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Setting num-interpolated-steps in the dts will allow you to have linear interpolation between values of brightness-levels. This way a high resolution pwm duty cycle can be used without having to list out every possible value in the dts. This system also allows for gamma corrected values. The most simple example is interpolate between two brightness values a number of steps, this can be done setting the following in the dts: brightness-levels = <0 65535>; num-interpolated-steps = <1024>; default-brightness-level = <512>; This will create a brightness-level table with the following values: <0 63 126 189 252 315 378 441 ... 64260 64323 64386 64449 65535> Another use case can be describe a gamma corrected curve, as we have better sensitivity at low luminance than high luminance we probably want have smaller steps for low brightness levels values and bigger steps for high brightness levels values. This can be achieved with the following in the dts: brightness-levels = <0 4096 65535>; num-interpolated-steps = <1024>; default-brightness-level = <512>; This will create a brightness-levels table with the following values: <0 4 8 12 16 20 ... 4096 4156 4216 4276 ... 65535> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Acked-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.