tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
12unsigned int
13mpc5xxx_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}
33EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);