162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci#include <linux/kernel.h> 462306a36Sopenharmony_ci#include <linux/export.h> 562306a36Sopenharmony_ci#include <linux/property.h> 662306a36Sopenharmony_ci 762306a36Sopenharmony_ci#include <asm/mpc5xxx.h> 862306a36Sopenharmony_ci 962306a36Sopenharmony_ci/** 1062306a36Sopenharmony_ci * mpc5xxx_fwnode_get_bus_frequency - Find the bus frequency for a firmware node 1162306a36Sopenharmony_ci * @fwnode: firmware node 1262306a36Sopenharmony_ci * 1362306a36Sopenharmony_ci * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx), 1462306a36Sopenharmony_ci * or 0 if the bus frequency cannot be found. 1562306a36Sopenharmony_ci */ 1662306a36Sopenharmony_ciunsigned long mpc5xxx_fwnode_get_bus_frequency(struct fwnode_handle *fwnode) 1762306a36Sopenharmony_ci{ 1862306a36Sopenharmony_ci struct fwnode_handle *parent; 1962306a36Sopenharmony_ci u32 bus_freq; 2062306a36Sopenharmony_ci int ret; 2162306a36Sopenharmony_ci 2262306a36Sopenharmony_ci ret = fwnode_property_read_u32(fwnode, "bus-frequency", &bus_freq); 2362306a36Sopenharmony_ci if (!ret) 2462306a36Sopenharmony_ci return bus_freq; 2562306a36Sopenharmony_ci 2662306a36Sopenharmony_ci fwnode_for_each_parent_node(fwnode, parent) { 2762306a36Sopenharmony_ci ret = fwnode_property_read_u32(parent, "bus-frequency", &bus_freq); 2862306a36Sopenharmony_ci if (!ret) { 2962306a36Sopenharmony_ci fwnode_handle_put(parent); 3062306a36Sopenharmony_ci return bus_freq; 3162306a36Sopenharmony_ci } 3262306a36Sopenharmony_ci } 3362306a36Sopenharmony_ci 3462306a36Sopenharmony_ci return 0; 3562306a36Sopenharmony_ci} 3662306a36Sopenharmony_ciEXPORT_SYMBOL(mpc5xxx_fwnode_get_bus_frequency); 37