linux-kernel - Re: [PATCH v3 09/10] mfd: pm8x41: document device tree bindings

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Date:	Tue, 29 Oct 2013 10:05:46 -0500
From:	Josh Cartwright <joshc@...eaurora.org>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	Sagar Dharia <sdharia@...eaurora.org>,
	Gilad Avidov <gavidov@...eaurora.org>,
	Michael Bohan <mbohan@...eaurora.org>
Subject: Re: [PATCH v3 09/10] mfd: pm8x41: document device tree bindings

On Tue, Oct 29, 2013 at 04:18:35PM +0200, Ivan T. Ivanov wrote:
> On Mon, 2013-10-28 at 13:12 -0500, Josh Cartwright wrote: 
> > Document the bindings used to describe the Qualcomm 8x41 PMICs.
> > 
> > Signed-off-by: Josh Cartwright <joshc@...eaurora.org>
> > ---
> >  Documentation/devicetree/bindings/mfd/pm8x41.txt | 33 ++++++++++++++++++++++++
> >  1 file changed, 33 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/mfd/pm8x41.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/mfd/pm8x41.txt b/Documentation/devicetree/bindings/mfd/pm8x41.txt
> > new file mode 100644
> > index 0000000..6afd4ce
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mfd/pm8x41.txt
> > @@ -0,0 +1,33 @@
> > +Qualcomm PM8841 and PM8941 PMIC multi-function devices
> > +
> > +The PM8x41 PMICs are used with the Qualcomm Snapdragon 800 series SoCs, and are
> > +interfaced to the chip via the SPMI (System Power Management Interface) bus.
> > +Support for  multiple independent functions are implemented by splitting the
> > +16-bit SPMI slave address space into 256 smaller fixed-size regions, 256 bytes
> > +each.  A function can consume one or more of these fixed-size register regions.
> > +
> > +Required properties:
> > +- compatible: Must be one of:
> > +     "qcom,pm8841"
> > +     "qcom,pm8941"
> > +- reg: Specifies the SPMI USID slave address for this device
> > +- #address-cells = <1>
> > +- #size-cells = <0>
> > +
> > +Each child node represents a function of the PM8x41.  Each child 'reg' entry
> > +describes an offset within the USID slave address where the region starts.
> > +
> > +Example:
> > +
> > +pm8941@0 {
> > +	compatible = "qcom,pm8941";
> > +	reg = <0x0>;
> > +
> > +	#address-cells = <1>;
> > +	#size-cells = <0>;
> > +
> > +	rtc {
> > +		compatible = "qcom,pm8941-rtc";
> > +		reg = <0x6000 0x6100>;
> 
> This doesn't look right. Probably #size-cells have to be <1>?

Some functions of the PMIC actually consume more than one fixed-size
region of the slave address space.  This example is showing one such
peripheral (consuming the region starting at 0x6000 and another at
0x6100).

-- 
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