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IPQ8074 has one Gen2 and one Gen3 PCIe port, with Gen2 already supported. Document Gen3 port which uses the same controller as IPQ6018. Link: https://lore.kernel.org/r/20230113164449.906002-6-robimarko@gmail.com Signed-off-by: Robert Marko <robimarko@gmail.com> Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>