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diff --git a/Documentation/DocBook/regulator.tmpl b/Documentation/DocBook/regulator.tmpl deleted file mode 100644 index 3b08a085d2c7..000000000000 --- a/Documentation/DocBook/regulator.tmpl +++ /dev/null @@ -1,304 +0,0 @@ -<?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 - regulator 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 defining the connections the machine interface - also provides constraints defining 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> |