| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | |
| 3 | #include <linux/kernel.h> |
| 4 | #include <linux/export.h> |
| 5 | #include <linux/property.h> |
| 6 | |
| 7 | #include <asm/mpc5xxx.h> |
| 8 | |
| 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) |
| 17 | { |
| 18 | struct fwnode_handle *parent; |
| 19 | u32 bus_freq; |
| 20 | int ret; |
| 21 | |
| 22 | ret = fwnode_property_read_u32(fwnode, propname: "bus-frequency", val: &bus_freq); |
| 23 | if (!ret) |
| 24 | return bus_freq; |
| 25 | |
| 26 | fwnode_for_each_parent_node(fwnode, parent) { |
| 27 | ret = fwnode_property_read_u32(fwnode: parent, propname: "bus-frequency", val: &bus_freq); |
| 28 | if (!ret) { |
| 29 | fwnode_handle_put(fwnode: parent); |
| 30 | return bus_freq; |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | return 0; |
| 35 | } |
| 36 | EXPORT_SYMBOL(mpc5xxx_fwnode_get_bus_frequency); |
| 37 |