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https://github.com/edk2-porting/linux-next.git
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b496dfbc94
With a lot of devices booting from device tree nowadays, it requires that OPP table can be initialized from device tree. The patch adds a helper function of_init_opp_table together with a binding doc for that purpose. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
135 lines
2.9 KiB
C
135 lines
2.9 KiB
C
/*
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* Generic OPP Interface
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*
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* Copyright (C) 2009-2010 Texas Instruments Incorporated.
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* Nishanth Menon
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* Romit Dasgupta
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* Kevin Hilman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __LINUX_OPP_H__
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#define __LINUX_OPP_H__
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#include <linux/err.h>
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#include <linux/cpufreq.h>
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#include <linux/notifier.h>
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struct opp;
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struct device;
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enum opp_event {
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OPP_EVENT_ADD, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
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};
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#if defined(CONFIG_PM_OPP)
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unsigned long opp_get_voltage(struct opp *opp);
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unsigned long opp_get_freq(struct opp *opp);
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int opp_get_opp_count(struct device *dev);
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struct opp *opp_find_freq_exact(struct device *dev, unsigned long freq,
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bool available);
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struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq);
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struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq);
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int opp_add(struct device *dev, unsigned long freq, unsigned long u_volt);
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int opp_enable(struct device *dev, unsigned long freq);
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int opp_disable(struct device *dev, unsigned long freq);
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struct srcu_notifier_head *opp_get_notifier(struct device *dev);
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#ifdef CONFIG_OF
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int of_init_opp_table(struct device *dev);
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#else
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static inline int of_init_opp_table(struct device *dev)
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{
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return -EINVAL;
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}
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#endif /* CONFIG_OF */
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#else
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static inline unsigned long opp_get_voltage(struct opp *opp)
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{
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return 0;
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}
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static inline unsigned long opp_get_freq(struct opp *opp)
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{
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return 0;
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}
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static inline int opp_get_opp_count(struct device *dev)
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{
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return 0;
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}
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static inline struct opp *opp_find_freq_exact(struct device *dev,
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unsigned long freq, bool available)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline struct opp *opp_find_freq_floor(struct device *dev,
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unsigned long *freq)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline struct opp *opp_find_freq_ceil(struct device *dev,
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unsigned long *freq)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline int opp_add(struct device *dev, unsigned long freq,
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unsigned long u_volt)
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{
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return -EINVAL;
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}
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static inline int opp_enable(struct device *dev, unsigned long freq)
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{
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return 0;
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}
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static inline int opp_disable(struct device *dev, unsigned long freq)
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{
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return 0;
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}
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static inline struct srcu_notifier_head *opp_get_notifier(struct device *dev)
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{
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return ERR_PTR(-EINVAL);
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}
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#endif /* CONFIG_PM_OPP */
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#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
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int opp_init_cpufreq_table(struct device *dev,
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struct cpufreq_frequency_table **table);
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void opp_free_cpufreq_table(struct device *dev,
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struct cpufreq_frequency_table **table);
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#else
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static inline int opp_init_cpufreq_table(struct device *dev,
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struct cpufreq_frequency_table **table)
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{
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return -EINVAL;
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}
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static inline
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void opp_free_cpufreq_table(struct device *dev,
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struct cpufreq_frequency_table **table)
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{
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}
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#endif /* CONFIG_CPU_FREQ */
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#endif /* __LINUX_OPP_H__ */
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