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

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Date:   Mon, 29 Jun 2020 19:59:59 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Mark Brown <broonie@...nel.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>, Takashi Iwai <tiwai@...e.de>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, nhorman@...hat.com,
        sassmann@...hat.com, Fred Oh <fred.oh@...ux.intel.com>
Subject: Re: [net-next v4 10/12] ASoC: SOF: Introduce descriptors for SOF
 client

On Mon, Jun 29, 2020 at 09:33:17PM +0100, Mark Brown wrote:
> On Wed, May 27, 2020 at 09:17:33AM +0200, Greg KH wrote:
> 
> > Ok, that's good to hear.  But platform devices should never be showing
> > up as a child of a PCI device.  In the "near future" when we get the
> > virtual bus code merged, we can convert any existing users like this to
> > the new code.
> 
> What are we supposed to do with things like PCI attached FPGAs and ASICs
> in that case?  They can have host visible devices with physical
> resources like MMIO ranges and interrupts without those being split up
> neatly as PCI subfunctions - the original use case for MFD was such
> ASICs, there's a few PCI drivers in there now. 

Greg has been pretty clear that MFD shouldn't have been used on top of
PCI drivers.

In a sense virtual bus is pretty much MFD v2.

Jason