35 lines
759 B
C
35 lines
759 B
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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#include <asm/mpc5xxx.h>
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unsigned long 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);
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