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Message-ID: <3d465d3c-386d-467b-87e9-806962464ac5@linaro.org>
Date: Sun, 22 Oct 2023 18:01:31 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Sebastian Fricke <sebastian.fricke@...labora.com>,
Rob Herring <robh@...nel.org>
Cc: 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
On 21/10/2023 14:05, Sebastian Fricke wrote:
> 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
>>>> +---
>>>> +$id: http://devicetree.org/schemas/media/cnm,wave5.yaml#
>>>
>>> Filename matching compatible, so: cnm,cm521c-vpu.yaml
>
> With which compatible should the filename match? (see below)
> And just to be sure, this means that I rename the file to:
> `.../devicetree/bindings/media/cnm,wave521c.yaml`
With the fallback compatible.
>
>>>
>>>> +$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:
Can generic compatible be used alone in board designs? If it is licensed
block, then most likely you want a fallback.
>
> 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)
Best regards,
Krzysztof
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