linux-kernel - Re: [RESEND PATCH v16 4/4] ARM: dts: add the support power-domain node on RK3288 SoCs

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Date:	Thu, 27 Aug 2015 19:03:20 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Kevin Hilman <khilman@...nel.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Caesar Wang <wxt@...k-chips.com>,
	Heiko Stübner <heiko@...ech.de>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"jinkun.hong" <jinkun.hong@...k-chips.com>
Subject: Re: [RESEND PATCH v16 4/4] ARM: dts: add the support power-domain
 node on RK3288 SoCs

Kevin,

On Thu, Aug 27, 2015 at 5:24 PM, Kevin Hilman <khilman@...nel.org> wrote:
>> That is not really workable: the attach and detach happen in
>> probe/remove path; if you do not have driver for the device you will
>> miss the clocks for it.
>
> And in my proposal, I suggested that clocks without drivers are
> good candidates to list in the domain, with the caveat that the be
> called out (documented) as being device clocks that are missing a
> driver, so when a driver shows up they can be moved accordingly, and in
> a way that actually describes the hardware.

What happens if someone disables the driver using the CONFIG subsystem?

What happens if this is a device that someone has set to 'status =
"disabled";' in the device tree?

Even if the device is disabled in one of those two ways, we still need
the clocks to be turned on.  ...so if we turn on/off the VIO domain we
need to turn on the EDP clock even if there's no EDP in the current
board / config.  We might turn on/off VIO for one of the other devices
in the VIO domain for one of the other devices in VIO that we are
using.

-Doug
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