On Tue, Sep 16, 2014 at 02:52:33PM +0300, Mika Westerberg wrote:

From: "Rafael J. Wysocki" <redacted>

Add a uniform interface by which device drivers can request device
properties from the platform firmware by providing a property name
and the corresponding data type.  The purpose of it is to help to
write portable code that won't depend on any particular platform
firmware interface.

Three general helper functions, device_get_property(),
device_read_property() and device_read_property_array() are provided.
The first one allows the raw value of a given device property to be
accessed by the driver.  The remaining two allow the value of a numeric
or string property and multiple numeric or string values of one array
property to be acquired, respectively.  Static inline wrappers are also
provided for the various property data types that can be passed to
device_read_property() or device_read_property_array() for extra type
checking.

In addition to that new generic routines are provided for retrieving
properties from device description objects in the platform firmware
in case there are no struct device objects for them (either those
objects have not been created yet or they do not exist at all).
Again, three functions are provided, dev_node_get_property(),
dev_node_read_property(), dev_node_read_property_array(), in analogy
with device_get_property(), device_read_property() and
device_read_property_array() described above, respectively, along
with static inline wrappers for all of the propery data types that
can be used.  For all of them, the first argument is a pointer to
struct fw_dev_node (new type) that in turn contains exactly one
valid pointer to a device description object (depending on what
platform firmware interface is in use).

Finally, device_for_each_child_node() is added for iterating over
the children of the device description object associated with the
given device.

The interface covers both ACPI and Device Trees.

This change set includes material from Mika Westerberg and Aaron Lu.

Signed-off-by: Aaron Lu <redacted>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <redacted>

Looks good to me, feel free to take this through your tree with my:

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>