[PATCH v2 1/3] mmc: support sdhci-mmp2

[zhangfei gao]

>>
>> This method is used in v1,
>> The method makes sdhci_ops non-const and have to dynamically alloc
>> sdhci_ops, since host->ops is pointer.
>> Will keep use const sdhci_ops, recommended by Arnd.
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> Not acceptable.
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> There are  3 cases for  WP signal
>
> a) They are connected to the controller using GPIO
> b( They are NOT connected and the corresponding  pin is not used
> c) They are NOT connected and the corresponding  pin is used by something else.
>
> case a)
>        program GPIO as is done today in brownstone and aspen
>
> case b)
>        configure the MFP pin to be pull high/low to indicate NO WP.  The pin cannot be left floating

Thanks, configure WP pin to LOW should be work for micro sd card.
>
> case c)
>        you need a quirk and the call back.
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