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liaoao
ae6ad9c193
Add a new getrecvbuf callback to the SPI slave device operations that allows the slave device to provide a pre-allocated receive buffer directly to the controller. This enables zero-copy data transfer by allowing the controller to receive data directly into the device's buffer instead of copying. Changes: - Add SPIS_DEV_GETRECVBUF macro and getrecvbuf callback to spi_slave_devops_s structure in include/nuttx/spi/slave.h - Implement getrecvbuf in rpmsg_port_spi_slave driver - Update getdata to return 0 as it's no longer used for this path Signed-off-by: liaoao <liaoao@xiaomi.com>