netdev - Re: [net-next v4 10/12] ASoC: SOF: Introduce descriptors for SOF client

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Date:   Wed, 20 May 2020 09:20:31 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:     davem@...emloft.net,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com, jgg@...pe.ca,
        pierre-louis.bossart@...ux.intel.com,
        Fred Oh <fred.oh@...ux.intel.com>
Subject: Re: [net-next v4 10/12] ASoC: SOF: Introduce descriptors for SOF
 client

On Wed, May 20, 2020 at 12:02:25AM -0700, Jeff Kirsher wrote:
> From: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
> 
> A client in the SOF (Sound Open Firmware) context is a
> device that needs to communicate with the DSP via IPC
> messages. The SOF core is responsible for serializing the
> IPC messages to the DSP from the different clients. One
> example of an SOF client would be an IPC test client that
> floods the DSP with test IPC messages to validate if the
> serialization works as expected. Multi-client support will
> also add the ability to split the existing audio cards
> into multiple ones, so as to e.g. to deal with HDMI with a
> dedicated client instead of adding HDMI to all cards.
> 
> This patch introduces descriptors for SOF client driver
> and SOF client device along with APIs for registering
> and unregistering a SOF client driver, sending IPCs from
> a client device and accessing the SOF core debugfs root entry.
> 
> Along with this, add a couple of new members to struct
> snd_sof_dev that will be used for maintaining the list of
> clients.

Here is where you are first using a virtual bus driver, and yet, no
mention of that at all in the changelog.  Why?

Why are virtual devices/busses even needed here?

greg k-h