From: greg@kroah.com (Greg KH)
Date: Fri, 11 Mar 2011 07:52:57 -0800
Subject: [RFC PATCHv2 1/2] Export SoC info through sysfs
In-Reply-To: <201103111532.52393.arnd@arndb.de>
References: <1299846911-15782-1-git-send-email-maxime.coquelin-nonst@stericsson.com>
	<1299846911-15782-2-git-send-email-maxime.coquelin-nonst@stericsson.com>
	<201103111532.52393.arnd@arndb.de>
Message-ID: <20110311155257.GA6711@kroah.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Fri, Mar 11, 2011 at 03:32:51PM +0100, Arnd Bergmann wrote:
> On Friday 11 March 2011, Maxime Coquelin wrote:
> > Common base to export System-on-Chip related informations through sysfs.
> > 
> > Creation of a "socinfo" directory under /sys/.
> > Creation of SoC information entries.
> > 
> > Signed-off-by: Maxime COQUELIN <maxime.coquelin-nonst@stericsson.com>
> 
> I think it's better than the previous patch to create an
> artificial device in /sys/devices/system/socinfo, but I'd
> still prefer the information to be attached to a real device
> that represents the SOC, as I explained in the discussion with
> Linus Walleij.
> 
> You should definitely add Greg on Cc, as he's maintaining sysfs
> and certainly has an opininion here.
> 
> 	Arnd
> 
> > ---
> >  Documentation/ABI/testing/sysfs-socinfo |   16 ++++++
> >  drivers/base/Kconfig                    |    3 +
> >  drivers/base/Makefile                   |    1 +
> >  drivers/base/soc.c                      |   79 +++++++++++++++++++++++++++++++
> >  include/linux/sys_soc.h                 |   50 +++++++++++++++++++
> >  5 files changed, 149 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
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-socinfo b/Documentation/ABI/testing/sysfs-socinfo
> > new file mode 100644
> > index 0000000..afd9da2
> > --- /dev/null
> > +++ b/Documentation/ABI/testing/sysfs-socinfo
> > @@ -0,0 +1,16 @@
> > +What:		/sys/socinfo
> > +Date:		March 2011
> > +contact:	Maxime Coquelin <maxime.coquelin-nonst@stericsson.com>
> > +Description:
> > +		The /sys/socinfo directory contains information about the
> > +		System-on-Chip.	It is only available if platform implements it.
> > +		This directory contains two kind of attributes :
> > +			- common attributes: 
> > +				* machine: the name of the machine.
> > +				* family: the family name of the SoC
> > +			- SoC-specific attributes: The SoC vendor can declare attributes
> > +			  to export some strings to user-space, like the serial-number for
> > +			  example.
> > +
> > +Users:
> > +		User-space applications which needs these kind of attributes.

I thought I rejected this the last time it came around?

I still fail to understand why this is needed, please provide more
information about why you feel this is something that the kernel needs.

thanks,

greg k-h