linux-kernel - Re: [RFC PATCH v3 2/2] drivers: mfd: vexpress: add Serial Power Controller (SPC) support

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Date:	Fri, 14 Jun 2013 10:49:48 -0700
From:	Olof Johansson <olof@...om.net>
To:	Pawel Moll <pawel.moll@....com>
Cc:	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Jon Medhurst <tixy@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Achin Gupta <Achin.Gupta@....com>,
	Amit Kucheria <amit.kucheria@...aro.org>
Subject: Re: [RFC PATCH v3 2/2] drivers: mfd: vexpress: add Serial Power
 Controller (SPC) support

On Fri, Jun 14, 2013 at 02:04:00PM +0100, Pawel Moll wrote:
> On Thu, 2013-06-13 at 23:52 +0100, Olof Johansson wrote:
> > > +     reg = <0 0x7FFF0000 0 0x1000>;
> > 
> > #size-cells 2 on the parent bus? That's somewhat unusual. 
> 
> LPAE == 40 bit physical addresses == potential > 32 bit sizes (memory
> blocks > 4GB)

Yeah, I guess that's most commonly needed for the /memory nodes -- having
devices with more than 4GB of register space is quite unusual.

It doesn't really matter much, but it saves some padding of 0s if you
pick a smaller value.

I thought we used 2/1 for address/size-cells on PA Semi hardware, but I just
checked and we had 2/2. Maybe it was Apple that used 2/1.

Anyway, no big deal.


-Olof
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