Re: [PATCH 1/2] mmc: core: Add a capability for disabling mmc cards

[Philip Rakity]

On Aug 22, 2012, at 8:44 AM, Doug Anderson <dianders@xxxxxxxxxxxx> wrote:

> Jaehoon,
> 
> On Tue, Aug 21, 2012 at 9:35 PM, Jaehoon Chung <jh80.chung@xxxxxxxxxxx> wrote:
>> 
>> Hi Doug,
>> 
>> I didn't know what purpose is.
>> Why need to add the MMC_CAP2_NO_MMC?
>> If card is SD or SDIO, mmc_attach_mmc(host) should not be entered.
>> Could you explain to me in more detail?
> 
> Thanks for your feedback.  In this case I have a card that is an MMC
> card so mmc_attach_sdio() and mmc_attach_sd() will fail.  If I let
> mmc_attach_mmc() run it will actually find the MMC card.  However, on
> this platform it is not valid to recognize MMC cards.
> 


Understand.   

Can you explain why the change is needed.  Is it for technical 
reasons that MMC is not allowed -- if so then I do not understand how SD can work
and MMC cannot.

If it is for marketing reasons -- then --- oh well .....


Could you add some additional comments to the commit message.
I think it makes sense to handle all 3 cases
a) SDIO not allowed
b) SD not allowed
c) MMC not allowed

> -Doug
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