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From: Olliver Schinagl <oliver@schinagl.nl> This patch adds a bit-banging gpio PWM driver. It makes use of hrtimers, to allow nano-second resolution, though it obviously strongly depends on the switching speed of the gpio pins, hrtimer and system load. Each pwm node can have 1 or more "pwm-gpio" entries, which will be treated as pwm's as part of a pwm chip. Change-Id: Idd42bf6d79f8ce52275a15965b02af470f28da7c Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>