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2021-06-09counter: interrupt-cnt: Add const qualifier for functions_list arrayWilliam Breathitt Gray
The struct counter_count functions_list member expects a const enum counter_count_function array. This patch adds the const qualifier to the interrupt__cnt_functions to match functions_list. Cc: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/86f7fb77f703cf2508a6b4ee9cf80aa523392976.1623201081.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-03-25counter: add IRQ or GPIO based counterOleksij Rempel
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>