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31 lines
731 B
31 lines
731 B
// SPDX-License-Identifier: GPL-2.0 |
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/** |
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* mpc5xxx_get_bus_frequency - Find the bus frequency for a device |
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* @node: device 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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#include <linux/kernel.h> |
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#include <linux/of_platform.h> |
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#include <linux/export.h> |
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#include <asm/mpc5xxx.h> |
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unsigned long mpc5xxx_get_bus_frequency(struct device_node *node) |
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{ |
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const unsigned int *p_bus_freq = NULL; |
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of_node_get(node); |
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while (node) { |
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p_bus_freq = of_get_property(node, "bus-frequency", NULL); |
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if (p_bus_freq) |
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break; |
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node = of_get_next_parent(node); |
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} |
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of_node_put(node); |
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return p_bus_freq ? *p_bus_freq : 0; |
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} |
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EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);
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