Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit c06e677a authored by David Brownell's avatar David Brownell Committed by Linus Torvalds
Browse files

SPI: add 3wire mode flag 



Add a new spi->mode bit: SPI_3WIRE, for chips where the SI and SO signals
are shared (and which are thus only half duplex).  Update the LM70 driver
to require support for that hardware mode from the controller.

Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent dccd573b

drivers/hwmon/lm70.c

+4 −0
Original line number Diff line number Diff line
@@ -96,6 +96,10 @@ static int __devinit lm70_probe(struct spi_device *spi) 
	struct lm70 *p_lm70;

	int status;



	/* signaling is SPI_MODE_0 on a 3-wire link (shared SI/SO) */

	if ((spi->mode & (SPI_CPOL|SPI_CPHA)) || !(spi->mode & SPI_3WIRE))

		return -EINVAL;



	p_lm70 = kzalloc(sizeof *p_lm70, GFP_KERNEL);

	if (!p_lm70)

		return -ENOMEM;

include/linux/spi/spi.h

+1 −0
Original line number Diff line number Diff line
@@ -76,6 +76,7 @@ struct spi_device { 
#define	SPI_MODE_3	(SPI_CPOL|SPI_CPHA)

#define	SPI_CS_HIGH	0x04			/* chipselect active high? */

#define	SPI_LSB_FIRST	0x08			/* per-word bits-on-wire */

#define	SPI_3WIRE	0x10			/* SI/SO signals shared */

	u8			bits_per_word;

	int			irq;

	void			*controller_state;