menuconfig PWM bool "Pulse-Width Modulation (PWM) Support" help 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 config PWM_SYSFS bool default y if SYSFS config PWM_AB8500 tristate "AB8500 PWM support" depends on AB8500_CORE && ARCH_U8500 help Generic PWM framework driver for Analog Baseband AB8500. To compile this driver as a module, choose M here: the module will be called pwm-ab8500. config PWM_ATMEL tristate "Atmel PWM support" depends on ARCH_AT91 help Generic PWM framework driver for Atmel SoC. To compile this driver as a module, choose M here: the module will be called pwm-atmel. config PWM_ATMEL_TCB tristate "Atmel TC Block PWM support" depends on ATMEL_TCLIB && OF help Generic PWM framework driver for Atmel Timer Counter Block. A Timer Counter Block provides 6 PWM devices grouped by 2. Devices in a given group must have the same period. To compile this driver as a module, choose M here: the module will be called pwm-atmel-tcb. config PWM_BFIN tristate "Blackfin PWM support" depends on BFIN_GPTIMERS help Generic PWM framework driver for Blackfin. To compile this driver as a module, choose M here: the module will be called pwm-bfin. config PWM_EP93XX tristate "Cirrus Logic EP93xx PWM support" depends on ARCH_EP93XX help Generic PWM framework driver for Cirrus Logic EP93xx. To compile this driver as a module, choose M here: the module will be called pwm-ep93xx. config PWM_IMX tristate "i.MX PWM support" depends on ARCH_MXC help Generic PWM framework driver for i.MX. To compile this driver as a module, choose M here: the module will be called pwm-imx. config PWM_JZ4740 tristate "Ingenic JZ4740 PWM support" depends on MACH_JZ4740 help Generic PWM framework driver for Ingenic JZ4740 based machines. To compile this driver as a module, choose M here: the module will be called pwm-jz4740. config PWM_LP3943 tristate "TI/National Semiconductor LP3943 PWM support" depends on MFD_LP3943 help Generic PWM framework driver for LP3943 which supports two PWM channels. To compile this driver as a module, choose M here: the module will be called pwm-lp3943. config PWM_LPC32XX tristate "LPC32XX PWM support" depends on ARCH_LPC32XX help Generic PWM framework driver for LPC32XX. The LPC32XX SOC has two PWM controllers. To compile this driver as a module, choose M here: the module will be called pwm-lpc32xx. config PWM_MXS tristate "Freescale MXS PWM support" depends on ARCH_MXS && OF select STMP_DEVICE help Generic PWM framework driver for Freescale MXS. To compile this driver as a module, choose M here: the module will be called pwm-mxs. config PWM_PCA9685 tristate "NXP PCA9685 PWM driver" depends on OF && I2C select REGMAP_I2C help Generic PWM framework driver for NXP PCA9685 LED controller. To compile this driver as a module, choose M here: the module will be called pwm-pca9685. config PWM_PUV3 tristate "PKUnity NetBook-0916 PWM support" depends on ARCH_PUV3 help Generic PWM framework driver for PKUnity NetBook-0916. To compile this driver as a module, choose M here: the module will be called pwm-puv3. config PWM_PXA tristate "PXA PWM support" depends on ARCH_PXA help Generic PWM framework driver for PXA. To compile this driver as a module, choose M here: the module will be called pwm-pxa. config PWM_RENESAS_TPU tristate "Renesas TPU PWM support" depends on ARCH_SHMOBILE || COMPILE_TEST help This driver exposes the Timer Pulse Unit (TPU) PWM controller found in Renesas chips through the PWM API. To compile this driver as a module, choose M here: the module will be called pwm-renesas-tpu. config PWM_SAMSUNG tristate "Samsung PWM support" depends on PLAT_SAMSUNG help Generic PWM framework driver for Samsung. To compile this driver as a module, choose M here: the module will be called pwm-samsung. config PWM_SPEAR tristate "STMicroelectronics SPEAr PWM support" depends on PLAT_SPEAR depends on OF help Generic PWM framework driver for the PWM controller on ST SPEAr SoCs. To compile this driver as a module, choose M here: the module will be called pwm-spear. config PWM_TEGRA tristate "NVIDIA Tegra PWM support" depends on ARCH_TEGRA help Generic PWM framework driver for the PWFM controller found on NVIDIA Tegra SoCs. To compile this driver as a module, choose M here: the module will be called pwm-tegra. config PWM_TIECAP tristate "ECAP PWM support" depends on SOC_AM33XX || ARCH_DAVINCI_DA8XX help PWM driver support for the ECAP APWM controller found on AM33XX TI SOC To compile this driver as a module, choose M here: the module will be called pwm-tiecap. config PWM_TIEHRPWM tristate "EHRPWM PWM support" depends on SOC_AM33XX || ARCH_DAVINCI_DA8XX help PWM driver support for the EHRPWM controller found on AM33XX TI SOC To compile this driver as a module, choose M here: the module will be called pwm-tiehrpwm. config PWM_TIPWMSS bool default y if SOC_AM33XX && (PWM_TIECAP || PWM_TIEHRPWM) help PWM Subsystem driver support for AM33xx SOC. PWM submodules require PWM config space access from submodule drivers and require common parent driver support. config PWM_TWL tristate "TWL4030/6030 PWM support" depends on TWL4030_CORE help Generic PWM framework driver for TWL4030/6030. To compile this driver as a module, choose M here: the module will be called pwm-twl. config PWM_TWL_LED tristate "TWL4030/6030 PWM support for LED drivers" depends on TWL4030_CORE help Generic PWM framework driver for TWL4030/6030 LED terminals. To compile this driver as a module, choose M here: the module will be called pwm-twl-led. config PWM_VT8500 tristate "vt8500 PWM support" depends on ARCH_VT8500 help Generic PWM framework driver for vt8500. To compile this driver as a module, choose M here: the module will be called pwm-vt8500. endif