| // SPDX-License-Identifier: GPL-2.0 |
| |
| #include <linux/kernel.h> |
| #include <linux/export.h> |
| #include <linux/property.h> |
| |
| #include <asm/mpc5xxx.h> |
| |
| /** |
| * mpc5xxx_fwnode_get_bus_frequency - Find the bus frequency for a firmware node |
| * @fwnode: firmware node |
| * |
| * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx), |
| * or 0 if the bus frequency cannot be found. |
| */ |
| unsigned long mpc5xxx_fwnode_get_bus_frequency(struct fwnode_handle *fwnode) |
| { |
| struct fwnode_handle *parent; |
| u32 bus_freq; |
| int ret; |
| |
| ret = fwnode_property_read_u32(fwnode, "bus-frequency", &bus_freq); |
| if (!ret) |
| return bus_freq; |
| |
| fwnode_for_each_parent_node(fwnode, parent) { |
| ret = fwnode_property_read_u32(parent, "bus-frequency", &bus_freq); |
| if (!ret) |
| return bus_freq; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mpc5xxx_fwnode_get_bus_frequency); |
