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Soft start is required to avoid inrush current during LAB ramp-up and IBB ramp-down, protecting connected hardware to which we supply voltage. Since soft start is configurable on both LAB and IBB regulators, it was necessary to add two DT properties, respectively "qcom,soft-start-us" to control LAB ramp-up and "qcom,discharge-resistor-kohms" to control the discharge resistor for IBB ramp-down, which obviously brought the need of implementing a of_parse callback for both regulators. Finally, also implement pull-down mode in order to avoid unpredictable behavior when the regulators are disabled (random voltage spikes etc). Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/20210119174421.226541-4-angelogioacchino.delregno@somainline.org Signed-off-by: Mark Brown <broonie@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.