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