Linux 4.6-rc6
[linux/fpc-iii.git] / arch / powerpc / sysdev / mpc5xxx_clocks.c
blob573292663cf2ca9e688214d77ddac044bf83c402
1 /**
2 * mpc5xxx_get_bus_frequency - Find the bus frequency for a device
3 * @node: device node
5 * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
6 * or 0 if the bus frequency cannot be found.
7 */
9 #include <linux/kernel.h>
10 #include <linux/of_platform.h>
11 #include <linux/export.h>
12 #include <asm/mpc5xxx.h>
14 unsigned long mpc5xxx_get_bus_frequency(struct device_node *node)
16 const unsigned int *p_bus_freq = NULL;
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;
24 node = of_get_next_parent(node);
26 of_node_put(node);
28 return p_bus_freq ? *p_bus_freq : 0;
30 EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);