From: olof@lixom.net (Olof Johansson)
To: linux-arm-kernel@lists.infradead.org
Subject: [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
WARNING: multiple messages have this Message-ID (diff)
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: 46+ 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 ` Lorenzo Pieralisi
2013-06-06 9:59 ` 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 ` Lorenzo Pieralisi
2013-06-06 9:59 ` [RFC PATCH v3 2/2] drivers: mfd: vexpress: add Serial Power Controller (SPC) support Lorenzo Pieralisi
2013-06-06 9:59 ` Lorenzo Pieralisi
2013-06-06 9:59 ` Lorenzo Pieralisi
2013-06-13 0:01 ` Samuel Ortiz
2013-06-13 0:01 ` Samuel Ortiz
2013-06-13 3:26 ` Nicolas Pitre
2013-06-13 3:26 ` Nicolas Pitre
2013-06-13 9:54 ` Lorenzo Pieralisi
2013-06-13 9:54 ` Lorenzo Pieralisi
2013-06-13 22:52 ` Olof Johansson
2013-06-13 22:52 ` Olof Johansson
2013-06-14 0:21 ` Nicolas Pitre
2013-06-14 0:21 ` Nicolas Pitre
2013-06-14 0:21 ` Nicolas Pitre
2013-06-14 12:19 ` Lorenzo Pieralisi
2013-06-14 12:19 ` Lorenzo Pieralisi
2013-06-14 13:04 ` Pawel Moll
2013-06-14 13:04 ` Pawel Moll
2013-06-14 13:04 ` Pawel Moll
2013-06-14 17:49 ` Olof Johansson [this message]
2013-06-14 17:49 ` Olof Johansson
2013-06-11 9:05 ` [RFC PATCH v3 0/2] drivers: mfd: Versatile Express SPC support Lorenzo Pieralisi
2013-06-11 9:05 ` Lorenzo Pieralisi
2013-06-13 0:13 ` Samuel Ortiz
2013-06-13 0:13 ` Samuel Ortiz
2013-06-13 9:45 ` Pawel Moll
2013-06-13 9:45 ` Pawel Moll
2013-06-18 9:09 ` Samuel Ortiz
2013-06-18 9:09 ` Samuel Ortiz
2013-06-18 9:29 ` Pawel Moll
2013-06-18 9:29 ` Pawel Moll
2013-06-19 9:30 ` Samuel Ortiz
2013-06-19 9:30 ` Samuel Ortiz
2013-06-19 12:37 ` Arnd Bergmann
2013-06-19 12:37 ` Arnd Bergmann
2013-06-19 12:55 ` Pawel Moll
2013-06-19 12:55 ` Pawel Moll
2013-06-19 15:03 ` Arnd Bergmann
2013-06-19 15:03 ` Arnd Bergmann
2013-06-19 15:14 ` Pawel Moll
2013-06-19 15:14 ` Pawel Moll
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130614174948.GA15759@quad.lixom.net \
--to=olof@lixom.net \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.