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authorBoris Brezillon <boris.brezillon@free-electrons.com>2016-06-14 12:13:21 +0300
committerThierry Reding <thierry.reding@gmail.com>2016-07-25 16:34:06 +0300
commitea398e28739e25651ede7ddf5aeb57cbcbc8ca7d (patch)
treec01ed5831f0b7356c8106997f3787d0c83ac6cfb /tools/usb
parentd9070fdbe40a04b61262bac0f7ff0c7c29a68015 (diff)
downloadlinux-ea398e28739e25651ede7ddf5aeb57cbcbc8ca7d.tar.xz
regulator: pwm: Support extra continuous mode cases
The continuous mode allows one to declare a PWM regulator without having to declare the voltage <-> dutycycle association table. It works fine as long as your voltage(dutycycle) function is linear, but also has the following constraints: - dutycycle for min_uV = 0% - dutycycle for max_uV = 100% - dutycycle for min_uV < dutycycle for max_uV While the linearity constraint is acceptable for now, we sometimes need to restrict of the PWM range (to limit the maximum/minimum voltage for example) or have a min_uV_dutycycle > max_uV_dutycycle (this could be tweaked with PWM polarity, but not all PWMs support inverted polarity). Add the pwm-dutycycle-range and pwm-dutycycle-unit DT properties to define such constraints. If those properties are not defined, the PWM regulator use the default pwm-dutycycle-range = <0 100> and pwm-dutycycle-unit = <100> values (existing behavior). Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Reviewed-by: Brian Norris <briannorris@chromium.org> Tested-by: Brian Norris <briannorris@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Mark Brown <broonie@kernel.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
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