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Date:   Fri, 22 May 2020 16:05:20 -0500
From:   Pierre-Louis Bossart <>
To:     Jason Gunthorpe <>
Cc:     Ranjani Sridharan <>,
        Jeff Kirsher <>,,,,,,,
        Fred Oh <>
Subject: Re: [net-next v4 10/12] ASoC: SOF: Introduce descriptors for SOF

> Maybe if you can present some diagram or something, because I really
> can't understand why asoc is trying to do with virtual bus here.

instead of having a 1:1 mapping between PCI device and a monolithic 
card, we want to split the sound card in multiple orthogonal parts such as:

PCI device
   - local devices (mic/speakers)
   - hdmi devices
   - presence detection/sensing
   - probe/tuning interfaces
   - debug/tests

Initially we wanted to use platform devices but Greg suggested this API 
is abused. We don't have a platform/firmware based enumeration, nor a 
physical bus for each of these subparts, so the virtual bus was suggested.

Does this help?

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