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Document the GPI DMA Engine on the SM8650 Platform.
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231025-topic-sm8650-upstream-bindings-gpi-v2-1-4de85293d730@linaro.org

Signed-off-by: Vinod Koul <vkoul@kernel.org>