1// SPDX-License-Identifier: GPL-2.0
 
 
 
 
 
 
 2
 3#include <linux/kernel.h>
 
 4#include <linux/export.h>
 5#include <linux/property.h>
 6
 7#include <asm/mpc5xxx.h>
 8
 9/**
10 * mpc5xxx_fwnode_get_bus_frequency - Find the bus frequency for a firmware node
11 * @fwnode:	firmware node
12 *
13 * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
14 * or 0 if the bus frequency cannot be found.
15 */
16unsigned long mpc5xxx_fwnode_get_bus_frequency(struct fwnode_handle *fwnode)
17{
18	struct fwnode_handle *parent;
19	u32 bus_freq;
20	int ret;
21
22	ret = fwnode_property_read_u32(fwnode, "bus-frequency", &bus_freq);
23	if (!ret)
24		return bus_freq;
25
26	fwnode_for_each_parent_node(fwnode, parent) {
27		ret = fwnode_property_read_u32(parent, "bus-frequency", &bus_freq);
28		if (!ret) {
29			fwnode_handle_put(parent);
30			return bus_freq;
31		}
 
 
 
32	}
 
 
33
34	return 0;
35}
36EXPORT_SYMBOL(mpc5xxx_fwnode_get_bus_frequency);

 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>
11#include <linux/export.h>
 
 
 
12
13unsigned int
14mpc5xxx_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}
34EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);