1 // SPDX-License-Identifier: GPL-2.0 2 /** 3 * mpc5xxx_get_bus_frequency - Find the bus frequency for a device 4 * @node: device node 5 * 6 * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx), 7 * or 0 if the bus frequency cannot be found. 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/of_platform.h> 12 #include <linux/export.h> 13 #include <asm/mpc5xxx.h> 14 15 unsigned long mpc5xxx_get_bus_frequency(struct device_node *node) 16 { 17 const unsigned int *p_bus_freq = NULL; 18 19 of_node_get(node); 20 while (node) { 21 p_bus_freq = of_get_property(node, "bus-frequency", NULL); 22 if (p_bus_freq) 23 break; 24 25 node = of_get_next_parent(node); 26 } 27 of_node_put(node); 28 29 return p_bus_freq ? *p_bus_freq : 0; 30 } 31 EXPORT_SYMBOL(mpc5xxx_get_bus_frequency); 32