linux-kernel - Re: [PATCH v7 1/3] mfd: devicetree: bindings: Add Qualcomm RPM DT binding

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Message-ID: <20140930162541.GQ28481@sonymobile.com>
Date:	Tue, 30 Sep 2014 09:25:42 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Kumar Gala <galak@...eaurora.org>
CC:	Rob Herring <robh+dt@...nel.org>, Mark Brown <broonie@...nel.org>,
	Lee Jones <lee.jones@...aro.org>,
	Pawel Moll <pawel.moll@....com>,
	Andy Gross <agross@...eaurora.org>,
	Mark Rutland <mark.rutland@....com>,
	Kevin Hilman <khilman@...aro.org>,
	Josh Cartwright <joshc@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v7 1/3] mfd: devicetree: bindings: Add Qualcomm RPM DT
 binding

On Tue 30 Sep 09:02 PDT 2014, Kumar Gala wrote:

> 
> On Sep 30, 2014, at 10:28 AM, Bjorn Andersson <Bjorn.Andersson@...ymobile.com> wrote:
> 
> > On Wed 24 Sep 09:39 PDT 2014, Kumar Gala wrote:
> > 
> >> 
> >> On Sep 22, 2014, at 6:25 PM, Bjorn Andersson <Bjorn.Andersson@...ymobile.com> wrote:
> >> 
> > 
> > [..]
> > 
> >>> diff --git a/Documentation/devicetree/bindings/mfd/qcom-rpm.txt b/Documentation/devicetree/bindings/mfd/qcom-rpm.txt
> > 
> > [..]
> > 
> >>> +- qcom,ipc:
> >>> +     Usage: required
> >>> +     Value type: <prop-encoded-array>
> >>> +
> >>> +     Definition: three entries specifying the outgoing ipc bit used for
> >>> +                 signaling the RPM:
> >>> +                 - phandle to a syscon node representing the apcs registers
> >>> +                 - u32 representing offset to the register within the syscon
> >>> +                 - u32 representing the ipc bit within the register
> >>> +
> >> 
> >> Does this really ever differ for the SoCs, and even if it does why do we need
> >> to encode it in DT.  Can’t we determine it via the compatible setting?
> >> 
> > 
> > The two offsets could be hard coded, especially based on the compatible.
> > 
> > But I don't know if it's worth respinning this just to get those two number out
> > of here. Also this is now "symmetric" with the smd use cases, where it
> > shouldn't be hard coded.
> 
> I do think its worth respinning until the DT is agreed to as we shouldn’t
> be changing the binding.
> 

Correct, if there's valid reason for it.

> I’m not sure how being ‘symmetric’ with the smd use case maters if
> we are treating this RPM support vs RPM-SMD as two different things.
> 

Not rpm-smd but smd. Which is also used on family a and uses the same kpss-gcc
(or apcs) node as rpm for outgoing ipc on those platforms.

Regards,
Bjorn
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