The register set is different, and this chip does not support calibration.
The I2C protocol is not the same as well; there is an additional byte
indicating data length.

Atmega88PA is a general-purpose MCU. In the future, we will add more
functionalities, such as firmware upgrade through I2C.

On Fri, May 6, 2016 at 5:19 PM, Nicolas Ferre <nicolas.ferre@atmel.com>
wrote:

> Le 05/05/2016 18:04, Grant Grundler a écrit :
> > On Wed, May 4, 2016 at 6:51 AM, Rob Herring <robh@kernel.org> wrote:
> > ...
> >>> +Required properties:
> >>> +
> >>> +     compatible:     Must be "atmel,atmegaxx_captouch".
> >>
> >> No wildcards in the compatible strings. Use the specific devices.
> >>
> >> Also, use hyphen rather than underscore. However, if the device is only
> >> a touch controller, then '_captouch' is not needed. The part number is
> >> sufficient to identify the device.
> >
> > The primary part used on the board is AtMega88PA. Details of that SoC
> > are public:
> >     http://www.atmel.com/devices/ATMEGA88PA.aspx
> >
> > I don't see why the exact chip is relevant to the driver. The driver
> > is just talking to an I2C device that reports button events.  The
> > protocol across the I2C determines what this driver has to do and that
> > protocol is implemented by the on-board firmware (supplied by Atmel).
> > Any AVR CPU could implement this same protocol.
> >
> > Can we call this "atmel,qtouch-buttons-v2" or something like that?
>
> Is it different from the Atmel QT1070 or QT2160 which have drivers
> already available in Linux:
> drivers/input/keyboard/qt1070.c
>
> Bye,
>
> > I personally don't have anything invested in any particular name. Feel
> > free to suggest a different one. I'm perfectly happy with any color
> > paint on the shed.
> >
> > ...
> >>> +Example:
> >>> +
> >>> +     atmegaxx_captouch@51 {
> >>
> >> atmegaxx@51 (with actual part number)
> >
> > Is "qtouch-buttons@51" ok?
> >
> >>
> >>> +             compatible = "atmel,atmegaxx_captouch";
> >>> +             reg = <0x51>;
> >>> +             interrupt-parent = <&tlmm>;
> >>> +             interrupts = <67 IRQ_TYPE_EDGE_FALLING>;
> >>> +             linux,keycodes = <BTN_0>, <BTN_1>,
> >>> +                     <BTN_2>, <BTN_3>,
> >>> +                     <BTN_4>, <BTN_5>,
> >>> +                     <BTN_6>, <BTN_7>;
> >>> +             autorepeat;
> >>> +     };
> >
> > cheers,
> > grant
> > --
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> >
>
>
> --
> Nicolas Ferre
>