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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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62b5848f73
Instead of using 0 and 1 as magic numbers, let's add proper defines whose names tell the reader what the meaning behind them is. Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Link: https://lore.kernel.org/r/20250624-pwrseq-match-defines-v1-3-a59d90a951f1@linaro.org Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2024 Linaro Ltd.
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*/
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#ifndef __POWER_SEQUENCING_PROVIDER_H__
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#define __POWER_SEQUENCING_PROVIDER_H__
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struct device;
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struct module;
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struct pwrseq_device;
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typedef int (*pwrseq_power_state_func)(struct pwrseq_device *);
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typedef int (*pwrseq_match_func)(struct pwrseq_device *, struct device *);
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#define PWRSEQ_NO_MATCH 0
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#define PWRSEQ_MATCH_OK 1
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/**
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* struct pwrseq_unit_data - Configuration of a single power sequencing
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* unit.
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* @name: Name of the unit.
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* @deps: Units that must be enabled before this one and disabled after it
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* in the order they come in this array. Must be NULL-terminated.
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* @enable: Callback running the part of the power-on sequence provided by
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* this unit.
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* @disable: Callback running the part of the power-off sequence provided
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* by this unit.
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*/
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struct pwrseq_unit_data {
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const char *name;
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const struct pwrseq_unit_data **deps;
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pwrseq_power_state_func enable;
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pwrseq_power_state_func disable;
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};
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/**
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* struct pwrseq_target_data - Configuration of a power sequencing target.
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* @name: Name of the target.
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* @unit: Final unit that this target must reach in order to be considered
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* enabled.
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* @post_enable: Callback run after the target unit has been enabled, *after*
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* the state lock has been released. It's useful for implementing
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* boot-up delays without blocking other users from powering up
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* using the same power sequencer.
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*/
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struct pwrseq_target_data {
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const char *name;
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const struct pwrseq_unit_data *unit;
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pwrseq_power_state_func post_enable;
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};
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/**
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* struct pwrseq_config - Configuration used for registering a new provider.
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* @parent: Parent device for the sequencer. Must be set.
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* @owner: Module providing this device.
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* @drvdata: Private driver data.
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* @match: Provider callback used to match the consumer device to the sequencer.
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* @targets: Array of targets for this power sequencer. Must be NULL-terminated.
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*/
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struct pwrseq_config {
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struct device *parent;
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struct module *owner;
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void *drvdata;
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pwrseq_match_func match;
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const struct pwrseq_target_data **targets;
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};
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struct pwrseq_device *
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pwrseq_device_register(const struct pwrseq_config *config);
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void pwrseq_device_unregister(struct pwrseq_device *pwrseq);
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struct pwrseq_device *
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devm_pwrseq_device_register(struct device *dev,
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const struct pwrseq_config *config);
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void *pwrseq_device_get_drvdata(struct pwrseq_device *pwrseq);
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#endif /* __POWER_SEQUENCING_PROVIDER_H__ */
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