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SubjectRe: [PATCH v3 1/8] soc: mediatek: Add PMIC wrapper for MT8135 and MT6397 SoC
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Hi, Arnd,

On Fri, 2014-12-05 at 11:13 +0100, Arnd Bergmann wrote:
> On Friday 05 December 2014 12:07:52 Flora Fu wrote:
> > Add PMIC wrapper of MT8135 to access MT6397 MFD.
> >
> > Signed-off-by: Flora Fu <flora.fu@mediatek.com>
> >
>
> Please explain what a PMIC wrapper is and why you need one for MT8135.
> I don't understand the purpose of this code at all. Is this just another
> way of accessing the MT6397 when not using i2c or spi like other
> PMIC drivers do?
>

Yes, MT8135 uses a proprietary hardware to communicate with MT6397.
The hardware is called PMIC Wrapper or PWRAP.
Since it is not standard i2c or spi protocols, a soc related software
driver is implemented to handle access protocols in AP side.

+-----------------+ +---------------+
| | | |
| Mediatek AP SoC | | |
| (ex. MT8135) | | MT6397 |
| | | |
| +--------+ | (SPI bus) | +--------+ |
| | | |-----------| | | |
| | PMIC | |-----------| | PMIC | |
| | Wrapper| |-----------| | Wrapper| |
| | | |-----------| | | |
| +--------+ | | +--------+ |
| | | |
+-----------------+ +---------------+

Thanks,
Flora




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