[RFC 2/3] mmc: sdhci: add host_ops->voltage_switch callback for all other voltages

[Ulf Hansson]

[...]

>>>>
>>>> Could this be implemented by regulator API? From patch set 3/3, the
>>>> pxa1928
>>>> voltage_switch hook is to operate the IO pad registers, this seems not
>>>> belong
>>>> to the SDHC IP core.
>>>>
>>>
>>> Not quite sure whether regulator would be right fit for this.
>>
>>
>>  From the patche[3/3], this can be achieved by abstracting the IO PAD as
>> regulators
>> then, we may not need to touch the core sdhci.c. But I'm not sure whether
>> this
>> is the good solution or not.
>
>
> Exactly...
>
>> sdhci Maintainers and experts may have better
>> suggestions.
>>
>
> Thats is the reason I stamped it as a RFC :)
>

[...]

>From an mmc core perspective it would be preferred if you implement
this as a regulator (vqmmc).

Especially since we will soon have an API for how to set the I/O
voltages - and the intelligence within that API is not something we
would like to implement for each and every host driver.
https://lkml.org/lkml/2015/8/31/367

Kind regards
Uffe