[U-Boot] [PATCH 2/4] mmc: fsl_esdhc: Add support to force VSELECT set

[Troy Kisky <troy.kisky@boundarydevices.com>]

On 2/16/2015 2:38 PM, Otavio Salvador wrote:
> Some boards cannot do voltage negotiation but need to set the VSELECT
> bit forcely to ensure it to work at 1.8V.
> 
> This commit adds CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT flag for this use.
> 
> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
> ---
> 
>  doc/README.fsl-esdhc    | 1 +
>  drivers/mmc/fsl_esdhc.c | 4 ++++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/doc/README.fsl-esdhc b/doc/README.fsl-esdhc
> index b70f271..619c6b2 100644
> --- a/doc/README.fsl-esdhc
> +++ b/doc/README.fsl-esdhc
> @@ -1,5 +1,6 @@
>  CONFIG_SYS_FSL_ESDHC_LE means ESDHC IP is in little-endian mode.
>  CONFIG_SYS_FSL_ESDHC_BE means ESDHC IP is in big-endian mode.
> +CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT forces to run at 1.8V.
>  
>  Accessing ESDHC registers can be determined by ESDHC IP's endian
>  mode or processor's endian mode.
> diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
> index eb0fbf9..5fde2b6 100644
> --- a/drivers/mmc/fsl_esdhc.c
> +++ b/drivers/mmc/fsl_esdhc.c
> @@ -524,6 +524,10 @@ static int esdhc_init(struct mmc *mmc)
>  	/* Set timout to the maximum value */
>  	esdhc_clrsetbits32(&regs->sysctl, SYSCTL_TIMEOUT_MASK, 14 << 16);
>  
> +#ifdef CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT
> +	esdhc_setbits32(&regs->vendorspec, ESDHC_VENDORSPEC_VSELECT);
> +#endif
> +
>  	return 0;
>  }
>  
> 

What if 1 controller needs it set and another needs it clear?