Re: [PATCHv5 1/3] Input: twl4030-pwrbutton - add device tree support

[Sebastian Reichel]

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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