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spi-bcm2835.c, spi-sun6i.c: In order to support SPI_RTIOC_TRANSFER_N ioctl option add functions bcm2835_transfer_iobufs_n() and sun6i_transfer_iobufs_n() which are similar to ..._transfer_iobufs(), but allow user specified len for spi transfer. Signed-off-by: Laurentiu-Cristian Duca <laurentiu.duca@gmail.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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