Re: [PATCH 1/2] spi: bcm2835: add spi-bcm2835aux driver for the auxiliar spi1 and spi2

From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
To: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
Cc: "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	"linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Lee Jones <lee-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH 1/2] spi: bcm2835: add spi-bcm2835aux driver for the auxiliar spi1 and spi2
Date: Fri, 31 Jul 2015 20:55:59 -0600	[thread overview]
Message-ID: <55BC353F.1000906@wwwdotorg.org> (raw)
In-Reply-To: <55B75E07.1080104-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>

On 07/28/2015 04:48 AM, Martin Sperl wrote:
> On 28.07.2015 08:18, Martin Sperl wrote:
>> Hi Stephen!
>> But the bigger question you have not answered is: “where should such an
>> auxiliar driver go in the kernel tree?” i.e. which directory?
>
> One thing: could the "module" be a regulator?

The HW docs aren't very detailed on this point, but they certainly don't
state that these bits control a regulator (or power domain as mentioned
later in the thread). I guess it's possible, but it feels like an
assumption to me. The HW modules seem small enough that it doesn't feel
likely anyone would have bothered with power-gating them.
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