurations.
>>>
>>> Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
>>> ---
>>>   .../bindings/sound/cirrus,cs48l32.yaml        | 96 +++++++++++++++++++
>>>   include/dt-bindings/sound/cs48l32.h           | 25 +++++
>>>   2 files changed, 121 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/sound/cirrus,cs48l32.yaml
>>>   create mode 100644 include/dt-bindings/sound/cs48l32.h
>>>
>>> diff --git a/Documentation/devicetree/bindings/sound/cirrus,cs48l32.yaml b/Documentation/devicetree/bindings/sound/cirrus,cs48l32.yaml
>>> new file mode 100644
>>> index 000000000000..70fb294c6dc1
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/sound/cirrus,cs48l32.yaml
>>> @@ -0,0 +1,96 @@
>>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/sound/cirrus,cs48l32.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Cirrus Logic CS48L31/32/33 audio CODECs
>>> +
>>> +maintainers:
>>> +  - patches@...nsource.cirrus.com
>>> +
>>> +description: |
>>> +  This describes audio configuration bindings for these codecs.
>>
>> Don't start with "This". Instead describe the hardware.
>>
>>> +
>>> +  See also the core bindings for the parent MFD driver:
>>> +
>>> +    Documentation/devicetree/bindings/mfd/cirrus,cs48l32.yaml
>>
>> Same comment as for pinctrl patch.
>>
>>> +
>>> +  and defines for values used in these bindings:
>>> +
>>> +    include/dt-bindings/sound/cs48l32.h
>>> +
>>> +  The properties are all contained in the parent MFD node.
>>> +
>>> +properties:
>>
>> Missing compatible. What's the point to organize bindings like that? The
>> schema on its own does nothing - does not match anything.
> 
> Do you mean child drivers should not share the MFD node? Or do you mean
> that if they share the MFD node all the child driver bindings should be
> documented in the MFD schema instead of having a sub-schema for each
> class of hardware functionality?

I mean, that regular binding has a compatible which allows the schema to
be matched.

Splitting parts from top-level properties is used only for re-usable
shared/common schemas, which does not seem the case here.

> 
> I'm certainly willing to collapse all the bindings into a single MFD
> schema yaml. For this driver we followed the same structure that was
> accepted for madera (and there was some discussion when we upstreamed
> madera about how the bindings should be organized which resulted in
> them being changed). We pretty much assumed that the safe bet was to do
> the same that was accepted by the maintainer last time around.

Just merge it with MFD binding.

Best regards,
Krzysztof