Boolean properties are defined as being properties with no content, that are true if present and false if absent. They pose a problem for DT overlays, since the proposed (and widely used) overlay mechanism does not allow for properties (or nodes) to be deleted; overlays can only make a false property true, so boolean properties are effectively monostable - once true they become immutable. The standard DT syntax includes /delete-property/ and /delete-node/ directives that do what you would expect from their names, but that facility is not available to overlays. There is no FDT node that represents the deletion - the directives are acted on immediately - so we would need some extra markup - say __delete_property__ and __delete_node__ - to hold the names of items to be deleted. Before I take this further, does anybody have any thoughts on the idea? Phil -- 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
