[U-Boot] [PATCH] mmc: add generic mmc spi driver

[Thomas Chou <thomas@wytron.com.tw>]

On 04/23/2010 11:35 AM, Mike Frysinger wrote:
> On Thursday 22 April 2010 22:53:34 Thomas Chou wrote:
>    
>> This patch supports mmc/sd card with spi interface.
>> I have tested with sd and mmc cards. But there is still ocr issue
>> with SDHC.
>>      
> now the semi-obvious question ... how does this differ from the old spi_mmc.c
> driver ?  i see this doesnt rely on the legacy mmc framework, but what about
> device/commandset support parity ?
>
>    
Hi Mike,

Right after playing your spi_mmc.c, I started this one based on generic 
mmc framework last night. I tried hard to recall my memory about mmc/sd, 
and hoped to catch up the merge window.

Do you mean "parity" as crc? Crc is not supported, but can be added. I 
make some command set translation when spi doesn't support.

> it's too bad the new framework doesnt allow for dynamic probing like the spi
> layer.  makes it a pain to work with a SPI/MMC card that can have the CS
> changed on the fly.
> -mike
>    
Maybe we can move spi_setup_slave to the mmc->init() and  do probing. Or 
shall we add a subcommand?

Cheers,
Thomas