Re: [PATCH v4 2/5] dt-bindings: input: Add document bindings for mtk-pmic-keys

Chen Zhong
2017-09-23T06:47:03Z

Sorry for the typo.

On Sat, 2017-09-23 at 14:38 +0800, Chen Zhong wrote:
> On Wed, 2017-09-20 at 15:53 -0500, Rob Herring wrote:
> > On Sun, Sep 17, 2017 at 04:00:49PM +0800, Chen Zhong wrote:
> > > This patch adds the device tree binding documentation for the MediaTek
> > > pmic keys found on PMIC MT6397/MT6323.
> > >
> > > Signed-off-by: Chen Zhong <chen.zhong@mediatek.com>
> > > ---
> > > .../devicetree/bindings/input/mtk-pmic-keys.txt | 41 ++++++++++++++++++++
> > > 1 file changed, 41 insertions(+)
> > > create mode 100644 Documentation/devicetree/bindings/input/mtk-pmic-keys.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/input/mtk-pmic-keys.txt b/Documentation/devicetree/bindings/input/mtk-pmic-keys.txt
> > > new file mode 100644
> > > index 0000000..fd48ff7
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/input/mtk-pmic-keys.txt
> > > @@ -0,0 +1,41 @@
> > > +MediaTek MT6397/MT6323 PMIC Keys Device Driver
> > > +
> > > +There are two key functions provided by MT6397/MT6323 PMIC, pwrkey
> > > +and homekey. The key functions are defined as the subnode of the function
> > > +node provided by MT6397/MT6323 PMIC that is being defined as one kind
> > > +of Muti-Function Device (MFD)
> > > +
> > > +For MT6397/MT6323 MFD bindings see:
> > > +Documentation/devicetree/bindings/mfd/mt6397.txt
> > > +
> > > +Required properties:
> > > +- compatible: "mediatek,mt6397-keys" or "mediatek,mt6323-keys"
> > > +- linux,keycodes: Specifies the numeric keycode values to
> > > + be used for reporting keys presses. The array can
> > > + contain up to 2 entries.
> > > +
> > > +Optional Properties:
> > > +- mediatek,wakeup-keys: Specifies each key can be used as a wakeup source
> > > + or not. This can be customized depends on board design.
> >
> > I think this should be a common property if we're going to put into DT.
> > Something like "wakeup-scancodes" to be clear the values are the raw
> > scancodes. Alternatively, we could list Linux keycodes instead with
> > something like "linux,wakeup-keycodes".
> >
> > > +- wakeup-source: PMIC keys can be used as wakeup sources.
> >
> > Just "See ../power/wakeup-source.txt" for the description.
> >
> > > +- mediatek,long-press-mode: Long press key shutdown setting, 1 for
> > > + pwrkey only, 2 for pwrkey/homekey together, others for disabled.
> > > +- debounce-interval: Long press key shutdown debouncing interval time
> > > + in seconds. 0/1/2/3 for 8/11/14/5 seconds. If not specified defaults to 0.
> >
> > This property units should be in milliseconds. However, this doesn't
> > sound like debounce filtering time if 5-14 seconds. That sounds like
> > forced power off time (i.e. for a hung device). This also should be
> > common. I imagine we already have some drivers with similar properties.
>
> Hi Rob,
>
> I searched in kernel documents and found a similar usage in
> "ti,palmas-pwrbutton.txt"
> "- ti,palmas-long-press-seconds: Duration in seconds which the power
> button should be kept pressed for Palmas to power off automatically."
>
> Could I just wrote it like this?
> mediatek,long-press-seconds = <0>;
>
> And for the wakeup source part, how about Dmitry's suggestion?
> The whole device node would be:
>
> mt6397keys: mt6397keys {
> compatible = "mediatek,mt6397-keys";
> mediatek,long-press-mode = <1>;
> mediatek,long-press-seconds = <0>;
>
> power@0 {
> linux,code = <116>;
> wakeup-source;
> };
>
> home@0 {
should be home@1 {
> linux,code = <114>;
> };
> };
>
> Thank you.
>
> >
> > Rob
>