linux-kernel - Re: [PATCH 1/4] dt-bindings: remoteproc: fsl,imx-rproc: add new compatible

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Message-ID: <8a017e66-6d84-4bdf-8188-9ae3428b6d17@gmail.com>
Date: Thu, 24 Oct 2024 13:47:53 +0300
From: Laurentiu Mihalcea <laurentiumihalcea111@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Shawn Guo <shawnguo@...nel.org>, Daniel Baluta <daniel.baluta@....com>,
 Peng Fan <peng.fan@....com>, Mark Brown <broonie@...nel.org>,
 Takashi Iwai <tiwai@...e.com>,
 Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
 Bard Liao <yung-chuan.liao@...ux.intel.com>,
 Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
 Jaroslav Kysela <perex@...ex.cz>,
 Pierre-Louis Bossart <pierre-louis.bossart@...ux.dev>,
 Conor Dooley <conor+dt@...nel.org>,
 Mathieu Poirier <mathieu.poirier@...aro.org>,
 Iuliana Prodan <iuliana.prodan@....com>, linux-remoteproc@...r.kernel.org,
 devicetree@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-sound@...r.kernel.org,
 sound-open-firmware@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: remoteproc: fsl,imx-rproc: add new
 compatible



On 10/24/2024 10:45 AM, Krzysztof Kozlowski wrote:
> On Wed, Oct 23, 2024 at 12:21:11PM -0400, Laurentiu Mihalcea wrote:
>> From: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
>>
>> Add new compatible for imx95's CM7 with SOF.
>>
>> Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
>> ---
>>  .../bindings/remoteproc/fsl,imx-rproc.yaml    | 58 +++++++++++++++++--
>>  1 file changed, 53 insertions(+), 5 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml
>> index 57d75acb0b5e..ab0d8e017965 100644
>> --- a/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml
>> +++ b/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml
>> @@ -28,6 +28,15 @@ properties:
>>        - fsl,imx8qxp-cm4
>>        - fsl,imx8ulp-cm33
>>        - fsl,imx93-cm33
>> +      - fsl,imx95-cm7-sof
>> +
>> +  reg:
>> +    maxItems: 2
>> +
>> +  reg-names:
>> +    items:
>> +      - const: dram
>> +      - const: mailbox
> That's quite different programming model. Are you sure these are devices
> from similar class/type?
Yep, these are all Cortex-M cores. It's just that their usage differs quite a lot.
>
> Your big if:then: block suggests this could be separate binding.
Ideally I would have wanted to place the compatible inside dsp/fsl,dsp.yaml as the
programming model would have been more similar.

Unfortunately, these are different physical devices (HiFi DSP core vs CM core) even
though they're all used for DSP purposes so I'm not sure this is entirely appropriate.

Alternatively, if you think grouping these devices (i.e: those represented by the -dsp compatibles
from fsl,dsp and the one represented by the compatible introduced here) under the same binding
is alright we can just branch off from fsl,dsp and fsl,imx-rproc and create a new binding for
these devices. I'm expecting this to be relatively clean as they have the same programming
model.

Let me know your thoughts on this.
>
> Best regards,
> Krzysztof
>