[U-Boot] [PATCH v2 1/2] spi: mxs: Introduce spi_cs_is_valid()

[Marek Vasut <marex@denx.de>]

Dear Fabio Estevam,

> 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>
> ---
> Changes since v1:
> - Newly introduced in v2
> 
>  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;
>  	}

Best regards,
Marek Vasut