linux/arch/powerpc/sysdev/mpc5xxx_clocks.c
Wolfgang Denk 87c441e54d powerpc/5xxx: Add common mpc5xxx_get_bus_frequency() function
So far, MPC512x used mpc512x_find_ips_freq() to get the bus frequency,
while MPC52xx used mpc52xx_find_ipb_freq().  Despite the different
clock names (IPS vs. IPB) the code was identical.

Use common code for both processor families.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-06-17 00:30:22 -06:00

33 lines
707 B
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>
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);