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

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Date:	Tue, 29 Oct 2013 17:31:47 +0200
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Josh Cartwright <joshc@...eaurora.org>
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


Hi,

On Tue, 2013-10-29 at 10:05 -0500, Josh Cartwright wrote: 
> 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).
> 

Ok. Thanks for clarification.

Regards,
Ivan



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