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Some SoCs have a separate dedicated wake-up interrupt controller that can be used to wake up the system from deeper idle states. We already support configuring a separate interrupt for a gpio-keys button to be used with a gpio line. However, we are lacking support system suspend for cases where a separate interrupt needs to be used in deeper sleep modes. Because of it's nature, gpio-keys does not know about the runtime PM state of the button gpios, and may have several gpio buttons configured for each gpio-keys device instance. Implementing runtime PM support for gpio-keys does not help, and we cannot use drivers/base/power/wakeirq.c support. We need to implement custom wakeirq support for gpio-keys. For handling a dedicated wakeirq for system suspend, we enable and disable it with gpio_keys_enable_wakeup() and gpio_keys_disable_wakeup() that we already use based on device_may_wakeup(). Some systems may have a dedicated wakeirq that can also be used as the main interrupt, this is already working for gpio-keys. Let's add some wakeirq related comments while at it as the usage with a gpio line and separate interrupt line may not be obvious. Tested-by: Dhruva Gole <d-gole@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Link: https://lore.kernel.org/r/20231129110618.27551-2-tony@atomide.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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.