[U-Boot] [PATCH v1 06/11] mmc: if possible, poll the busy state using DAT0

[Marek Vasut]

On 6/27/19 12:31 PM, Jean-Jacques Hiblot wrote:
> Using the DAT0 line as a rdy/busy line is an alternative to reading the
> status register of the card. It especially useful in situation where the
> bus is not in a good shape, like when modes are switched.
> This is also how the linux driver behaves.
> 
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot at ti.com>

Is this documented somewhere that this is an OK thing to do ?
If the bus is not in a good shape, what guarantee do we have that DAT0
(part of the bus ;-) ) would be in good shape ?

-- 
Best regards,
Marek Vasut