tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright 2010 Michael Ellerman, IBM Corporation
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#include <linux/kernel.h>
11#include <linux/of_platform.h>
12
13#include "wsp.h"
14
15/*
16 * Find chip-id by walking up device tree looking for ibm,wsp-chip-id property.
17 * Won't work for nodes that are not a descendant of a wsp node.
18 */
19int wsp_get_chip_id(struct device_node *dn)
20{
21 const u32 *p;
22 int rc;
23
24 /* Start looking at the specified node, not its parent */
25 dn = of_node_get(dn);
26 while (dn && !(p = of_get_property(dn, "ibm,wsp-chip-id", NULL)))
27 dn = of_get_next_parent(dn);
28
29 if (!dn)
30 return -1;
31
32 rc = *p;
33 of_node_put(dn);
34
35 return rc;
36}