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spi: mxs: Introduce spi_cs_is_valid()

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Introduce spi_cs_is_valid() for validating spi bus and chip select numbers.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Fabio Estevam 2012-04-23 08:30:49 +00:00 committed by Albert ARIBAUD
parent 6ecaee8201
commit 79cb14ab39
1 changed files with 11 additions and 2 deletions
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13
drivers/spi/mxs_spi.c
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@ -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;
}