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Document the GPIO Aggregator, and the two typical use-cases. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Eugeniu Rosca <erosca@de.adit-jv.com> Reviewed-by: Ulrich Hecht <uli+renesas@fpond.eu> Reviewed-by: Eugeniu Rosca <erosca@de.adit-jv.com> Link: https://lore.kernel.org/r/20200511145257.22970-6-geert+renesas@glider.be Signed-off-by: Linus Walleij <linus.walleij@linaro.org>