linux-kernel - Re: [PATCH 3/5] soc: Mediatek: Add SCPSYS power domain driver

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Date:	Wed, 20 May 2015 16:03:25 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Matthias Brugger <matthias.bgg@...il.com>
Cc:	Daniel Kurtz <djkurtz@...omium.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	Kevin Hilman <khilman@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mediatek@...ts.infradead.org,
	Sasha Hauer <kernel@...gutronix.de>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH 3/5] soc: Mediatek: Add SCPSYS power domain driver

On Tue, May 19, 2015 at 01:06:10PM +0200, Matthias Brugger wrote:
> 2015-05-19 12:30 GMT+02:00 Sascha Hauer <s.hauer@...gutronix.de>:
> >
> > I'll check for errors next round. However, I cannot bail out in this
> > case since once pm_genpd_init() is called the domain cannot be
> > unregistered anymore.
> 
> We should think of implementing this.
> I had a quick look on it, and from what I understand as long as you
> don't have any subdomains, devices and masters added, it's just
> deleting an element from a linked list.

In my error path I would have subdomains added though, so I would need
that to be handled.

> Maybe we should split this in pm_genpd_prepare and pm_genpd_add, with
> the last one actually adding the generic_pm_domain to gpd_list.
> 
> This way we could also get rid of the two for loops.

Well, with pm_genpd_prepare and pm_genpd_add I would still need two
loops, one for preparing and one for adding.

I'm not sure how useful it really is to be able to unregister power
domains. For now I suggest to continue with the domains that are
successfully registered. I'll look into it should the pm domain
maintainers request it.

Sascha

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