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@xxxxxxxxxxxx> > > > > 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
