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PM / Runtime: Update document about callbacks
Support for device power domains has been introduced in
commit 9659cc0678
(PM: Make
system-wide PM and runtime PM treat subsystems consistently),
also power domain callbacks will take precedence over subsystem ones
from commit 4d27e9dcff00a6425d779b065ec8892e4f391661(PM: Make
power domain callbacks take precedence over subsystem ones).
So update part of "Device Runtime PM Callbacks" in
Documentation/power/runtime_pm.txt.
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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@ -43,13 +43,18 @@ struct dev_pm_ops {
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...
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};
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The ->runtime_suspend(), ->runtime_resume() and ->runtime_idle() callbacks are
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executed by the PM core for either the device type, or the class (if the device
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type's struct dev_pm_ops object does not exist), or the bus type (if the
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device type's and class' struct dev_pm_ops objects do not exist) of the given
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device (this allows device types to override callbacks provided by bus types or
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classes if necessary). The bus type, device type and class callbacks are
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referred to as subsystem-level callbacks in what follows.
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The ->runtime_suspend(), ->runtime_resume() and ->runtime_idle() callbacks
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are executed by the PM core for either the power domain, or the device type
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(if the device power domain's struct dev_pm_ops does not exist), or the class
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(if the device power domain's and type's struct dev_pm_ops object does not
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exist), or the bus type (if the device power domain's, type's and class'
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struct dev_pm_ops objects do not exist) of the given device, so the priority
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order of callbacks from high to low is that power domain callbacks, device
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type callbacks, class callbacks and bus type callbacks, and the high priority
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one will take precedence over low priority one. The bus type, device type and
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class callbacks are referred to as subsystem-level callbacks in what follows,
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and generally speaking, the power domain callbacks are used for representing
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power domains within a SoC.
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By default, the callbacks are always invoked in process context with interrupts
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enabled. However, subsystems can use the pm_runtime_irq_safe() helper function
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