Commit | Line | Data |
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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> | |
66b15db6 | 11 | #include <linux/export.h> |
87c441e5 WD |
12 | |
13 | unsigned int | |
14 | mpc5xxx_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 | } | |
34 | EXPORT_SYMBOL(mpc5xxx_get_bus_frequency); |