u8 rx_threshold;
u8 dma_burst_size;
u32 timeout;
- u8 enable_loopback;
int gpio_cs;
};
slave device. Please note that the PXA2xx SSP 1 does not support trailing byte
timeouts and must busy-wait any trailing bytes.
-The "pxa2xx_spi_chip.enable_loopback" field is used to place the SSP porting
-into internal loopback mode. In this mode the SSP controller internally
-connects the SSPTX pin to the SSPRX pin. This is useful for initial setup
-testing.
-
NOTE: the SPI driver cannot control the chip select if SSPFRM is used, so the
chipselect is dropped after each spi_transfer. Most devices need chip select
asserted around the complete message. Use SSPFRM as a GPIO (through a descriptor)