[U-Boot] [PATCH V2 1/4] mmc: fsl_esdhc: introduce vs18_enable for 1.8V fix I/O

[Jagan Teki]

On Mon, May 8, 2017 at 12:32 PM, Peng Fan <peng.fan at nxp.com> wrote:
> When using eMMC with 1.8V I/O, the VSELECT bit need to be set in
> the USDHC controller when init.
>
> This patch adds a parameter "vs18_enable" in fsl_esdhc_cfg
> structure and priv data, so each controller can have different
> settings.
>
> We could not use CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT, it has problem
> that it will apply to all USDHC controllers and it only set the 1.8V
> at init phase. So if user does not select to the eMMC device,
> the voltage on the I/O pins are not correct.
>
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
> Cc: Jaehoon Chung <jh80.chung at samsung.com>
> Cc: York Sun <york.sun at nxp.com>
> Cc: Stefano Babic <sbabic at denx.de>
> ---
>
> V2: None
>
>  drivers/mmc/fsl_esdhc.c | 9 +++++++++
>  include/fsl_esdhc.h     | 1 +
>  2 files changed, 10 insertions(+)
>
> diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
> index f3c6358..bddfe24 100644
> --- a/drivers/mmc/fsl_esdhc.c
> +++ b/drivers/mmc/fsl_esdhc.c
> @@ -92,6 +92,7 @@ struct fsl_esdhc {
>   * @dev: pointer for the device
>   * @non_removable: 0: removable; 1: non-removable
>   * @wp_enable: 1: enable checking wp; 0: no check
> + * @vs18_enable: 1: use 1.8V voltage; 0: use 3.3V
>   * @cd_gpio: gpio for card detection
>   * @wp_gpio: gpio for write protection
>   */
> @@ -104,6 +105,7 @@ struct fsl_esdhc_priv {
>         struct udevice *dev;
>         int non_removable;
>         int wp_enable;
> +       int vs18_enable;

I think this can be achieved with adding "no-1-8-v" property.

thanks!
-- 
Jagan Teki
Free Software Engineer | www.openedev.com
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.