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Commit b817bf5c authored by Thierry Reding's avatar Thierry Reding
Browse files

pwm: Improve Kconfig help text 



The Kconfig help text should help the user understand what functionality
is provided by an option. This is especially true for new subsystems. An
improved help text is provided by this commit in the hopes of clarifying
the usefulness of the PWM framework.

Signed-off-by: default avatarThierry Reding <thierry.reding@avionic-design.de>
Acked-by: default avatarBorislav Petkov <bp@alien8.de>
parent e50d3523

drivers/pwm/Kconfig

+25 −6
Original line number Diff line number Diff line 
menuconfig PWM

	bool "PWM Support"

	bool "Pulse-Width Modulation (PWM) Support"

	depends on !MACH_JZ4740 && !PUV3_PWM

	help

	  This enables PWM support through the generic PWM framework.

	  You only need to enable this, if you also want to enable

	  one or more of the PWM drivers below.



	  If unsure, say N.

	  Generic Pulse-Width Modulation (PWM) support.



	  In Pulse-Width Modulation, a variation of the width of pulses

	  in a rectangular pulse signal is used as a means to alter the

	  average power of the signal. Applications include efficient

	  power delivery and voltage regulation. In computer systems,

	  PWMs are commonly used to control fans or the brightness of

	  display backlights.



	  This framework provides a generic interface to PWM devices

	  within the Linux kernel. On the driver side it provides an API

	  to register and unregister a PWM chip, an abstraction of a PWM

	  controller, that supports one or more PWM devices. Client

	  drivers can request PWM devices and use the generic framework

	  to configure as well as enable and disable them.



	  This generic framework replaces the legacy PWM framework which

	  allows only a single driver implementing the required API. Not

	  all legacy implementations have been ported to the framework

	  yet. The framework provides an API that is backward compatible

	  with the legacy framework so that existing client drivers

	  continue to work as expected.



	  If unsure, say no.



if PWM