linux-kernel - Re: [RFC 2/7] domainsctrl: Introduce domains controller framework

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Message-ID: <20190121125648.GC12679@sirena.org.uk>
Date:   Mon, 21 Jan 2019 12:56:48 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Benjamin GAIGNARD <benjamin.gaignard@...com>
Cc:     "robh@...nel.org" <robh@...nel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Loic PALLARDY <loic.pallardy@...com>,
        "benjamin.gaignard@...aro.org" <benjamin.gaignard@...aro.org>
Subject: Re: [RFC 2/7] domainsctrl: Introduce domains controller framework

On Fri, Jan 18, 2019 at 09:26:45AM +0000, Benjamin GAIGNARD wrote:
> On 1/17/19 6:27 PM, Mark Brown wrote:
> > On Mon, Jan 14, 2019 at 03:41:57PM +0100, Benjamin Gaignard wrote:

> > Do you have any clients in the works for this?  It seems fairly likely
> > that everything is fine in terms of setting the mode but it'd be good to
> > confirm that's the case.  The main thing I can think of that might be a

> Patch 3 use those functions to apply the default configuration before probing
> a driver (or after unbind it). I have in mind that drivers could ask to apply

Right, I saw that but I was more thinking of individual drivers.

> a configuration like it is done for pinctrl in resume/suspend functions.
> An example of that could be to start the hardware block on the main processor
> and, when going to sleep, change the configuration to grant the access to lower
> power processor.

Yes, that sounds like a good application.  I can also imagine something
like handing some hardware over to an acceleration engine (or a smaller
microcontroller core acting as one).

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