can: mcp251x: add support for half duplex controllers
Some SPI host controllers do not support full-duplex SPI and are marked as such via the SPI_CONTROLLER_HALF_DUPLEX controller flag. For such controllers use half duplex transactions but retain full duplex transactions for the controllers that can handle those. Signed-off-by:Tim Harvey <tharvey@gateworks.com> Link: https://lore.kernel.org/r/1595516275-1179-1-git-send-email-tharvey@gateworks.com Signed-off-by:
Marc Kleine-Budde <mkl@pengutronix.de>
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