linux-kernel - Re: [resend/standalone PATCH v4] Add auxiliary bus support

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Date:   Fri, 18 Dec 2020 10:08:54 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Mark Brown <broonie@...nel.org>
CC:     Greg KH <gregkh@...uxfoundation.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        <alsa-devel@...a-project.org>, Kiran Patil <kiran.patil@...el.com>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Martin Habets <mhabets@...arflare.com>,
        "Liam Girdwood" <lgirdwood@...il.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Fred Oh <fred.oh@...ux.intel.com>,
        "Dave Ertman" <david.m.ertman@...el.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Netdev <netdev@...r.kernel.org>,
        Leon Romanovsky <leonro@...dia.com>,
        David Miller <davem@...emloft.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Parav Pandit <parav@...lanox.com>, <lee.jones@...aro.org>
Subject: Re: [resend/standalone PATCH v4] Add auxiliary bus support

On Fri, Dec 18, 2020 at 01:17:09PM +0000, Mark Brown wrote:

> As previously discussed this will need the auxilliary bus extending to
> support at least interrupts and possibly also general resources.

I thought the recent LWN article summed it up nicely, auxillary bus is
for gluing to subsystems together using a driver specific software API
to connect to the HW, MFD is for splitting a physical HW into disjoint
regions of HW.

Maybe there is some overlap, but if you want to add HW representations
to the general auxillary device then I think you are using it for the
wrong thing.

Jason