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> |
63410b0b | 12 | #include <asm/mpc5xxx.h> |
87c441e5 | 13 | |
63410b0b | 14 | unsigned long mpc5xxx_get_bus_frequency(struct device_node *node) |
87c441e5 | 15 | { |
87c441e5 WD |
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 | ||
b340587e | 24 | node = of_get_next_parent(node); |
87c441e5 | 25 | } |
756d3679 | 26 | of_node_put(node); |
87c441e5 WD |
27 | |
28 | return p_bus_freq ? *p_bus_freq : 0; | |
29 | } | |
30 | EXPORT_SYMBOL(mpc5xxx_get_bus_frequency); |