Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-linus (cb7a97d0) · Commits · e / devices / android_kernel_teracube_2e

Documentation/ABI/testing/sysfs-class-regulator

+60 −76

Original line number	Diff line number	Diff line
		@@ -3,8 +3,9 @@ Date: April 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		state. This holds the regulator output state.
		Some regulator directories will contain a field called
		state. This reports the regulator enable status, for
		regulators which can report that value.

		This will be one of the following strings:

		@@ -18,7 +19,8 @@ Description:
		'disabled' means the regulator output is OFF and is not
		supplying power to the system..

		'unknown' means software cannot determine the state.
		'unknown' means software cannot determine the state, or
		the reported state is invalid.

		NOTE: this field can be used in conjunction with microvolts
		and microamps to determine regulator output levels.
		@@ -53,9 +55,10 @@ Date: April 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		microvolts. This holds the regulator output voltage setting
		measured in microvolts (i.e. E-6 Volts).
		measured in microvolts (i.e. E-6 Volts), for regulators
		which can report that voltage.

		NOTE: This value should not be used to determine the regulator
		output voltage level as this value is the same regardless of
		@@ -67,9 +70,10 @@ Date: April 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		microamps. This holds the regulator output current limit
		setting measured in microamps (i.e. E-6 Amps).
		setting measured in microamps (i.e. E-6 Amps), for regulators
		which can report that current.

		NOTE: This value should not be used to determine the regulator
		output current level as this value is the same regardless of
		@@ -81,8 +85,9 @@ Date: April 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		opmode. This holds the regulator operating mode setting.
		Some regulator directories will contain a field called
		opmode. This holds the current regulator operating mode,
		for regulators which can report it.

		The opmode value can be one of the following strings:

		@@ -92,7 +97,7 @@ Description:
		'standby'
		'unknown'

		The modes are described in include/linux/regulator/regulator.h
		The modes are described in include/linux/regulator/consumer.h

		NOTE: This value should not be used to determine the regulator
		output operating mode as this value is the same regardless of
		@@ -104,9 +109,10 @@ Date: April 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		min_microvolts. This holds the minimum safe working regulator
		output voltage setting for this domain measured in microvolts.
		output voltage setting for this domain measured in microvolts,
		for regulators which support voltage constraints.

		NOTE: this will return the string 'constraint not defined' if
		the power domain has no min microvolts constraint defined by
		@@ -118,9 +124,10 @@ Date: April 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		max_microvolts. This holds the maximum safe working regulator
		output voltage setting for this domain measured in microvolts.
		output voltage setting for this domain measured in microvolts,
		for regulators which support voltage constraints.

		NOTE: this will return the string 'constraint not defined' if
		the power domain has no max microvolts constraint defined by
		@@ -132,10 +139,10 @@ Date: April 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		min_microamps. This holds the minimum safe working regulator
		output current limit setting for this domain measured in
		microamps.
		microamps, for regulators which support current constraints.

		NOTE: this will return the string 'constraint not defined' if
		the power domain has no min microamps constraint defined by
		@@ -147,10 +154,10 @@ Date: April 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		max_microamps. This holds the maximum safe working regulator
		output current limit setting for this domain measured in
		microamps.
		microamps, for regulators which support current constraints.

		NOTE: this will return the string 'constraint not defined' if
		the power domain has no max microamps constraint defined by
		@@ -185,7 +192,7 @@ Date: April 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		requested_microamps. This holds the total requested load
		current in microamps for this regulator from all its consumer
		devices.
		@@ -204,125 +211,102 @@ Date: May 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		suspend_mem_microvolts. This holds the regulator output
		voltage setting for this domain measured in microvolts when
		the system is suspended to memory.

		NOTE: this will return the string 'not defined' if
		the power domain has no suspend to memory voltage defined by
		platform code.
		the system is suspended to memory, for voltage regulators
		implementing suspend voltage configuration constraints.

		What: /sys/class/regulator/.../suspend_disk_microvolts
		Date: May 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		suspend_disk_microvolts. This holds the regulator output
		voltage setting for this domain measured in microvolts when
		the system is suspended to disk.

		NOTE: this will return the string 'not defined' if
		the power domain has no suspend to disk voltage defined by
		platform code.
		the system is suspended to disk, for voltage regulators
		implementing suspend voltage configuration constraints.

		What: /sys/class/regulator/.../suspend_standby_microvolts
		Date: May 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		suspend_standby_microvolts. This holds the regulator output
		voltage setting for this domain measured in microvolts when
		the system is suspended to standby.

		NOTE: this will return the string 'not defined' if
		the power domain has no suspend to standby voltage defined by
		platform code.
		the system is suspended to standby, for voltage regulators
		implementing suspend voltage configuration constraints.

		What: /sys/class/regulator/.../suspend_mem_mode
		Date: May 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		suspend_mem_mode. This holds the regulator operating mode
		setting for this domain when the system is suspended to
		memory.

		NOTE: this will return the string 'not defined' if
		the power domain has no suspend to memory mode defined by
		platform code.
		memory, for regulators implementing suspend mode
		configuration constraints.

		What: /sys/class/regulator/.../suspend_disk_mode
		Date: May 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		suspend_disk_mode. This holds the regulator operating mode
		setting for this domain when the system is suspended to disk.

		NOTE: this will return the string 'not defined' if
		the power domain has no suspend to disk mode defined by
		platform code.
		setting for this domain when the system is suspended to disk,
		for regulators implementing suspend mode configuration
		constraints.

		What: /sys/class/regulator/.../suspend_standby_mode
		Date: May 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		suspend_standby_mode. This holds the regulator operating mode
		setting for this domain when the system is suspended to
		standby.

		NOTE: this will return the string 'not defined' if
		the power domain has no suspend to standby mode defined by
		platform code.
		standby, for regulators implementing suspend mode
		configuration constraints.

		What: /sys/class/regulator/.../suspend_mem_state
		Date: May 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		suspend_mem_state. This holds the regulator operating state
		when suspended to memory.

		This will be one of the following strings:
		when suspended to memory, for regulators implementing suspend
		configuration constraints.

		'enabled'
		'disabled'
		'not defined'
		This will be one of the same strings reported by
		the "state" attribute.

		What: /sys/class/regulator/.../suspend_disk_state
		Date: May 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		suspend_disk_state. This holds the regulator operating state
		when suspended to disk.

		This will be one of the following strings:
		when suspended to disk, for regulators implementing
		suspend configuration constraints.

		'enabled'
		'disabled'
		'not defined'
		This will be one of the same strings reported by
		the "state" attribute.

		What: /sys/class/regulator/.../suspend_standby_state
		Date: May 2008
		KernelVersion: 2.6.26
		Contact: Liam Girdwood <lrg@slimlogic.co.uk>
		Description:
		Each regulator directory will contain a field called
		Some regulator directories will contain a field called
		suspend_standby_state. This holds the regulator operating
		state when suspended to standby.

		This will be one of the following strings:
		state when suspended to standby, for regulators implementing
		suspend configuration constraints.

		'enabled'
		'disabled'
		'not defined'
		This will be one of the same strings reported by
		the "state" attribute.

Documentation/DocBook/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -12,7 +12,7 @@ DOCBOOKS := z8530book.xml mcabook.xml \
		kernel-api.xml filesystems.xml lsm.xml usb.xml kgdb.xml \
		gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \
		genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml \
		mac80211.xml debugobjects.xml sh.xml
		mac80211.xml debugobjects.xml sh.xml regulator.xml

		###
		# The build process is as follows (targets):

Documentation/DocBook/regulator.tmpl

0 → 100644

+304 −0

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		<?xml version="1.0" encoding="UTF-8"?>
		<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
		"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>

		<book id="regulator-api">
		<bookinfo>
		<title>Voltage and current regulator API</title>

		<authorgroup>
		<author>
		<firstname>Liam</firstname>
		<surname>Girdwood</surname>
		<affiliation>
		<address>
		<email>lrg@slimlogic.co.uk</email>
		</address>
		</affiliation>
		</author>
		<author>
		<firstname>Mark</firstname>
		<surname>Brown</surname>
		<affiliation>
		<orgname>Wolfson Microelectronics</orgname>
		<address>
		<email>broonie@opensource.wolfsonmicro.com</email>
		</address>
		</affiliation>
		</author>
		</authorgroup>

		<copyright>
		<year>2007-2008</year>
		<holder>Wolfson Microelectronics</holder>
		</copyright>
		<copyright>
		<year>2008</year>
		<holder>Liam Girdwood</holder>
		</copyright>

		<legalnotice>
		<para>
		This documentation is free software; you can redistribute
		it and/or modify it under the terms of the GNU General Public
		License version 2 as published by the Free Software Foundation.
		</para>

		<para>
		This program is distributed in the hope that it will be
		useful, but WITHOUT ANY WARRANTY; without even the implied
		warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
		See the GNU General Public License for more details.
		</para>

		<para>
		You should have received a copy of the GNU General Public
		License along with this program; if not, write to the Free
		Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
		MA 02111-1307 USA
		</para>

		<para>
		For more details see the file COPYING in the source
		distribution of Linux.
		</para>
		</legalnotice>
		</bookinfo>

		<toc></toc>

		<chapter id="intro">
		<title>Introduction</title>
		<para>
		This framework is designed to provide a standard kernel
		interface to control voltage and current regulators.
		</para>
		<para>
		The intention is to allow systems to dynamically control
		regulator power output in order to save power and prolong
		battery life. This applies to both voltage regulators (where
		voltage output is controllable) and current sinks (where current
		limit is controllable).
		</para>
		<para>
		Note that additional (and currently more complete) documentation
		is available in the Linux kernel source under
		<filename>Documentation/power/regulator</filename>.
		</para>

		<sect1 id="glossary">
		<title>Glossary</title>
		<para>
		The regulator API uses a number of terms which may not be
		familiar:
		</para>
		<glossary>

		<glossentry>
		<glossterm>Regulator</glossterm>
		<glossdef>
		<para>
		Electronic device that supplies power to other devices. Most
		regulators can enable and disable their output and some can also
		control their output voltage or current.
		</para>
		</glossdef>
		</glossentry>

		<glossentry>
		<glossterm>Consumer</glossterm>
		<glossdef>
		<para>
		Electronic device which consumes power provided by a regulator.
		These may either be static, requiring only a fixed supply, or
		dynamic, requiring active management of the regulator at
		runtime.
		</para>
		</glossdef>
		</glossentry>

		<glossentry>
		<glossterm>Power Domain</glossterm>
		<glossdef>
		<para>
		The electronic circuit supplied by a given regulator, including
		the regulator and all consumer devices. The configuration of
		the regulator is shared between all the components in the
		circuit.
		</para>
		</glossdef>
		</glossentry>

		<glossentry>
		<glossterm>Power Management Integrated Circuit</glossterm>
		<acronym>PMIC</acronym>
		<glossdef>
		<para>
		An IC which contains numerous regulators and often also other
		subsystems. In an embedded system the primary PMIC is often
		equivalent to a combination of the PSU and southbridge in a
		desktop system.
		</para>
		</glossdef>
		</glossentry>
		</glossary>
		</sect1>
		</chapter>

		<chapter id="consumer">
		<title>Consumer driver interface</title>
		<para>
		This offers a similar API to the kernel clock framework.
		Consumer drivers use <link
		linkend='API-regulator-get'>get</link> and <link
		linkend='API-regulator-put'>put</link> operations to acquire and
		release regulators. Functions are
		provided to <link linkend='API-regulator-enable'>enable</link>
		and <link linkend='API-regulator-disable'>disable</link> the
		reguator and to get and set the runtime parameters of the
		regulator.
		</para>
		<para>
		When requesting regulators consumers use symbolic names for their
		supplies, such as "Vcc", which are mapped into actual regulator
		devices by the machine interface.
		</para>
		<para>
		A stub version of this API is provided when the regulator
		framework is not in use in order to minimise the need to use
		ifdefs.
		</para>

		<sect1 id="consumer-enable">
		<title>Enabling and disabling</title>
		<para>
		The regulator API provides reference counted enabling and
		disabling of regulators. Consumer devices use the <function><link
		linkend='API-regulator-enable'>regulator_enable</link></function>
		and <function><link
		linkend='API-regulator-disable'>regulator_disable</link>
		</function> functions to enable and disable regulators. Calls
		to the two functions must be balanced.
		</para>
		<para>
		Note that since multiple consumers may be using a regulator and
		machine constraints may not allow the regulator to be disabled
		there is no guarantee that calling
		<function>regulator_disable</function> will actually cause the
		supply provided by the regulator to be disabled. Consumer
		drivers should assume that the regulator may be enabled at all
		times.
		</para>
		</sect1>

		<sect1 id="consumer-config">
		<title>Configuration</title>
		<para>
		Some consumer devices may need to be able to dynamically
		configure their supplies. For example, MMC drivers may need to
		select the correct operating voltage for their cards. This may
		be done while the regulator is enabled or disabled.
		</para>
		<para>
		The <function><link
		linkend='API-regulator-set-voltage'>regulator_set_voltage</link>
		</function> and <function><link
		linkend='API-regulator-set-current-limit'
		>regulator_set_current_limit</link>
		</function> functions provide the primary interface for this.
		Both take ranges of voltages and currents, supporting drivers
		that do not require a specific value (eg, CPU frequency scaling
		normally permits the CPU to use a wider range of supply
		voltages at lower frequencies but does not require that the
		supply voltage be lowered). Where an exact value is required
		both minimum and maximum values should be identical.
		</para>
		</sect1>

		<sect1 id="consumer-callback">
		<title>Callbacks</title>
		<para>
		Callbacks may also be <link
		linkend='API-regulator-register-notifier'>registered</link>
		for events such as regulation failures.
		</para>
		</sect1>
		</chapter>

		<chapter id="driver">
		<title>Regulator driver interface</title>
		<para>
		Drivers for regulator chips <link
		linkend='API-regulator-register'>register</link> the regulators
		with the regulator core, providing operations structures to the
		core. A <link
		linkend='API-regulator-notifier-call-chain'>notifier</link> interface
		allows error conditions to be reported to the core.
		</para>
		<para>
		Registration should be triggered by explicit setup done by the
		platform, supplying a <link
		linkend='API-struct-regulator-init-data'>struct
		regulator_init_data</link> for the regulator containing
		<link linkend='machine-constraint'>constraint</link> and
		<link linkend='machine-supply'>supply</link> information.
		</para>
		</chapter>

		<chapter id="machine">
		<title>Machine interface</title>
		<para>
		This interface provides a way to define how regulators are
		connected to consumers on a given system and what the valid
		operating parameters are for the system.
		</para>

		<sect1 id="machine-supply">
		<title>Supplies</title>
		<para>
		Regulator supplies are specified using <link
		linkend='API-struct-regulator-consumer-supply'>struct
		regulator_consumer_supply</link>. This is done at
		<link linkend='driver'>driver registration
		time</link> as part of the machine constraints.
		</para>
		</sect1>

		<sect1 id="machine-constraint">
		<title>Constraints</title>
		<para>
		As well as definining the connections the machine interface
		also provides constraints definining the operations that
		clients are allowed to perform and the parameters that may be
		set. This is required since generally regulator devices will
		offer more flexibility than it is safe to use on a given
		system, for example supporting higher supply voltages than the
		consumers are rated for.
		</para>
		<para>
		This is done at <link linkend='driver'>driver
		registration time</link> by providing a <link
		linkend='API-struct-regulation-constraints'>struct
		regulation_constraints</link>.
		</para>
		<para>
		The constraints may also specify an initial configuration for the
		regulator in the constraints, which is particularly useful for
		use with static consumers.
		</para>
		</sect1>
		</chapter>

		<chapter id="api">
		<title>API reference</title>
		<para>
		Due to limitations of the kernel documentation framework and the
		existing layout of the source code the entire regulator API is
		documented here.
		</para>
		!Iinclude/linux/regulator/consumer.h
		!Iinclude/linux/regulator/machine.h
		!Iinclude/linux/regulator/driver.h
		!Edrivers/regulator/core.c
		</chapter>
		</book>

Documentation/RCU/00-INDEX

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		@@ -12,6 +12,8 @@ rcuref.txt
		- Reference-count design for elements of lists/arrays protected by RCU
		rcu.txt
		- RCU Concepts
		rcubarrier.txt
		- Unloading modules that use RCU callbacks
		RTFP.txt
		- List of RCU papers (bibliography) going back to 1980.
		torture.txt

Documentation/RCU/rcubarrier.txt

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