blob: 11ac2f05e01c72a1d9c8874a8020f7eb0947aedc [file] [log] [blame]
* 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;
return rc;