linux-kernel - Re: [PATCH v13 6/8] media: dt-bindings: wave5: add Chips&Media 521c codec IP support

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Message-ID: <20231021120526.eqe3esyxyi5b3e5d@basti-XPS-13-9310>
Date:   Sat, 21 Oct 2023 14:05:26 +0200
From:   Sebastian Fricke <sebastian.fricke@...labora.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        NXP Linux Team <linux-imx@....com>,
        Conor Dooley <conor+dt@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jackson Lee <jackson.lee@...psnmedia.com>,
        Hans Verkuil <hverkuil@...all.nl>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Nas Chung <nas.chung@...psnmedia.com>,
        Fabio Estevam <festevam@...il.com>,
        linux-media@...r.kernel.org, Tomasz Figa <tfiga@...omium.org>,
        linux-kernel@...r.kernel.org,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        kernel@...labora.com, Robert Beckett <bob.beckett@...labora.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Darren Etheridge <detheridge@...com>
Subject: Re: [PATCH v13 6/8] media: dt-bindings: wave5: add Chips&Media 521c
 codec IP support

Hey Rob and Krzysztof,

On 16.10.2023 08:47, Rob Herring wrote:
>On Thu, Oct 12, 2023 at 03:24:12PM +0200, Krzysztof Kozlowski wrote:
>> On 12/10/2023 13:01, Sebastian Fricke wrote:
>> > From: Robert Beckett <bob.beckett@...labora.com>
>> >
>> > Add bindings for the chips&media wave5 codec driver
>> >
>> > Signed-off-by: Robert Beckett <bob.beckett@...labora.com>
>> > Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
>> > Signed-off-by: Sebastian Fricke <sebastian.fricke@...labora.com>
>> > ---
>> >  .../devicetree/bindings/media/cnm,wave5.yaml       | 60 ++++++++++++++++++++++
>> >  1 file changed, 60 insertions(+)
>> >
>> > diff --git a/Documentation/devicetree/bindings/media/cnm,wave5.yaml b/Documentation/devicetree/bindings/media/cnm,wave5.yaml
>> > new file mode 100644
>> > index 000000000000..b31d34aec05b
>> > --- /dev/null
>> > +++ b/Documentation/devicetree/bindings/media/cnm,wave5.yaml
>> > @@ -0,0 +1,60 @@
>> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> > +%YAML 1.2
>> > +---
>> > +$id: http://devicetree.org/schemas/media/cnm,wave5.yaml#
>>
>> Filename matching compatible, so: cnm,cm521c-vpu.yaml

With which compatible should the filename match? (see below)
And just to be sure, this means that I rename the file to:
`.../devicetree/bindings/media/cnm,wave521c.yaml`

>>
>> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> > +
>> > +title: Chips&Media Wave 5 Series multi-standard codec IP
>> > +
>> > +maintainers:
>> > +  - Nas Chung <nas.chung@...psnmedia.com>
>> > +  - Jackson Lee <jackson.lee@...psnmedia.com>
>> > +
>> > +description:
>> > +  The Chips&Media WAVE codec IP is a multi format video encoder/decoder
>> > +
>> > +properties:
>> > +  compatible:
>> > +    enum:
>> > +      - cnm,cm521c-vpu
>>
>> Can this device be anything else? Why VPU suffix?
>
>It needs an SoC specific compatible (TI something...) as well (or
>instead). Unless there's a public spec with details on how many
>clocks, resets, interrupts, etc. there are.

Okay so how about this, a bit similar to the Coda driver supplying both
a general option and a SoC specific version:

properties:
   compatible:
     enum:
       - ti,k3-j721sX-wave521c
       - cnm,wave521c

(ti,k3-j721sX-wave521c = manufacturer,SoC-codec)
(tested on j721s2 but should work on other variations as well)

Another alternative could be: ti,k3-wave521c (less specific on a single
SoC series but connected to a bigger range of devices)

>
>Rob

Regards,
Sebastian

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