linux-kernel - Re: [PATCH v2 01/17] dt-bindings: power: reset: mt6323: add bindings for MT6323 power controller

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Date:   Mon, 30 Apr 2018 15:34:23 +0800
From:   Sean Wang <sean.wang@...iatek.com>
To:     Rob Herring <robh@...nel.org>
CC:     <mark.rutland@....com>, <sre@...nel.org>, <lee.jones@...aro.org>,
        <a.zummo@...ertech.it>, <alexandre.belloni@...e-electrons.com>,
        <matthias.bgg@...il.com>, <eddie.huang@...iatek.com>,
        <devicetree@...r.kernel.org>, <linux-rtc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 01/17] dt-bindings: power: reset: mt6323: add
 bindings for MT6323 power controller

On Fri, 2018-04-27 at 15:02 -0500, Rob Herring wrote:
> On Wed, Apr 25, 2018 at 05:32:27PM +0800, sean.wang@...iatek.com wrote:
> > From: Sean Wang <sean.wang@...iatek.com>
> > 
> > Adding device-tree binding for the power controller which is a tiny
> > circuit block present as a part of MT6323 PMIC and is responsible for
> > externally powering off or on a remote SoC the PMIC is connected to.
> > 
> > Cc: devicetree@...r.kernel.org
> > Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> > ---
> >  .../bindings/power/reset/mt6323-poweroff.txt         | 20 ++++++++++++++++++++
> >  1 file changed, 20 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/power/reset/mt6323-poweroff.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/power/reset/mt6323-poweroff.txt b/Documentation/devicetree/bindings/power/reset/mt6323-poweroff.txt
> > new file mode 100644
> > index 0000000..6f7c590
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/power/reset/mt6323-poweroff.txt
> > @@ -0,0 +1,20 @@
> > +Device Tree Bindings for Power Controller on MediaTek PMIC
> > +
> > +The power controller which could be found on PMIC is responsible for externally
> > +powering off or on the remote MediaTek SoC through the circuit BBPU.
> > +
> > +Required properties:
> > +- compatible: Should be one of follows
> > +	"mediatek,mt6323-pwrc": for MT6323 PMIC
> > +
> > +Example:
> > +
> > +	pmic {
> > +		compatible = "mediatek,mt6323";
> > +
> > +		...
> > +
> > +		power-controller {
> > +			compatible = "mediatek,mt6323-pwrc";
> 
> Why do you need this in DT? It doesn't define any resources. The parent 
> can just as well register a reset or poweroff handler.
> 
> Rob
> 

Yes, those binding can be removed. 

I tend to use platform_device_register_data embedded in mfd driver
to probe the existent poweroff driver in the next version.

> > +		};
> > +	}
> > -- 
> > 2.7.4
> >