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

[zhangfei gao]

On Wed, Jun 8, 2011 at 7:51 AM, Philip Rakity <prakity at marvell.com> wrote:
>
> On May 29, 2011, at 10:42 PM, zhangfei gao wrote:
>
>>>
>>> There is a little room for simplification, I think:
>>>
>>>> +static unsigned int mmp2_get_ro(struct sdhci_host *host)
>>>> +{
>>>> +     /* Micro SD does not support write-protect feature */
>>>> +     return 0;
>>>> +}
>>>
>>> You shouldn't need to provide an empty get_ro function, the
>>> default is that there is no write-protect.
>>
>> Thanks Arnd for review.
>> The reason to put get_ro here is some board use micro sd, while some
>> board design is general sd card.
>> The micro sd do not use write-protect, while SDHCI_WRITE_PROTECT will
>> return 1 in our controller, so it shows read only.
>> So add one call back for the board with micro sd card via flag.
>
>
>
> The code sets get_ro is for all the controllers.   Some board designs may connect the WP signal.
>
> The host->ops field should be filled in using information in the board
> file using a flag such as the example with  PXA_FLAG_CARD_PERMANENT.
>
> eg
>
>        if (pdata && pdata->flags & PXA_FLAG_NO_WP) {
>                ***** etc ****
>        }
>
>

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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