acpi: Add support for a generic power sequence
Add a way for devices to enable and disable themselves using ACPI code that updates GPIOs. This takes several timing parameters and supports enable, reset and stop. 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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