From: Olof Johansson <olof@lixom.net>
To: Pawel Moll <pawel.moll@arm.com>
Cc: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"devicetree-discuss@lists.ozlabs.org"
<devicetree-discuss@lists.ozlabs.org>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
Jon Medhurst <tixy@linaro.org>,
Samuel Ortiz <sameo@linux.intel.com>,
Achin Gupta <Achin.Gupta@arm.com>,
Amit Kucheria <amit.kucheria@linaro.org>
Subject: Re: [RFC PATCH v3 2/2] drivers: mfd: vexpress: add Serial Power Controller (SPC) support
Date: Fri, 14 Jun 2013 10:49:48 -0700 [thread overview]
Message-ID: <20130614174948.GA15759@quad.lixom.net> (raw)
In-Reply-To: <1371215040.3154.6.camel@hornet>
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
next prev parent reply other threads:[~2013-06-14 17:49 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-06 9:59 [RFC PATCH v3 0/2] drivers: mfd: Versatile Express SPC support Lorenzo Pieralisi
2013-06-06 9:59 ` [RFC PATCH v3 1/2] drivers: mfd: refactor the vexpress config bridge API Lorenzo Pieralisi
2013-06-06 9:59 ` [RFC PATCH v3 2/2] drivers: mfd: vexpress: add Serial Power Controller (SPC) support Lorenzo Pieralisi
2013-06-13 0:01 ` Samuel Ortiz
2013-06-13 3:26 ` Nicolas Pitre
2013-06-13 9:54 ` Lorenzo Pieralisi
2013-06-13 22:52 ` Olof Johansson
2013-06-14 0:21 ` Nicolas Pitre
2013-06-14 12:19 ` Lorenzo Pieralisi
2013-06-14 13:04 ` Pawel Moll
2013-06-14 17:49 ` Olof Johansson [this message]
2013-06-11 9:05 ` [RFC PATCH v3 0/2] drivers: mfd: Versatile Express SPC support Lorenzo Pieralisi
2013-06-13 0:13 ` Samuel Ortiz
2013-06-13 9:45 ` Pawel Moll
2013-06-18 9:09 ` Samuel Ortiz
2013-06-18 9:29 ` Pawel Moll
2013-06-19 9:30 ` Samuel Ortiz
2013-06-19 12:37 ` Arnd Bergmann
2013-06-19 12:55 ` Pawel Moll
2013-06-19 15:03 ` Arnd Bergmann
2013-06-19 15:14 ` Pawel Moll
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