| // SPDX-License-Identifier: GPL-2.0 |
| /** |
| * mpc5xxx_get_bus_frequency - Find the bus frequency for a device |
| * @node: device node |
| * |
| * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx), |
| * or 0 if the bus frequency cannot be found. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/of_platform.h> |
| #include <linux/export.h> |
| #include <asm/mpc5xxx.h> |
| |
| unsigned long mpc5xxx_get_bus_frequency(struct device_node *node) |
| { |
| const unsigned int *p_bus_freq = NULL; |
| |
| of_node_get(node); |
| while (node) { |
| p_bus_freq = of_get_property(node, "bus-frequency", NULL); |
| if (p_bus_freq) |
| break; |
| |
| node = of_get_next_parent(node); |
| } |
| of_node_put(node); |
| |
| return p_bus_freq ? *p_bus_freq : 0; |
| } |
| EXPORT_SYMBOL(mpc5xxx_get_bus_frequency); |
