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

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Message-ID: <20200702122032.GD4483@sirena.org.uk>
Date:   Thu, 2 Jul 2020 13:20:32 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Takashi Iwai <tiwai@...e.de>,
        Pierre-Louis Bossart <pierre-louis.bossart@...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>,
        lee.jones@...aro.org
Subject: Re: [net-next v4 10/12] ASoC: SOF: Introduce descriptors for SOF
 client

On Thu, Jul 02, 2020 at 09:11:47AM -0300, Jason Gunthorpe wrote:
> On Thu, Jul 02, 2020 at 12:15:22PM +0100, Mark Brown wrote:

> > These are very much physical devices often with distinct IPs in distinct
> > address ranges and so on, it's just that those addresses happen not to
> > be on buses it is sensible to memory map.

> But platform bus is all about memmory mapping, so how does the
> subdevice learn the address range and properly share the underlying
> transport?

Hard coding, some out of band mechanism or using an unparented register
region (the resource the code is fine, it's not going to actually look
at the registers described).

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