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