linux-kernel - Re: [PATCH 2/3] ASoC: dt-bindings: xmos,xvf3500: add bindings for XMOS XVF3500

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Date: Mon, 15 Jan 2024 15:35:46 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Javier Carrasco <javier.carrasco@...fvision.net>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
 Takashi Iwai <tiwai@...e.com>
Cc: Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org
Subject: Re: [PATCH 2/3] ASoC: dt-bindings: xmos,xvf3500: add bindings for
 XMOS XVF3500

On 15/01/2024 14:58, Javier Carrasco wrote:
> On 15.01.24 14:02, Krzysztof Kozlowski wrote:
>> On 15/01/2024 10:16, Javier Carrasco wrote:
>>> The XMOS XVF3500 VocalFusion Voice Processor[1] is a low-latency, 32-bit
>>> multicore controller for voice processing.
>>>
>>> Add new bindings to define the device properties.
>>
>> I don't see any bus, so how does it work? How do you get the voice data
>> from it? I also do not see any DAI: neither here nor in the driver...
>>
> The voice data and any other information can be retrieved directly via
> USB from userspace. Once in normal operation, the device acts as a
> regular "onboard" USB device and the driver does not need to do any
> further management.

So is this an USB device? If yes, then shouldn't be just auto-discovered
and you add here some bindings for other device? This looks like coding
power sequence not in USB node, but in some other, new node.

Best regards,
Krzysztof