linux-kernel - Re: [PATCH 2/4] mfd: dbx500-prcmu: Correctly reorder PRCMU clock identifiers

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Message-ID: <20130607142020.GB24958@gmail.com>
Date:	Fri, 7 Jun 2013 15:20:20 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Loic PALLARDY <loic.pallardy@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	Srinidhi KASAGAR <srinidhi.kasagar@...ricsson.com>
Subject: Re: [PATCH 2/4] mfd: dbx500-prcmu: Correctly reorder PRCMU clock
 identifiers

On Fri, 07 Jun 2013, Linus Walleij wrote:

> On Thu, Jun 6, 2013 at 1:21 PM, Lee Jones <lee.jones@...aro.org> wrote:
> 
> > ... as stipulated by the Hardware Specification document.
> >
> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> 
> I think you need Ulf (as ux500 clock author) and Loic (as PRCMU
> developer) to have a look at this.
> 
> > -enum prcmu_clock {
> > -       PRCMU_SGACLK,
> (...)
> > +#define ARMCLK                 0
> > +#define PRCMU_ACLK             1
> (...)
> 
> It seems the enum and the defines want to do two different things?
> 
> The first is a kernel-internal representation of the clocks, whereas
> the latter is a HW-centric representation for a certain PRCMU
> variant (I guess?)
> 
> Does one actually exclude the other?

>From what I can tell, they're non-ordered values which are used as
read-ins to the clk_mgt array. So long as they are unique I'm not sure
the order matters. The current order seems 'made up', unless I'm
mistaken.

I agree that Ulf should take a look and confirm/deny my findings.

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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