linux-kernel - [PATCHv4 0/4] Introduce the /proc/socinfo and use it to export OMAP data

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Message-Id: <1273487857-32281-1-git-send-email-eduardo.valentin@nokia.com>
Date:	Mon, 10 May 2010 13:37:33 +0300
From:	Eduardo Valentin <eduardo.valentin@...ia.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org,
	Linux-OMAP <linux-omap@...r.kernel.org>
Cc:	Russell King <linux@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	ext Tony Lindgren <tony@...mide.com>,
	ext Kevin Hilman <khilman@...prootsystems.com>,
	Peter De-Schrijver <Peter.De-Schrijver@...ia.com>,
	santosh.shilimkar@...com, Ambresh <a0393775@...com>,
	felipe.balbi@...ia.com,
	Eduardo Valentin <eduardo.valentin@...ia.com>
Subject: [PATCHv4 0/4] Introduce the /proc/socinfo and use it to export OMAP data

Hello all,

Here is the patch set to export OMAP id code, production id and die id.
The history of this change is as follows:

1. First attempt tried adding those data under sysfs node. Original patch by
Peter De Schrijver [1]. Then, it was suggested to move it to debugfs, which was
rejected as this info is actually needed in production systems.

2. Then it has been moved to /proc/cpuinfo [2]. Then, it was suggested to do
not add this kind of info there, as it is not really CPU data.

Now, I'm sending this version which will introduce first the /proc/socinfo.
Then, following patches will add OMAP data into that node. And finally,
will add OMAP id, production and die id code.

Just for reference, I'm also pasting the previous 0/4 message:

-------------------------------------------------------------------------------
I'm resending this series with minor change in the subject prefix of patch 4/4.
Removed the PM: prefix. Everything else is same. So, I kept the v3 prefix as well.

v3:
And now v3 of this series. Basically a minor change wrt string manipulation.
No need to use strlen in so many places. Previous log for reference:

v2:

Here is the version 2 of this series. Now die id is protected using
same x86 protection mechanism to hide x86 product number. Besides,
a compilation Kconfig option has been added for DIE ID as well.

Here is previous PATCH 0/4 message:

v1:

This series is to continue what has been discussed several weeks ago
wrt IDCODE patch. Original patch was made by Peter and discussion is here:
http://www.mail-archive.com/linux-omap@vger.kernel.org/msg17553.html

So, the conclusion was that IDCODE info is useful even in production systems,
and for that debugfs is not a good choice to export it. One suggestion was to
add it under /proc/cpuinfo. However this entry nowadays exports only ARM related
information.

So this series does the trick by extending the ARM /proc/cpuinfo to include
soc info data. There are a few ways to add a hook for soc specific data. But
I've decided to implement it via the simplest way I found. Basically it is
same thing which is done for system_rev, system_serial_low and system_serial_high.
Then, now we have system_soc_info, which is printed only if there is something
useful there.

As usual, comments are welcome.

BR,

Eduardo Valentin (4):
  procfs: Introduce socinfo under /proc
  mach-omap2: export omap2 info under /proc/socinfo
  mach-omap1: export omap1 info under /proc/socinfo
  OMAP3: export chip IDCODE, Production ID and Die ID

 Documentation/filesystems/proc.txt  |    1 +
 Documentation/kernel-parameters.txt |    2 +
 arch/arm/Kconfig                    |    1 +
 arch/arm/mach-omap1/id.c            |   45 +++++++++++++++++---
 arch/arm/mach-omap2/Kconfig         |   10 ++++
 arch/arm/mach-omap2/id.c            |   81 ++++++++++++++++++++++++++++++++---
 fs/proc/Kconfig                     |    7 +++
 fs/proc/Makefile                    |    1 +
 fs/proc/socinfo.c                   |   33 ++++++++++++++
 9 files changed, 169 insertions(+), 12 deletions(-)
 create mode 100644 fs/proc/socinfo.c

-------------------------------------------------------------------------------
[1] - http://www.mail-archive.com/linux-omap@vger.kernel.org/msg17553.html
[2] - http://marc.info/?l=linux-omap&m=127304890312365&w=2

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