853116a105
Based on previous LKML discussions: * Update docs for regulator sysfs class attributes to highlight the fact that all current attributes are intended to be control inputs, including notably "state" and "opmode" which previously implied otherwise. * Define a new regulator driver get_status() method, which is the first method reporting regulator outputs instead of inputs. It can report on/off and error status; or instead of simply "on", report the actual operating mode. For the moment, this is a sysfs-only interface, not accessible to regulator clients. Such clients can use the current notification interfaces to detect errors, if the regulator reports them. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
351 lines
11 KiB
Text
351 lines
11 KiB
Text
What: /sys/class/regulator/.../state
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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state. This reports the regulator enable control, for
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regulators which can report that input value.
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This will be one of the following strings:
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'enabled'
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'disabled'
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'unknown'
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'enabled' means the regulator output is ON and is supplying
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power to the system (assuming no error prevents it).
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'disabled' means the regulator output is OFF and is not
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supplying power to the system (unless some non-Linux
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control has enabled it).
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'unknown' means software cannot determine the state, or
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the reported state is invalid.
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NOTE: this field can be used in conjunction with microvolts
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or microamps to determine configured regulator output levels.
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What: /sys/class/regulator/.../status
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Description:
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Some regulator directories will contain a field called
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"status". This reports the current regulator status, for
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regulators which can report that output value.
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This will be one of the following strings:
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off
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on
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error
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fast
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normal
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idle
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standby
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"off" means the regulator is not supplying power to the
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system.
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"on" means the regulator is supplying power to the system,
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and the regulator can't report a detailed operation mode.
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"error" indicates an out-of-regulation status such as being
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disabled due to thermal shutdown, or voltage being unstable
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because of problems with the input power supply.
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"fast", "normal", "idle", and "standby" are all detailed
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regulator operation modes (described elsewhere). They
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imply "on", but provide more detail.
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Note that regulator status is a function of many inputs,
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not limited to control inputs from Linux. For example,
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the actual load presented may trigger "error" status; or
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a regulator may be enabled by another user, even though
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Linux did not enable it.
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What: /sys/class/regulator/.../type
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Each regulator directory will contain a field called
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type. This holds the regulator type.
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This will be one of the following strings:
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'voltage'
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'current'
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'unknown'
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'voltage' means the regulator output voltage can be controlled
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by software.
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'current' means the regulator output current limit can be
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controlled by software.
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'unknown' means software cannot control either voltage or
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current limit.
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What: /sys/class/regulator/.../microvolts
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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microvolts. This holds the regulator output voltage setting
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measured in microvolts (i.e. E-6 Volts), for regulators
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which can report the control input for voltage.
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NOTE: This value should not be used to determine the regulator
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output voltage level as this value is the same regardless of
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whether the regulator is enabled or disabled.
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What: /sys/class/regulator/.../microamps
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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microamps. This holds the regulator output current limit
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setting measured in microamps (i.e. E-6 Amps), for regulators
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which can report the control input for a current limit.
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NOTE: This value should not be used to determine the regulator
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output current level as this value is the same regardless of
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whether the regulator is enabled or disabled.
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What: /sys/class/regulator/.../opmode
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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opmode. This holds the current regulator operating mode,
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for regulators which can report that control input value.
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The opmode value can be one of the following strings:
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'fast'
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'normal'
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'idle'
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'standby'
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'unknown'
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The modes are described in include/linux/regulator/consumer.h
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NOTE: This value should not be used to determine the regulator
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output operating mode as this value is the same regardless of
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whether the regulator is enabled or disabled. A "status"
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attribute may be available to determine the actual mode.
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What: /sys/class/regulator/.../min_microvolts
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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min_microvolts. This holds the minimum safe working regulator
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output voltage setting for this domain measured in microvolts,
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for regulators which support voltage constraints.
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NOTE: this will return the string 'constraint not defined' if
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the power domain has no min microvolts constraint defined by
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platform code.
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What: /sys/class/regulator/.../max_microvolts
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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max_microvolts. This holds the maximum safe working regulator
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output voltage setting for this domain measured in microvolts,
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for regulators which support voltage constraints.
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NOTE: this will return the string 'constraint not defined' if
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the power domain has no max microvolts constraint defined by
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platform code.
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What: /sys/class/regulator/.../min_microamps
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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min_microamps. This holds the minimum safe working regulator
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output current limit setting for this domain measured in
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microamps, for regulators which support current constraints.
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NOTE: this will return the string 'constraint not defined' if
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the power domain has no min microamps constraint defined by
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platform code.
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What: /sys/class/regulator/.../max_microamps
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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max_microamps. This holds the maximum safe working regulator
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output current limit setting for this domain measured in
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microamps, for regulators which support current constraints.
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NOTE: this will return the string 'constraint not defined' if
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the power domain has no max microamps constraint defined by
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platform code.
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What: /sys/class/regulator/.../name
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Date: October 2008
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KernelVersion: 2.6.28
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Each regulator directory will contain a field called
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name. This holds a string identifying the regulator for
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display purposes.
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NOTE: this will be empty if no suitable name is provided
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by platform or regulator drivers.
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What: /sys/class/regulator/.../num_users
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Each regulator directory will contain a field called
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num_users. This holds the number of consumer devices that
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have called regulator_enable() on this regulator.
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What: /sys/class/regulator/.../requested_microamps
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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requested_microamps. This holds the total requested load
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current in microamps for this regulator from all its consumer
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devices.
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What: /sys/class/regulator/.../parent
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Date: April 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a link called parent.
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This points to the parent or supply regulator if one exists.
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What: /sys/class/regulator/.../suspend_mem_microvolts
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Date: May 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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suspend_mem_microvolts. This holds the regulator output
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voltage setting for this domain measured in microvolts when
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the system is suspended to memory, for voltage regulators
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implementing suspend voltage configuration constraints.
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What: /sys/class/regulator/.../suspend_disk_microvolts
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Date: May 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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suspend_disk_microvolts. This holds the regulator output
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voltage setting for this domain measured in microvolts when
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the system is suspended to disk, for voltage regulators
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implementing suspend voltage configuration constraints.
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What: /sys/class/regulator/.../suspend_standby_microvolts
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Date: May 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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suspend_standby_microvolts. This holds the regulator output
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voltage setting for this domain measured in microvolts when
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the system is suspended to standby, for voltage regulators
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implementing suspend voltage configuration constraints.
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What: /sys/class/regulator/.../suspend_mem_mode
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Date: May 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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suspend_mem_mode. This holds the regulator operating mode
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setting for this domain when the system is suspended to
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memory, for regulators implementing suspend mode
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configuration constraints.
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What: /sys/class/regulator/.../suspend_disk_mode
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Date: May 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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suspend_disk_mode. This holds the regulator operating mode
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setting for this domain when the system is suspended to disk,
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for regulators implementing suspend mode configuration
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constraints.
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What: /sys/class/regulator/.../suspend_standby_mode
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Date: May 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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suspend_standby_mode. This holds the regulator operating mode
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setting for this domain when the system is suspended to
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standby, for regulators implementing suspend mode
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configuration constraints.
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What: /sys/class/regulator/.../suspend_mem_state
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Date: May 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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suspend_mem_state. This holds the regulator operating state
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when suspended to memory, for regulators implementing suspend
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configuration constraints.
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This will be one of the same strings reported by
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the "state" attribute.
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What: /sys/class/regulator/.../suspend_disk_state
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Date: May 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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suspend_disk_state. This holds the regulator operating state
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when suspended to disk, for regulators implementing
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suspend configuration constraints.
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This will be one of the same strings reported by
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the "state" attribute.
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What: /sys/class/regulator/.../suspend_standby_state
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Date: May 2008
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KernelVersion: 2.6.26
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Contact: Liam Girdwood <lrg@slimlogic.co.uk>
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Description:
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Some regulator directories will contain a field called
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suspend_standby_state. This holds the regulator operating
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state when suspended to standby, for regulators implementing
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suspend configuration constraints.
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This will be one of the same strings reported by
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the "state" attribute.
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