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This is required later to allow devices to assert a service request (SRQ) signal to indicate that it has data to send, without having to consume it. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Tested-by: Finn Thain <fthain@telegraphics.com.au> Acked-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20200623204936.24064-12-mark.cave-ayland@ilande.co.uk>