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IDT 89HPESx PCIe-switches exposes SMBus interface to have an access to the device CSRs and EEPROM. So to properly utilize the interface functionality, developer should declare a valid dts-file node, which would refer to the corresponding 89HPESx device. Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>