WSL2-Linux-Kernel/Documentation/ABI/stable
Benjamin Herrenschmidt 5590f3196b drivers/core/of: Add symlink to device-tree from devices with an OF node
So I've been annoyed lately with having a bunch of devices such as i2c
eeproms (for use by VPDs, server world !) and other bits and pieces that
I want to be able to identify from userspace, and possibly provide
additional data about from FW.

Basically, it boils down to correlating the sysfs device with the OF
tree device node, so that user space can use device-tree info such as
additional "location" or "label" (or whatever else we can come up with)
propreties to identify a given device, or get some attributes of use
about it, etc...

Now, so far, we've done that in some subsystem in a fairly ad-hoc basis
using "devspec" properties. For example, PCI creates them if it can
correlate the probed device with a DT node. Some powerpc specific busses
do that too.

However, i2c doesn't and it would be nice to have something more generic
since technically any device can have a corresponding device tree node.

This patch adds an "of_node" symlink to devices that have a non-NULL
dev->of_node pointer, the patch is pretty trivial and seems to work just
fine for me.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-03-25 14:56:58 +01:00
..
firewire-cdev firewire: cdev: ABI documentation enhancements 2011-07-16 07:24:32 +02:00
o2cb ocfs2: Move /sys/o2cb to /sys/fs/o2cb 2008-04-18 08:56:10 -07:00
syscalls [PATCH] Add kernel<->userspace ABI stability documentation 2006-06-21 12:40:47 -07:00
sysfs-acpi-pmprofile ACPI: Export FADT pm_profile integer value to userspace 2011-11-06 20:48:42 -05:00
sysfs-bus-firewire firewire: core: document is_local sysfs attribute 2012-06-30 10:49:06 +02:00
sysfs-bus-usb USB / PM: Drop CONFIG_PM_RUNTIME from the USB core 2014-12-04 00:51:54 +01:00
sysfs-bus-xen-backend xen: document backend sysfs files 2011-11-11 15:37:29 -05:00
sysfs-class-backlight backlight: add backlight type 2011-03-22 17:43:59 -07:00
sysfs-class-rfkill rename new rfkill sysfs knobs 2010-03-19 15:48:25 -04:00
sysfs-class-tpm tpm: device class for tpm 2015-01-17 14:00:10 +01:00
sysfs-class-ubi Documentation: add UBI sysfs ABI docs 2008-04-17 11:31:57 +03:00
sysfs-class-udc usb: gadget: udc: document our sysfs ABI 2014-11-03 10:01:00 -06:00
sysfs-devices drivers/core/of: Add symlink to device-tree from devices with an OF node 2015-03-25 14:56:58 +01:00
sysfs-devices-node mm: remove noisy remainder of the scan_unevictable interface 2014-10-09 22:25:55 -04:00
sysfs-devices-system-cpu powerpc: Document sysfs DSCR interface 2014-05-28 13:35:40 +10:00
sysfs-devices-system-xen_memory xen: document balloon driver sysfs files 2011-11-09 16:00:46 -05:00
sysfs-driver-ib_srp IB/srp: Add multichannel support 2014-11-12 12:05:24 +01:00
sysfs-driver-qla2xxx [SCSI] qla2xxx: Add firmware-dump kobject uevent notification. 2009-12-04 12:00:10 -06:00
sysfs-driver-usb-usbtmc USB: update usbtmc api documentation 2012-04-12 08:26:22 -07:00
sysfs-driver-w1_ds28e04 w1: Add 1-wire slave device driver for DS28E04-100 2012-06-13 16:47:10 -07:00
sysfs-firmware-efi-vars efivars: Add Documentation 2011-03-14 08:40:51 -07:00
sysfs-firmware-opal-dump powerpc/powernv Platform dump interface 2014-03-07 16:19:10 +11:00
sysfs-firmware-opal-elog powerpc/powernv: Read OPAL error log and export it through sysfs 2014-03-07 16:19:00 +11:00
sysfs-module ABI: Clarify when /sys/module/MODULENAME is created 2013-07-02 15:38:20 +09:30
sysfs-transport-srp scsi_transport_srp: Add periodic reconnect support 2013-11-08 14:43:16 -08:00
thermal-notification thermal: Add event notification to thermal framework 2011-01-12 00:08:35 -05:00
vdso Documentation: Add newline at end-of-file to files lacking one 2012-07-20 23:10:28 +02:00