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14092ffbd7
Set #pwm-cells to the default 3 to gain access to the parameter which allows inverting the PWM signal. This is useful to specify a backlight which has its highest brightness at 0. With the change to use the PWM with inverted polarity the PWM signal is inverted to how it was before this patch. This changes the meaning of the values in the brightness-levels property. I.e. the duty-cycle changes from x/255 to (255-x)/255. Keeping the brightness-levels will then have a big brightness jump from 0 to 127 duty cycle, the other 6 steps will then be barely noticeable. Change the brightness-levels to provide the same brightness-levels as before. Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com> Reviewed-by: Fabio Estevam <festevam@gmail.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
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.
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.