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For a CPU to enter an idle state, some timer must be available to trigger an IRQ and wake it back up. The local ARM architectural timer is not sufficient, because that timer stops when the CPU is powered down. The ARM architectural timer from some other CPU can be used, but doing so prevents that other CPU from entering an idle state. For all CPUs to power down at the same time, Linux needs a timer which is not tied to any CPU. Hook up the "sun4i" timer so it can be used for this purpose. It runs at 24 MHz, which balances resolution and power consumption. Signed-off-by: Samuel Holland <samuel@sholland.org> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://lore.kernel.org/r/20210322044707.19479-5-samuel@sholland.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.