| /* |
| * Copyright 2010 Michael Ellerman, IBM Corporation |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/of_platform.h> |
| |
| #include "wsp.h" |
| |
| /* |
| * Find chip-id by walking up device tree looking for ibm,wsp-chip-id property. |
| * Won't work for nodes that are not a descendant of a wsp node. |
| */ |
| int wsp_get_chip_id(struct device_node *dn) |
| { |
| const u32 *p; |
| int rc; |
| |
| /* Start looking at the specified node, not its parent */ |
| dn = of_node_get(dn); |
| while (dn && !(p = of_get_property(dn, "ibm,wsp-chip-id", NULL))) |
| dn = of_get_next_parent(dn); |
| |
| if (!dn) |
| return -1; |
| |
| rc = *p; |
| of_node_put(dn); |
| |
| return rc; |
| } |
