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// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/property.h>
#include <asm/mpc5xxx.h>
/**
* mpc5xxx_fwnode_get_bus_frequency - Find the bus frequency for a firmware node
* @fwnode: firmware node
*
* Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
* or 0 if the bus frequency cannot be found.
*/
unsigned long mpc5xxx_fwnode_get_bus_frequency(struct fwnode_handle *fwnode)
{
struct fwnode_handle *parent;
u32 bus_freq;
int ret;
ret = fwnode_property_read_u32(fwnode, "bus-frequency", &bus_freq);
if (!ret)
return bus_freq;
fwnode_for_each_parent_node(fwnode, parent) {
ret = fwnode_property_read_u32(parent, "bus-frequency", &bus_freq);
if (!ret) {
fwnode_handle_put(parent);
return bus_freq;
}
}
return 0;
}
EXPORT_SYMBOL(mpc5xxx_fwnode_get_bus_frequency);
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