linux-kernel - Re: Input: add Atmel Atmegaxx captouch driver

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Message-ID: <572C61B1.2040508@atmel.com>
Date:	Fri, 6 May 2016 11:19:45 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Grant Grundler <grundler@...omium.org>,
	Rob Herring <robh@...nel.org>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input <linux-input@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux DeviceTree <devicetree@...r.kernel.org>,
	Hung-yu Wu <hywu@...gle.com>
Subject: Re: Input: add Atmel Atmegaxx captouch driver

Le 05/05/2016 18:04, Grant Grundler a écrit :
> On Wed, May 4, 2016 at 6:51 AM, Rob Herring <robh@...nel.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