1 // SPDX-License-Identifier: GPL-2.0
2 /**
3  * 	mpc5xxx_get_bus_frequency - Find the bus frequency for a device
4  * 	@node:	device node
5  *
6  * 	Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
7  * 	or 0 if the bus frequency cannot be found.
8  */
9 
10 #include <linux/kernel.h>
11 #include <linux/of_platform.h>
12 #include <linux/export.h>
13 #include <asm/mpc5xxx.h>
14 
15 unsigned long mpc5xxx_get_bus_frequency(struct device_node *node)
16 {
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 		node = of_get_next_parent(node);
26 	}
27 	of_node_put(node);
28 
29 	return p_bus_freq ? *p_bus_freq : 0;
30 }
31 EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);
32