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 
12 unsigned int
mpc5xxx_get_bus_frequency(struct device_node * node)13 mpc5xxx_get_bus_frequency(struct device_node *node)
14 {
15 	struct device_node *np;
16 	const unsigned int *p_bus_freq = NULL;
17 
18 	of_node_get(node);
19 	while (node) {
20 		p_bus_freq = of_get_property(node, "bus-frequency", NULL);
21 		if (p_bus_freq)
22 			break;
23 
24 		np = of_get_parent(node);
25 		of_node_put(node);
26 		node = np;
27 	}
28 	if (node)
29 		of_node_put(node);
30 
31 	return p_bus_freq ? *p_bus_freq : 0;
32 }
33 EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);
34