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Some peripherals on Bay Trail and Cherry Trail platforms signal a Power Management Event (PME) to the Power Management Controller (PMC) to wakeup the system. When this happens software needs to explicitly clear the PME bus 0 status bit in the GPE0a_STS register to avoid an IRQ storm on IRQ 9. This is modelled in ACPI through the INT0002 ACPI device, which is called a "Virtual GPIO controller" in ACPI because it defines the event handler to call when the PME triggers through _AEI and _L02 methods as would be done for a real GPIO interrupt in ACPI. This commit adds a driver which registers the Virtual GPIOs expected by the DSDT on these devices, letting gpiolib-acpi claim the virtual GPIO and install a GPIO-interrupt handler which call the _L02 handler as it would for a real GPIO controller. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.