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This driver enables outputs by setting bit EN_BUCKn in the BUCKn_CTRL1 register. However, if bit EN_PIN_CTRLn in the same register is set, the output is actually enabled only if EN_BUCKn is set AND an enable pin is active. Since the driver does not touch EN_PIN_CTRLn, the choice is left to the hardware, which in turn gets this bit from OTP memory, and in absence of OTP data it uses a default value that is documented in the datasheet for LP8752x, but not for LP8756x. Thus the driver doesn't really "know" whether it is actually enabling the output or not. In order to make sure activation is always driver-controlled, just clear the EN_PIN_CTRLn bit. Now all activation solely depend on the EN_BUCKn bit. Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net> Link: https://lore.kernel.org/r/20200622204329.11147-2-luca@lucaceresoli.net Signed-off-by: Mark Brown <broonie@kernel.org> |
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| README | ||
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.