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The MediaTek MT8196 SoC includes an embedded MCU referred to as "GPUEB", acting as glue logic to control power and frequency of the Mali GPU. This MCU runs special-purpose firmware for this use, and the main application processor communicates with it through a mailbox. Add a binding that describes this mailbox. Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Acked-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com> Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>