mx6qsabresd: Adding eMMC suport

[Dong Aisheng]

Hi Fabio,

On Mon, Nov 18, 2013 at 12:49:27PM -0200, Fabio Estevam wrote:
> Hi,
> 
> When I add support to esdhc4 port, which is connected to a eMMC on mx6qsabresd:
> 
> --- a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> @@ -229,6 +229,10 @@
>                 pinctrl_usdhc3: usdhc3grp {
>                         fsl,pins = <MX6QDL_USDHC3_PINGRP1>;
>                 };
> +
> +               pinctrl_usdhc4: usdhc4grp {
> +                       fsl,pins = <MX6QDL_USDHC4_PINGRP1>;
> +               };
>         };
>  };
> 
> @@ -304,3 +308,11 @@
>         wp-gpios = <&gpio2 1 0>;
>         status = "okay";
>  };
> +
> +&usdhc4 {
> +       pinctrl-names = "default";
> +       pinctrl-0 = <&pinctrl_usdhc4>;
> +       bus-width = <8>;
> +       non-removable;
> +       status = "okay";
> +};
> 
> I get the following:
> 
> mmc2: Timeout waiting for hardware interrupt.
>  mmcblk1boot1: unknown partition table
> mmc2: Timeout waiting for hardware interrupt.
>  mmcblk1boot0: unknown partition table
> 
> The boots proceeds until the end, but there is a big delay due to the
> above messages.
> 
> Does anything special need to be done in order to support eMMC?
> 

It's already fixed but still not in Chris' tree.
Please refer to:
http://comments.gmane.org/gmane.linux.kernel.mmc/23339

Regards
Dong Aisheng

> Regards,
> 
> Fabio Estevam
>