0x1b33d2d6 #ˆl–Ü4ý(© ³( Å €fàD¦-ÿÅ „ Î<ÀÇ?÷# SPDX-License-Identifier: GPL-2.0-only 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_DEBUG bool "PWM lowlevel drivers additional checks and debug messages" depends on DEBUG_KERNEL help This option enables some additional checks to help lowlevel driver authors to get their callbacks implemented correctly. It is expected to introduce some runtime overhead and diagnostic output to the kernel log, so only enable while working on a driver. 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 || COMPILE_TEST depends on HAS_IOMEM && OF 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_HLCDC_PWM tristate "Atmel HLCDC PWM support" depends on MFD_ATMEL_HLCDC depends on HAVE_CLK help Generic PWM framework driver for the PWM output of the HLCDC (Atmel High-end LCD Controller). This PWM output is mainly used to control the LCD backlight. To compile this driver as a module, choose M here: the module will be called pwm-atmel-hlcdc. config PWM_ATMEL_TCB tristate "Atmel TC Block PWM support" depends on OF select REGMAP_MMIO 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_BCM_IPROC tristate "iProc PWM support" depends on ARCH_BCM_IPROC || COMPILE_TEST depends on COMMON_CLK && HAS_IOMEM default ARCH_BCM_IPROC help Generic PWM framework driver for Broadcom iProc PWM block. This block is used in Broadcom iProc SoC's. To compile this driver as a module, choose M here: the module will be called pwm-bcm-iproc. config PWM_BCM_KONA tristate "Kona PWM support" depends on ARCH_BCM_MOBILE || ARCH_BCM_CYGNUS || COMPILE_TEST depends on HAVE_CLK && HAS_IOMEM default ARCH_BCM_MOBILE || ARCH_BCM_CYGNUS help Generic PWM framework driver for Broadcom Kona PWM block. To compile this driver as a module, choose M here: the module will be called pwm-bcm-kona. config PWM_BCM2835 tristate "BCM2835 PWM support" depends on ARCH_BCM2835 || ARCH_BRCMSTB || COMPILE_TEST depends on HAS_IOMEM help PWM framework driver for BCM2835 controller (Raspberry Pi) To compile this driver as a module, choose M here: the module will be called pwm-bcm2835. config PWM_BERLIN tristate "Marvell Berlin PWM