[PATCH V3 5/5] input: pxa27x-keypad: add device tree support

Arnd Bergmann
2013-06-20T09:06:20Z

On Thursday 20 June 2013, Chao Xie wrote:
> On Wed, Jun 19, 2013 at 7:13 PM, Gerhard Sittig <gsi@denx.de> wrote:
> > On Wed, Jun 19, 2013 at 16:38 +0800, Chao Xie wrote:
> >>
> >> On Wed, Jun 19, 2013 at 4:22 PM, Marek Vasut <marex@denx.de> wrote:
> >> >
> >> >> Signed-off-by: Chao Xie <chao.xie@marvell.com>
> >> >> [ ... ]
> >> >> +++ b/Documentation/devicetree/bindings/input/pxa27x-keypad.txt
> >> >> @@ -0,0 +1,60 @@
> >> >> +* Marvell PXA Keypad controller
> >> >> +
> >> >> +Required Properties
> >> >> +- compatible : should be "marvell,pxa27x-keypad"
> >> >> +- reg : Address and length of the register set for the device
> >> >> +- interrupts : The interrupt for the keypad controller
> >> >> +- marvell,debounce-interval : How long time the key will be
> >> >
> >> > Is there no generic prop name for this debounce interval?
> >> >
> >> I searched at drivers/input and Documents.
> >> Two drivers use "debounce-interval", gpio-keys.c and stmpe-keypad.c.
> >> They describe the meanings of "debounce-interval" at its own document file.
> >> Some other drivers uses "xxx,debounce-delay-ms" or "debounce-delay-ms"
> >> So it seems that there is no generic prop name for this debounce interval.
> >
> > Actually there is, but under a different (more user friendly)
> > name: See the 'debounce-delay-ms' property in
> > Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
> > which gets referenced in the matrix_keypad_parse_dt() routine in
> > the drivers/input/keyboard/matrix_keypad.c source file. Ah, your
> > last sentence mentions that fact.
> >
> > But when you introduce DT support into an existing driver which
> > previously used platform data, then there is no problem with
> > backwards compatibility in .dts files. So I suggest to go with
> > the "debounce-delay-ms" name since it better reflects to the .dts
> > author (hardware engineer) which unit the number is supposed to
> > be specified in.
> >
> So Arnd
> What do you think? I am fine with either one.

debounce-delay-ms

Arnd