diff options
| -rw-r--r-- | drivers/spi/mxs_spi.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/spi/mxs_spi.c b/drivers/spi/mxs_spi.c index 4e6f14e..e7237e7 100644 --- a/drivers/spi/mxs_spi.c +++ b/drivers/spi/mxs_spi.c @@ -51,14 +51,23 @@ void spi_init(void) { } +int spi_cs_is_valid(unsigned int bus, unsigned int cs) +{ + /* MXS SPI: 4 ports and 3 chip selects maximum */ + if (bus > 3 || cs > 2) + return 0; + else + return 1; +} + struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, unsigned int max_hz, unsigned int mode) { struct mxs_spi_slave *mxs_slave; uint32_t addr; - if (bus > 3) { - printf("MXS SPI: Max bus number is 3\n"); + if (!spi_cs_is_valid(bus, cs)) { + printf("mxs_spi: invalid bus %d / chip select %d\n", bus, cs); return NULL; } |