linux-kernel - Re: [PATCH 1/4] dt-binding: gpio: Add Qualcomm SMSM device tree documentation

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Message-ID: <20150901215029.GK13472@usrtlx11787.corpusers.net>
Date:	Tue, 1 Sep 2015 14:50:29 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Stanimir Varbanov <svarbanov@...sol.com>
CC:	Alexandre Courbot <gnurou@...il.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] dt-binding: gpio: Add Qualcomm SMSM device tree
 documentation

On Tue 01 Sep 01:18 PDT 2015, Stanimir Varbanov wrote:

> On 08/27/2015 08:37 PM, Bjorn Andersson wrote:
> > This documents a device tree binding for exposing the Qualcomm Shared
> > Memory State Machine as a set of gpio- and interrupt-controllers.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> > ---
> >  .../devicetree/bindings/gpio/qcom,smsm.txt         | 114 +++++++++++++++++++++
> 
> <snip>
> 
> > += EXAMPLE
> > +The following example shows the SMEM setup for controlling properties of the
> > +wireless processor, defined from the 8974 apps processor's point-of-view. It
> > +encompasses one outbound entry and the outgoing interrupt for the wireless
> > +processor.
> > +
> > +smsm {
> > +	compatible = "qcom,smsm";
> > +
> > +	#address-cells = <1>;
> > +	#size-cells = <0>;
> > +
> > +	qcom,ipc-3 = <&apcs 8 19>;
> 
> Can we use something more descriptive here, for example
> 
> qcom,ipc-rpm = <&apcs 8 19>;

Not really, because in the view of smsm we don't now which host the rpm
would represent. But most likely 3 would mean WCNSS, per the enum in
caf.

> 
> and replace these magic numbers with defines?
> 

I don't know what those defines would be named, what you have here is
bit 19 in the 8th byte - straight from the register documentation.

> > +
> > +	apps_smsm: apps@0 {
> > +		reg = <0>;
> > +
> > +		gpio-controller;
> > +		#gpio-cells = <2>;
> > +	};
> > +
> > +	wcnss_smsm: wcnss@7 {
> > +		reg = <7>;
> > +		interrupts = <0 144 1>;
> > +
> > +		interrupt-controller;
> > +		#interrupt-cells = <2>;
> > +	};
> > +};

Regards,
Bjorn
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