Documentation: Add documentation for GPIO toggling in ACPI AML

Hardware / Coreboot - Furquan Shaikh [chromium.org] - 28 October 2016 17:13 UTC

This document provides information about the different functions that a driver can use for generating ACPI code for toggling GPIO. These functions are expected to be implemented by the SoC. It also defines the different constraints on use of Local variables in ACPI code while implementing these functions.

BUG=chrome-os-partner:55988

Change-Id: Ibc03d766afb6d7b75bc0dc9f79920b561f1c4a78

4ef7491 Documentation: Add documentation for GPIO toggling in ACPI AML
Documentation/acpi/gpio.md | 162 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 162 insertions(+)

Upstream: review.coreboot.org

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