Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH v5 2/2] i2c: sunxi: add P2WI (Push/Pull 2 Wire Interface) controller support | Date | Tue, 10 Jun 2014 15:54:56 +0200 |
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On Tuesday 10 June 2014 15:47:16 Boris BREZILLON wrote: > > +config I2C_SUN6I_P2WI > + tristate "Allwinner sun6i internal P2WI controller" > + depends on ARCH_SUNXI > + help > + If you say yes to this option, support will be included for the > + P2WI (Push/Pull 2 Wire Interface) controller embedded in some sunxi > + SOCs. > + The P2WI looks like an SMBus controller (which supports only byte > + accesses), except that it only supports one slave device. > + This interface is used to connect to specific PMIC devices (like the > + AXP221). > +
Sorry for the stupid question, but why is this an i2c driver if the hardware protocol is completely different?
I understand that a lot of devices can be driven using either spi or i2c, and we have two sets of {directories,maintainers,bus_types,...} for them. Your description sounds like this is a separate option that isn't any closer to i2c than it is to spi.
Would it perhaps be better to expose it only as a regmap rather than an i2c host?
Arnd
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