linux-kernel - Re: [PATCH v2 05/11] mfd: devicetree: bindings: Add Qualcomm SMD based RPM DT binding

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Message-ID: <20150727105853.GA21114@x1>
Date:	Mon, 27 Jul 2015 11:58:53 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	"bjorn@...o.se" <bjorn@...o.se>,
	Andy Gross <agross@...eaurora.org>,
	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>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v2 05/11] mfd: devicetree: bindings: Add Qualcomm SMD
 based RPM DT binding

On Mon, 27 Jul 2015, Mark Brown wrote:

> On Mon, Jul 27, 2015 at 08:29:18AM +0100, Lee Jones wrote:
> > On Fri, 24 Jul 2015, Mark Brown wrote:
> > > On Fri, Jul 24, 2015 at 11:24:34AM +0100, Mark Brown wrote:
> 
> > From here:
> 
> > > > > > > +                pm8941-regulators {
> > > > > > > +                        compatible = "qcom,rpm-pm8941-regulators";
> > > > > > > +                        vdd_l13_l20_l23_l24-supply = <&pm8941_boost>;
> 
> > > > > > I'd like Mark to glance at this.
> 
> > Mark: Is this new property okay?
> 
> As far as I can see that looks like a standard supply property, assuming
> the supply is actually called that why would it be an issue?
> 
> > > The specified range of the regulator is 1.75-1.85V and this is handled
> > > by the implementation, however the board designers have stated that it
> > > is only allowed to be configured to 1.8V.
> 
> > > So DT is used to narrow the capabilities of the individual component to
> > > something that's suitable for this particular system.
> 
> > > > We still need Mark to look at this.
> 
> > Is it okay for the regulator-{min,max}-microvolt to be artificially
> > restricted to the required value, despite knowing that the regulator
> > is capable of supply {more,less} voltage?
> 
> Yes, that's the entire purpose of those properties - to set the limits
> the board designers have which will typically be more restrictive than
> those that the regulator itself is capable of imposing.

All fine then.

Please re-submit with the changes we discussed.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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