From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: How to handle named resources with DT?
Date: Mon, 29 Aug 2011 00:43:03 +0100 [thread overview]
Message-ID: <20110828234303.GB14560@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <alpine.DEB.2.00.1108281100150.23968@utopia.booyaka.com>
On Sun, Aug 28, 2011 at 05:06:43PM -0600, Paul Walmsley wrote:
> DMA resource data are usually DMA request line ID numbers.
Not always. On ARMs development platforms, we ended up using strings -
because we've ended up with a DMA controller with N request signals,
where the first three request signals come from a MUX which assigns
them to other devices in the system.
An opaque number doesn't hack it because you start having to define
arbitary ranges for such things, and that very quickly starts getting
you into sticky problems when you have to work out that request
signal S1 is routed through mux M1 which is connected to DMA request
signal D1, and if M1 is in use, then maybe M2 can be used instead
which routes to DMA request signal D2.
The idea that DMA should be small integers is very limiting.
next prev parent reply other threads:[~2011-08-28 23:43 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-09 9:23 How to handle named resources with DT? Cousson, Benoit
2011-08-09 16:29 ` G, Manjunath Kondaiah
2011-08-09 16:57 ` Cousson, Benoit
2011-08-09 17:23 ` Grant Likely
2011-08-09 17:47 ` Cousson, Benoit
2011-08-09 17:52 ` Matt Porter
2011-08-09 18:26 ` Scott Wood
2011-08-09 20:57 ` Grant Likely
2011-08-09 21:08 ` Cousson, Benoit
2011-08-09 21:17 ` Grant Likely
2011-08-09 21:44 ` Cousson, Benoit
2011-08-09 21:49 ` Grant Likely
2011-08-09 21:53 ` Cousson, Benoit
2011-08-10 1:52 ` David Gibson
2011-08-10 7:11 ` Paul Walmsley
2011-08-10 15:01 ` Cousson, Benoit
2011-08-10 15:18 ` Scott Wood
2011-08-10 15:21 ` Cousson, Benoit
2011-08-10 19:22 ` Grant Likely
2011-08-10 19:57 ` David Brown
2011-08-10 20:12 ` Grant Likely
2011-08-11 12:28 ` Cousson, Benoit
2011-08-12 3:02 ` David Gibson
2011-08-12 8:14 ` Cousson, Benoit
2011-08-12 8:41 ` Felipe Balbi
2011-08-12 14:35 ` Arnd Bergmann
2011-08-12 15:09 ` Cousson, Benoit
2011-08-12 17:21 ` Grant Likely
2011-08-24 19:15 ` Kevin Hilman
2011-08-24 23:16 ` Felipe Balbi
2011-08-25 10:28 ` Russell King - ARM Linux
2011-08-25 15:05 ` Arnd Bergmann
2011-08-25 18:16 ` Kevin Hilman
2011-08-25 21:02 ` Arnd Bergmann
2011-08-26 11:01 ` Removing platform_get_resource_byname() (was Re: How to handle named resources with DT?) Paul Walmsley
2011-08-26 4:12 ` How to handle named resources with DT? David Gibson
2011-08-26 10:58 ` Arnd Bergmann
2011-08-26 13:06 ` David Gibson
2011-08-26 15:35 ` Arnd Bergmann
2011-08-26 15:41 ` Arnd Bergmann
2011-08-27 14:37 ` David Gibson
2011-08-27 18:13 ` Arnd Bergmann
2011-08-27 19:31 ` Paul Walmsley
2011-08-29 17:16 ` Arnd Bergmann
2011-08-28 8:39 ` David Gibson
2011-08-28 23:06 ` Paul Walmsley
2011-08-28 23:43 ` Russell King - ARM Linux [this message]
2011-08-29 1:57 ` Paul Walmsley
2011-08-29 17:18 ` Arnd Bergmann
2011-08-27 21:47 ` Paul Walmsley
2011-08-29 21:54 ` Mark Brown
2011-08-26 14:13 ` Cousson, Benoit
2011-08-30 2:29 ` David Gibson
2011-08-30 9:27 ` Felipe Balbi
2011-08-31 2:32 ` David Gibson
2011-08-27 20:00 ` Paul Walmsley
2011-08-25 17:38 ` Cousson, Benoit
2011-08-09 21:52 ` Scott Wood
2011-08-09 20:55 ` Grant Likely
2011-08-09 21:06 ` Cousson, Benoit
2011-08-09 21:16 ` Grant Likely
2011-08-09 21:37 ` Cousson, Benoit
2011-08-12 4:10 ` Shawn Guo
2011-08-12 8:56 ` Cousson, Benoit
2011-08-12 11:47 ` Shawn Guo
2011-08-12 14:40 ` Arnd Bergmann
2011-08-10 1:29 ` David Gibson
2011-08-10 6:08 ` Paul Walmsley
2011-08-09 19:51 ` Russell King - ARM Linux
2011-08-09 20:59 ` Cousson, Benoit
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=20110828234303.GB14560@n2100.arm.linux.org.uk \
--to=linux@arm.linux.org.uk \
--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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).