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Some of the regulators must be always-on to ensure correct operation of the system, e.g. PM8916 L2 for the LPDDR RAM, L5 for most digital I/O and L7 for the CPU PLL (strictly speaking the CPU PLL might only need an active-only vote but this is not supported for regulators in mainline currently). The RPM firmware seems to enforce that internally, these supplies stay on even if we vote for them to power off (and there is no other processor running). This means it's pointless to keep sending enable/disable requests because they will just be ignored. Also, drivers are much more likely to get a wrong impression of the regulator status, because regulator_is_enabled() will return false when there are no users, even though the regulator is always on. Describe this properly by marking the regulators as always-on. Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Signed-off-by: Bjorn Andersson <andersson@kernel.org> Link: https://lore.kernel.org/r/20230510-msm8916-regulators-v1-8-54d4960a05fc@gerhold.net
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.