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i.MX95 System Manager uses interrupt driven communication which requires the caller to set Bit[0] of channel flags to 1. When transmission completes and the previous general purpose interrupt has been processed by the other core, i.MX95 System Manager will set General Purpose Interrupt Control Register (GCR). U-Boot polls General-purpose Status (GSR) to check if the operation is finished. Signed-off-by: Viorel Suman <viorel.suman@nxp.com> Signed-off-by: Alice Guo <alice.guo@nxp.com> Reviewed-by: Ye Li <ye.li@nxp.com> Reviewed-by: Marek Vasut <marex@denx.de>