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a55ebd47f2
Add simple IRQ or GPIO base counter. This device is used to measure rotation speed of some agricultural devices, so no high frequency on the counter pin is expected. The maximal measurement frequency depends on the CPU and system load. On the idle iMX6S I was able to measure up to 20kHz without count drops. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Reviewed-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/20210301080401.22190-3-o.rempel@pengutronix.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
95 lines
2.8 KiB
Plaintext
95 lines
2.8 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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#
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# Counter devices
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#
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menuconfig COUNTER
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tristate "Counter support"
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help
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This enables counter device support through the Generic Counter
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interface. You only need to enable this, if you also want to enable
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one or more of the counter device drivers below.
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if COUNTER
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config 104_QUAD_8
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tristate "ACCES 104-QUAD-8 driver"
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depends on PC104 && X86
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select ISA_BUS_API
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help
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Say yes here to build support for the ACCES 104-QUAD-8 quadrature
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encoder counter/interface device family (104-QUAD-8, 104-QUAD-4).
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A counter's respective error flag may be cleared by performing a write
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operation on the respective count value attribute. Although the
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104-QUAD-8 counters have a 25-bit range, only the lower 24 bits may be
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set, either directly or via the counter's preset attribute. Interrupts
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are not supported by this driver.
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The base port addresses for the devices may be configured via the base
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array module parameter.
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config INTERRUPT_CNT
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tristate "Interrupt counter driver"
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depends on GPIOLIB
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help
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Select this option to enable interrupt counter driver. Any interrupt
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source can be used by this driver as the event source.
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To compile this driver as a module, choose M here: the
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module will be called interrupt-cnt.
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config STM32_TIMER_CNT
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tristate "STM32 Timer encoder counter driver"
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depends on MFD_STM32_TIMERS || COMPILE_TEST
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help
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Select this option to enable STM32 Timer quadrature encoder
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and counter driver.
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To compile this driver as a module, choose M here: the
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module will be called stm32-timer-cnt.
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config STM32_LPTIMER_CNT
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tristate "STM32 LP Timer encoder counter driver"
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depends on MFD_STM32_LPTIMER || COMPILE_TEST
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help
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Select this option to enable STM32 Low-Power Timer quadrature encoder
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and counter driver.
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To compile this driver as a module, choose M here: the
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module will be called stm32-lptimer-cnt.
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config TI_EQEP
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tristate "TI eQEP counter driver"
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depends on (SOC_AM33XX || COMPILE_TEST)
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select REGMAP_MMIO
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help
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Select this option to enable the Texas Instruments Enhanced Quadrature
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Encoder Pulse (eQEP) counter driver.
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To compile this driver as a module, choose M here: the module will be
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called ti-eqep.
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config FTM_QUADDEC
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tristate "Flex Timer Module Quadrature decoder driver"
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depends on HAS_IOMEM && OF
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help
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Select this option to enable the Flex Timer Quadrature decoder
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driver.
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To compile this driver as a module, choose M here: the
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module will be called ftm-quaddec.
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config MICROCHIP_TCB_CAPTURE
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tristate "Microchip Timer Counter Capture driver"
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depends on HAS_IOMEM && OF
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select REGMAP_MMIO
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help
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Select this option to enable the Microchip Timer Counter Block
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capture driver.
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To compile this driver as a module, choose M here: the
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module will be called microchip-tcb-capture.
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endif # COUNTER
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