linux-kernel - RE: [PATCH 2/2] mfd: add documentation for ACT8945A DT bindings

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Date:	Tue, 12 Jan 2016 07:43:10 +0000
From:	"Yang, Wenyou" <Wenyou.Yang@...el.com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	"Mark Rutland" <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH 2/2] mfd: add documentation for ACT8945A DT bindings

Hi Lee,

> -----Original Message-----
> From: Lee Jones [mailto:lee.jones@...aro.org]
> Sent: 2016年1月11日 13:49
> To: Yang, Wenyou <Wenyou.Yang@...el.com>
> Cc: Rob Herring <robh+dt@...nel.org>; Pawel Moll <pawel.moll@....com>;
> Mark Rutland <mark.rutland@....com>; Ian Campbell
> <ijc+devicetree@...lion.org.uk>; Kumar Gala <galak@...eaurora.org>; Ferre,
> Nicolas <Nicolas.FERRE@...el.com>; linux-kernel@...r.kernel.org;
> devicetree@...r.kernel.org
> Subject: Re: [PATCH 2/2] mfd: add documentation for ACT8945A DT bindings
> 
> On Fri, 08 Jan 2016, Wenyou Yang wrote:
> 
> > The Active-semi ACT8945A PMIC is a Multi-Function Device, it has two
> > subdevices:
> >  - Regulator
> >  - Charger
> 
> Is this really an MFD?  What special handling does it require?

Yes, this is an MFD, two sub devices: regulators and charger.

> 
> > This patch adds documentation for ACT8945A DT bindings.
> >
> > Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> > ---
> >
> >  Documentation/devicetree/bindings/mfd/act8945a.txt |   16
> ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/mfd/act8945a.txt
> >
> > diff --git a/Documentation/devicetree/bindings/mfd/act8945a.txt
> > b/Documentation/devicetree/bindings/mfd/act8945a.txt
> > new file mode 100644
> > index 0000000..406db16
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mfd/act8945a.txt
> > @@ -0,0 +1,16 @@
> > +Device-Tree bindings for Active-semi ACT8945A MFD driver
> > +
> > +Required properties:
> > + - compatible: "active-semi,act8945a".
> > + - reg: the I2C slave address for the ACT8945A chip
> > +
> > +The chip exposes two subdevices:
> > + - a regulators: see ../regulator/act8945a-regulator.txt
> > + - a charger: see ../power/act8945a-charger.txt
> > +
> > +Example:
> > +	mfd: act8945a@5b {
> 
> "mfd" is too generic to be a label.
> 
> Why do you need a label in any case?

Remove the mfd, use act8945a@5b.

> 
> > +		compatible = "active-semi,act8945a";
> > +		reg = <0x5b>;
> > +		status = "okay";
> > +	};
> 
> This doesn't look much like an MFD to me.

I will add the child nodes for its sub devices, inclusive pmic and charger nodes.

> 
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source
> software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog


Best Regards,
Wenyou Yang