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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
87c441e5 WD |
2 | |
3 | #include <linux/kernel.h> | |
66b15db6 | 4 | #include <linux/export.h> |
de06fba6 AS |
5 | #include <linux/property.h> |
6 | ||
63410b0b | 7 | #include <asm/mpc5xxx.h> |
87c441e5 | 8 | |
de06fba6 AS |
9 | /** |
10 | * mpc5xxx_fwnode_get_bus_frequency - Find the bus frequency for a firmware node | |
11 | * @fwnode: firmware node | |
12 | * | |
13 | * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx), | |
14 | * or 0 if the bus frequency cannot be found. | |
15 | */ | |
16 | unsigned long mpc5xxx_fwnode_get_bus_frequency(struct fwnode_handle *fwnode) | |
87c441e5 | 17 | { |
de06fba6 AS |
18 | struct fwnode_handle *parent; |
19 | u32 bus_freq; | |
20 | int ret; | |
87c441e5 | 21 | |
de06fba6 AS |
22 | ret = fwnode_property_read_u32(fwnode, "bus-frequency", &bus_freq); |
23 | if (!ret) | |
24 | return bus_freq; | |
87c441e5 | 25 | |
de06fba6 AS |
26 | fwnode_for_each_parent_node(fwnode, parent) { |
27 | ret = fwnode_property_read_u32(parent, "bus-frequency", &bus_freq); | |
28 | if (!ret) | |
29 | return bus_freq; | |
87c441e5 | 30 | } |
87c441e5 | 31 | |
de06fba6 | 32 | return 0; |
87c441e5 | 33 | } |
de06fba6 | 34 | EXPORT_SYMBOL(mpc5xxx_fwnode_get_bus_frequency); |