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Viewing changes to arch/powerpc/sysdev/mpc5xxx_clocks.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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arch/powerpc/sysdev/mpc5xxx_clocks.c
 
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/**
 
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 *      mpc5xxx_get_bus_frequency - Find the bus frequency for a device
 
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 *      @node:  device node
 
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 *
 
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 *      Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
 
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 *      or 0 if the bus frequency cannot be found.
 
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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 <linux/export.h>
 
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unsigned int
 
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mpc5xxx_get_bus_frequency(struct device_node *node)
 
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{
 
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        struct device_node *np;
 
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        const unsigned int *p_bus_freq = NULL;
 
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        of_node_get(node);
 
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        while (node) {
 
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                p_bus_freq = of_get_property(node, "bus-frequency", NULL);
 
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                if (p_bus_freq)
 
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                        break;
 
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                np = of_get_parent(node);
 
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                of_node_put(node);
 
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                node = np;
 
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        }
 
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        if (node)
 
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                of_node_put(node);
 
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        return p_bus_freq ? *p_bus_freq : 0;
 
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}
 
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EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);