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

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Date:	Thu, 24 Oct 2013 00:49:42 +0200
From:	Sebastian Reichel <sre@...ian.org>
To:	Rob Herring <robherring2@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	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 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

-- Sebastian

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