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Add slave mode support to the MSIOF driver, in both PIO and DMA mode. For now this only supports the transmission of messages with a size that is known in advance. Signed-off-by: Hisashi Nakamura <hisashi.nakamura.ak@renesas.com> Signed-off-by: Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@renesas.com> [geert: Timeout handling cleanup, spi core integration, cancellation, rewording] Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>