sysmo-bts
/
barebox
9
0
Fork 0
Code Releases Activity

spi: omap: support swapping D0/D1 

The OMAP SPI core allows swapping MISO/MOSI and some boards are
wired up that way, so add a property to swap the lines.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
This commit is contained in:
Jan Luebbe 2013-06-10 17:44:10 +02:00 committed by Sascha Hauer
parent 3970661a00
commit b396e118dd
2 changed files with 23 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/spi/omap3_spi.c
View File

@ -106,8 +106,15 @@ int spi_claim_bus(struct spi_device *spi)
/* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS
* REVISIT: this controller could support SPI_3WIRE mode.
*/
conf &= ~(OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1);
conf |= OMAP3_MCSPI_CHCONF_DPE0;
if (omap3_master->swap_miso_mosi) {
/* swapped */
conf |= (OMAP3_MCSPI_CHCONF_IS | OMAP3_MCSPI_CHCONF_DPE1);
conf &= ~OMAP3_MCSPI_CHCONF_DPE0;
} else {
/* bootloader default */
conf &= ~(OMAP3_MCSPI_CHCONF_IS | OMAP3_MCSPI_CHCONF_DPE1);
conf |= OMAP3_MCSPI_CHCONF_DPE0;
}
/* wordlength */
conf &= ~OMAP3_MCSPI_CHCONF_WL_MASK;
@ -343,6 +350,17 @@ static int omap3_spi_setup(struct spi_device *spi)
return 0;
}
static int omap3_spi_probe_dt(struct device_d *dev, struct omap3_spi_master *omap3_master)
{
if (!IS_ENABLED(CONFIG_OFDEVICE) || !dev->device_node)
return -ENODEV;
if (of_property_read_bool(dev->device_node, "ti,pindir-d0-out-d1-in"))
omap3_master->swap_miso_mosi = 1;
return 0;
}
static int omap3_spi_probe(struct device_d *dev)
{
struct spi_master *master;
@ -356,6 +374,8 @@ static int omap3_spi_probe(struct device_d *dev)
omap3_master = xzalloc(sizeof(*omap3_master));
omap3_spi_probe_dt(dev, omap3_master);
master = &omap3_master->master;
master->dev = dev;

1
drivers/spi/omap3_spi.h
View File

@ -93,6 +93,7 @@ struct omap3_spi_master {
* offset of 0x100 between start of register space
* and registers
*/
int swap_miso_mosi;
};
#endif /* _OMAP3_SPI_H_ */