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49b472ebc6
Add NACK check after start byte is sent. It is possible to detect early that a device is not on the bus and avoid invalid transmissions thereafter. Signed-off-by: Clark Wang <xiaoning.wang@nxp.com> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/r/20230517033030.3068085-3-xiaoning.wang@nxp.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>