M7350/kernel/arch/powerpc/sysdev/mpc5xxx_clocks.c

35 lines
759 B
C
Raw Permalink Normal View History

2024-09-09 08:52:07 +00:00
/**
* 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>
2024-09-09 08:57:42 +00:00
#include <asm/mpc5xxx.h>
2024-09-09 08:52:07 +00:00
2024-09-09 08:57:42 +00:00
unsigned long mpc5xxx_get_bus_frequency(struct device_node *node)
2024-09-09 08:52:07 +00:00
{
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);