SPI loopback mode definition (4ef7af50) · Commits · e / devices / android_kernel_teracube_emerald

Loopback mode is supported by various controllers. This mode can be useful for testing, especially in conjunction with spidev driver. Signed-off-by:

include/linux/spi/spi.h

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -77,6 +77,7 @@ struct spi_device {
	#define SPI_CS_HIGH 0x04 /* chipselect active high? */		#define SPI_CS_HIGH 0x04 /* chipselect active high? */
	#define SPI_LSB_FIRST 0x08 /* per-word bits-on-wire */		#define SPI_LSB_FIRST 0x08 /* per-word bits-on-wire */
	#define SPI_3WIRE 0x10 /* SI/SO signals shared */		#define SPI_3WIRE 0x10 /* SI/SO signals shared */
			#define SPI_LOOP 0x20 /* loopback mode */
	u8 bits_per_word;		u8 bits_per_word;
	int irq;		int irq;
	void *controller_state;		void *controller_state;