acpi: Support writing a GPIO
Allowing writing out a reference to a GPIO within the ACPI output. This can be used by ACPI code to access a GPIO at runtime. 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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