Re: Re: [v4,1/6] mmc: dt: add DT binding for big endian controller

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On 27 August 2015 at 20:39, Li Leo <LeoLi@xxxxxxxxxxxxx> wrote:
>> > Or Maybe there is another method, use conditional compilation. The previous
>> method would delete the MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER to
>> use accessors defined in sdhci-esdhc.h, and add dependency of ARM. This
>> method could use 'select <accessors> if <ARCH>' to compile LE or BE accessors
>> according ARCH.
>>
>> I don't really follow your suggestion.
>>
>> Isn't the problem that you need the
>> MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER for configurations and for
>> some you don't? More precisely, for those where you don't you would
>> rather just use the regulator ioread* functions since those will
>> internally deal with the endianess in runtime?
>>
>> If you can make these decisions at compile time an depending of the
>> ARCH - I believe I would be fine with that as well.
>
> I know it is a little bit weird.  But the endian of the peripheral device is not always consistent with the type/endian of the core.

Yes got it. So it seems relying on the ARCH in compile time isn't
going to be a long term solution.

Then it's better to have a default mode and then via DT be able to
change that, right? As you suggested above.

Kind regards
Uffe
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