Hi Rob,

On Thu, 2017-08-10 at 15:41 -0500, Rob Herring wrote:
> On Mon, Aug 07, 2017 at 09:57:42AM +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.zh...@mediatek.com>
> > ---
> >  .../devicetree/bindings/input/mtk-pmic-keys.txt    |   36 
> > ++++++++++++++++++++
> >  1 file changed, 36 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..c5b230f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/input/mtk-pmic-keys.txt
> > @@ -0,0 +1,36 @@
> > +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"
> > +- mediatek,pwrkey-code: Keycode of pwrkey
> > +
> > +Optional Properties:
> > +- mediatek,homekey-code: Keycode of homekey
> > +- mediatek,long-press-mode: Long press key shutdown setting, 1 for
> > +   pwrkey only, 2 for pwrkey/homekey together, others for disabled.
> > +- mediatek,long-press-duration: Long press key shutdown duration setting,
> > +   0/1/2/3 for 8/11/14/5 seconds.
> 
> Surely this could be a common property.

Sorry I'm not very clear about this. Could i move this to required
properties or remove the "mediatek" string here?

> 
> > +
> > +Example:
> > +
> > +   pmic: mt6397 {
> > +           compatible = "mediatek,mt6397";
> > +
> > +           ...
> > +
> > +           mt6397keys: mt6397keys {
> > +                   compatible = "mediatek,mt6397-keys";
> > +                   mediatek,pwrkey-code = <116>;
> > +                   mediatek,homekey-code = <114>;
> 
> We have a standard properties for keycodes.

Could i write them like this way?

linux,keycodes = <KEY_POWER>, <KEY_VOLUMEDOWN>

> 
> > +                   mediatek,long-press-mode = <1>;
> > +                   mediatek,long-press-duration = <0>;
> > +           };
> > +   };
> > \ No newline at end of file
> > -- 
> > 1.7.9.5
> > 

Thanks.

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