[U-Boot] [U-boot]: MMC: add sdhci generic framework

[Rommel Custodio]

Jagannadha Sutradharudu Teki <jagannadha.sutradharudu-teki <at> xilinx.com> 
writes:

> 
> Hi,
> 
> On..  drivers/mmc/sdhci.c
> +       if (caps & SDHCI_CAN_DO_8BIT)
> +               mmc->host_caps |= MMC_MODE_8BIT;
> 
> Here we are setting 8BIT bus width, if the sdhci capabilities register 18 
bit is set.
> Does 18-bit is really denoted for 8-bit bus width, I cound't find it on 
spec,  
https://www.sdcard.org/developers/overview/host_controller/simple_spec/Simpl
ified_SD_Host_Controller_Spec.pdf

Dear Jagannadha Sutradharudu Teki,

The current u-boot SD/MMC driver supports the latest SD Specification.
You should read version 3.0 of the specification.

> 
> Due to this above error even my controller doesn't support 8-bit, it shows 
a 8-BIT supported.
> 
> Request your help, correct me I am wrong.
> 
> Thanks,
> Jagan.

All the best,
Rommel