linux-kernel - [RFC PATCHv2 0/2] Export SoC info through sysfs

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Date:	Fri, 11 Mar 2011 13:35:09 +0100
From:	Maxime Coquelin <maxime.coquelin-nonst@...ricsson.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"eduardo.valentin@...ia.com" <eduardo.valentin@...ia.com>,
	Saravana Kannan <skannan@...eaurora.org>,
	Ryan Mallon <ryan@...ewatersys.com>,
	Linus Walleij <linus.walleij@...aro.org>
Cc:	<maxime_coquelin@...oo.fr>, ext Nishanth Menon <nm@...com>,
	ext Tony Lindgren <tony@...mide.com>,
	Peter De-Schrijver <Peter.De-Schrijver@...ia.com>,
	Ambresh <a0393775@...com>,
	Jouni Hogander <jouni.hogander@...ia.com>,
	Lee Jones <Lee.Jones@...aro.org>,
	Rabin VINCENT <rabin.vincent@...ricsson.com>,
	Russell King <linux@....linux.org.uk>,
	Jonas ABERG <jonas.aberg@...ricsson.com>,
	ext Kevin Hilman <khilman@...prootsystems.com>,
	David Brown <davidb@...eaurora.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	Loic PALLARDY <loic.pallardy@...ricsson.com>,
	Linux-OMAP <linux-omap@...r.kernel.org>,
	Daniel Walker <dwalker@...eaurora.org>,
	Andrei Warkentin <andreiw@...orola.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	"santosh.shilimkar@...com" <santosh.shilimkar@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Maxime Coquelin <maxime.coquelin-nonst@...ricsson.com>
Subject: [RFC PATCHv2 0/2] Export SoC info through sysfs

Here is the second version of the proposal to export SoC related information to user-space through sysFS interface.

The first patch introduces the common part, which provides an interface to the platform to export platform-defined IDs to user-space.
The IDs strings can be provided in two ways: either with a pointer to the string, or by a callback fullfilling the sysfs's "show" callback buffer.

The second patch is given as example for the ux500 architecture. It registers the socinfo interface, and exports 5 values (Family name, machine name, silicon process, silicon revision, and serial number).

Here is the output for DB8500:
root@ME:/sys/socinfo ls -l
-r--r--r-- 1 root root 4096 Jan  2 03:35 family
-r--r--r-- 1 root root 4096 Jan  2 03:35 machine
-r--r--r-- 1 root root 4096 Jan  2 03:35 process
-r--r--r-- 1 root root 4096 Jan  2 03:35 revision
-r--r--r-- 1 root root 4096 Jan  2 03:35 soc_id
root@ME:/sys/socinfo cat machine
DB8500
root@ME:/sys/socinfo cat family
Ux500
root@ME:/sys/socinfo cat process
Standard
root@ME:/sys/socinfo cat revision
2.0
root@ME:/sys/socinfo cat soc_id
2ba07ce9e5835d6185321e9577462ef2ea2129cf

-------------------------------------------------------------------------------
v1:
	Conclusion about first version :
		* /sys/devices/system is not right place for this interface.
		* "mach_name" should be declared as other attributes to simplify code.
		* The get_info callback should use directly the "show" callback buffer.
		* Documentation was missing (ABI description required)
		* Errors were not reported at registration time.
		* Macros should be used to create attributes.
		* Some kernel coding rules not followed.

-------------------------------------------------------------------------------

Any comments are welcome.

Note that I will be off from 13th to 21th of March.

Regards,
Maxime

-------------------------------------------------------------------------------

Maxime Coquelin (2):
  Export SoC info through sysfs
  ux500: Export U8500 SoC info through sysfs

 Documentation/ABI/testing/sysfs-socinfo |   16 ++++++
 arch/arm/mach-ux500/Kconfig             |    1 +
 arch/arm/mach-ux500/id.c                |   70 +++++++++++++++++++++++++++
 drivers/base/Kconfig                    |    3 +
 drivers/base/Makefile                   |    1 +
 drivers/base/soc.c                      |   79 +++++++++++++++++++++++++++++++
 include/linux/sys_soc.h                 |   50 +++++++++++++++++++
 7 files changed, 220 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-socinfo
 create mode 100644 drivers/base/soc.c
 create mode 100644 include/linux/sys_soc.h

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