linux-kernel - [PATCH 0/2] of: Create sysfs view of device tree nodes

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Date:	Wed, 20 Mar 2013 14:51:12 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org
Subject: [PATCH 0/2] of: Create sysfs view of device tree nodes

Hi all,

This series reworks the device tree userspace view to be exposed via
sysfs. I've been wanting to move to using kobjects to manage the device
tree for a while now. It results in less code overall, and it gives us
the userspace view "for free".

The first patch converts the device_nodes into kobjects and registers
them under /sys/firmware/ofw/device-tree. The second removes the old
/proc/device-tree support code and replaces it with a symlink from
/proc/device-tree to the sysfs view.

I attempted to also remove the virtual /proc/openprom filesystem, but
unfortunately /proc/devicetree and /proc/openprom use different
semantics. In /proc/devicetree the properties are exposed as raw
binaries, but in /proc/openprom the properties are all converted into
ascii string representation first.

I've tested this series on ARM and embedded powerpc. I have build tested
on SPARC and x86. Dave, I'm particularly interested to know how well
this runs on SPARC. I think I've got it right, but I haven't tested the
changes to the driver/of/pdt.c code.

g.

 Documentation/ABI/testing/sysfs-firmware-ofw |   28 ++++++
 drivers/of/Kconfig                           |   10 +-
 drivers/of/base.c                            |  180 +++++++++++++++++++++++-------------
 drivers/of/fdt.c                             |    3 +-
 drivers/of/pdt.c                             |    4 +-
 fs/proc/Makefile                             |    1 -
 fs/proc/proc_devtree.c                       |  243 -------------------------------------------------
 fs/proc/root.c                               |    3 -
 include/linux/of.h                           |   10 +-
 include/linux/proc_fs.h                      |   16 ----
 10 files changed, 156 insertions(+), 342 deletions(-)

[PATCH 1/2] of: Make device nodes kobjects so they show up in sysfs
[PATCH 2/2] of: remove /proc/device-tree
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