Commit | Line | Data |
---|---|---|
87c441e5 WD |
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 | |
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); |