acpi: Add support for writing a GPIO power sequence
Power to some devices is controlled by GPIOs. Add a way to generate ACPI code to enable and disable a GPIO so that this can be handled within an ACPI method. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NWolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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