On Wed, Oct 01, 2014 at 04:10:03AM +0200, Rafael J. Wysocki wrote: > From: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx> > > 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. 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 a device driver needs/wants to access properties of a child > object of a given device object. There are cases in which there is > no struct device representation of such child objects and this > additional API is useful then. Again, three functions are provided, > device_get_child_property(), device_read_child_property(), > device_read_child_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 struct device pointer to the parent device object and the second > argument is a (void *) pointer to the child description provided by > the platform firmware (either ACPI or FDT). > > Finally, device_for_each_child_node() is added for iterating over > the children of the device description object associated with a > 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 <aaron.lu@xxxxxxxxx> > Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > --- > > Greg, please let me know if you're fine with this one. Looks good to me: Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
