linux-kernel - Re: [PATCHv5 1/3] Input: twl4030-pwrbutton

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Date:	Fri, 25 Oct 2013 20:40:18 +0100
From:	Grant Likely <grant.likely@...aro.org>
To:	Sebastian Reichel <sre@...ian.org>,
	Rob Herring <robherring2@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Peter Ujfalusi <peter.ujfalusi@...com>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCHv5 1/3] Input: twl4030-pwrbutton - add device tree support

On Thu, 24 Oct 2013 00:49:42 +0200, Sebastian Reichel <sre@...ian.org> wrote:
> On Wed, Oct 23, 2013 at 05:24:14PM -0500, Rob Herring wrote:
> > So a twl4030 device is only a power button? DT should describe the h/w
> > not a node for a sub-function of a device.
> 
> No. TWL4030 is a companion chip for the OMAP3 processor. It provides
> miscellaneous functionality, e.g.:
> 
>  * RTC
>  * Watchdog
>  * Regulators
>  * Keypad Matrix
>  * USB
>  * Audio
>  * Vibrator
>  * GPIO
>  * ...
> 
> One part of the functionality is the power button. The patch
> assumes, that the twl4030-pwrbutton node is used as follows:
> 
> twl {
>     /* ... common stuff ... */
> 
>     pwrbutton {
>         compatible = "ti,twl4030-pwrbutton";
> 		interrupts = <8>;
>     };
> };
> 
> See also:
> * Documentation/devicetree/bindings/mfd/twl-familly.txt
> * Documentation/devicetree/bindings/watchdog/twl4030-wdt.txt
> * Documentation/devicetree/bindings/sound/omap-twl4030.txt
> * Documentation/devicetree/bindings/mfd/twl4030-power.txt
> * Documentation/devicetree/bindings/mfd/twl4030-audio.txt
> * Documentation/devicetree/bindings/gpio/gpio-twl4030.txt

Wow, that's crazy! It is all one device so put all the bindings into a
single file.

g,

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