[deliverable/linux.git] / arch / powerpc / sysdev / mpc5xxx_clocks.c

/**
 * 	mpc5xxx_get_bus_frequency - Find the bus frequency for a device
 * 	@node:	device node
 *
 * 	Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
 * 	or 0 if the bus frequency cannot be found.
 */

#include <linux/kernel.h>
#include <linux/of_platform.h>
#include <linux/export.h>

unsigned int
mpc5xxx_get_bus_frequency(struct device_node *node)
{
	struct device_node *np;
	const unsigned int *p_bus_freq = NULL;

	of_node_get(node);
	while (node) {
		p_bus_freq = of_get_property(node, "bus-frequency", NULL);
		if (p_bus_freq)
			break;

		np = of_get_parent(node);
		of_node_put(node);
		node = np;
	}
	if (node)
		of_node_put(node);

	return p_bus_freq ? *p_bus_freq : 0;
}
EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);
Commit	Line	Data
87c441e5 WD	1	/**
	2	* mpc5xxx_get_bus_frequency - Find the bus frequency for a device
	3	* @node: device node
	4	*
	5	* Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
	6	* or 0 if the bus frequency cannot be found.
	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/of_platform.h>
66b15db6	11	#include <linux/export.h>
87c441e5 WD	12
	13	unsigned int
	14	mpc5xxx_get_bus_frequency(struct device_node *node)
	15	{
	16	struct device_node *np;
	17	const unsigned int *p_bus_freq = NULL;
	18
	19	of_node_get(node);
	20	while (node) {
	21	p_bus_freq = of_get_property(node, "bus-frequency", NULL);
	22	if (p_bus_freq)
	23	break;
	24
	25	np = of_get_parent(node);
	26	of_node_put(node);
	27	node = np;
	28	}
	29	if (node)
	30	of_node_put(node);
	31
	32	return p_bus_freq ? *p_bus_freq : 0;
	33	}
	34	EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);