• Benjamin Herrenschmidt's avatar
    drivers/core/of: Add symlink to device-tree from devices with an OF node · 5590f319
    Benjamin Herrenschmidt authored
    
    
    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: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    Acked-by: default avatarRob Herring <robh@kernel.org>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    5590f319