b817bf5c72
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: Thierry Reding <thierry.reding@avionic-design.de> Acked-by: Borislav Petkov <bp@alien8.de>
127 lines
3.5 KiB
Text
127 lines
3.5 KiB
Text
menuconfig PWM
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bool "Pulse-Width Modulation (PWM) Support"
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depends on !MACH_JZ4740 && !PUV3_PWM
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help
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Generic Pulse-Width Modulation (PWM) support.
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In Pulse-Width Modulation, a variation of the width of pulses
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in a rectangular pulse signal is used as a means to alter the
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average power of the signal. Applications include efficient
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power delivery and voltage regulation. In computer systems,
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PWMs are commonly used to control fans or the brightness of
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display backlights.
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This framework provides a generic interface to PWM devices
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within the Linux kernel. On the driver side it provides an API
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to register and unregister a PWM chip, an abstraction of a PWM
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controller, that supports one or more PWM devices. Client
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drivers can request PWM devices and use the generic framework
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to configure as well as enable and disable them.
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This generic framework replaces the legacy PWM framework which
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allows only a single driver implementing the required API. Not
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all legacy implementations have been ported to the framework
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yet. The framework provides an API that is backward compatible
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with the legacy framework so that existing client drivers
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continue to work as expected.
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If unsure, say no.
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if PWM
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config PWM_BFIN
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tristate "Blackfin PWM support"
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depends on BFIN_GPTIMERS
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help
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Generic PWM framework driver for Blackfin.
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To compile this driver as a module, choose M here: the module
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will be called pwm-bfin.
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config PWM_IMX
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tristate "i.MX pwm support"
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depends on ARCH_MXC
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help
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Generic PWM framework driver for i.MX.
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To compile this driver as a module, choose M here: the module
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will be called pwm-imx.
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config PWM_LPC32XX
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tristate "LPC32XX PWM support"
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depends on ARCH_LPC32XX
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help
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Generic PWM framework driver for LPC32XX. The LPC32XX SOC has two
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PWM controllers.
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To compile this driver as a module, choose M here: the module
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will be called pwm-lpc32xx.
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config PWM_MXS
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tristate "Freescale MXS PWM support"
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depends on ARCH_MXS && OF
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select STMP_DEVICE
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help
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Generic PWM framework driver for Freescale MXS.
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To compile this driver as a module, choose M here: the module
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will be called pwm-mxs.
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config PWM_PXA
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tristate "PXA PWM support"
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depends on ARCH_PXA
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help
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Generic PWM framework driver for PXA.
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To compile this driver as a module, choose M here: the module
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will be called pwm-pxa.
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config PWM_SAMSUNG
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tristate "Samsung pwm support"
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depends on PLAT_SAMSUNG
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help
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Generic PWM framework driver for Samsung.
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To compile this driver as a module, choose M here: the module
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will be called pwm-samsung.
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config PWM_TEGRA
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tristate "NVIDIA Tegra PWM support"
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depends on ARCH_TEGRA
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help
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Generic PWM framework driver for the PWFM controller found on NVIDIA
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Tegra SoCs.
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To compile this driver as a module, choose M here: the module
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will be called pwm-tegra.
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config PWM_TIECAP
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tristate "ECAP PWM support"
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depends on SOC_AM33XX
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help
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PWM driver support for the ECAP APWM controller found on AM33XX
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TI SOC
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To compile this driver as a module, choose M here: the module
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will be called pwm-tiecap.
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config PWM_TIEHRPWM
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tristate "EHRPWM PWM support"
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depends on SOC_AM33XX
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help
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PWM driver support for the EHRPWM controller found on AM33XX
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TI SOC
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To compile this driver as a module, choose M here: the module
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will be called pwm-tiehrpwm.
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config PWM_VT8500
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tristate "vt8500 pwm support"
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depends on ARCH_VT8500
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help
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Generic PWM framework driver for vt8500.
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To compile this driver as a module, choose M here: the module
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will be called pwm-vt8500.
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endif
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