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The required LED pulse width depends on board-specific optical and mechanical design, which affects measurement accuracy and power use. Making it configurable via Device Tree allows each platform to define an appropriate value instead of relying on a hardcoded default. If unspecified, the driver defaults to 1600 us for backward compatibility. Tested on: Raspberry Pi 3B + MAX30100 breakout board. Reviewed-by: Nuno Sa <nuno.sa@analog.com> Signed-off-by: Shrikant Raskar <raskar.shree97@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>