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 12:34:09 +0000
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <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 11:03, Krzysztof Kozlowski wrote:
> 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.
> 

Ok, that's good. None of these drivers are re-useable standalone.
I'll squash the bindings all into MFD schema for V2.

>>
>> 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
>