linux-kernel - Re: [PATCH 1/4] ARM: DT: apq8064: add rpm support

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Date:	Mon, 29 Sep 2014 22:02:04 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
CC:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"lee.jones@...aro.org" <lee.jones@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arm@...nel.org" <arm@...nel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 1/4] ARM: DT: apq8064: add rpm support

On Mon 29 Sep 15:17 PDT 2014, Stephen Boyd wrote:

> On 09/29/14 02:14, Srinivas Kandagatla wrote:
> > @@ -246,6 +247,24 @@
> >  			#reset-cells = <1>;
> >  		};
> >  
> > +		apcs: syscon@...1000 {
> > +			compatible = "syscon";
> > +			reg = <0x2011000 0x1000>;
> > +		};
> 
> This is actually a clock controller block that hw designers decided was
> good place to shove the ipc bits (because there's room!). Can we call it
> 
>                 l2cc: clock-controller@...1000 {
>                         compatible = "syscon";
>                         reg = <0x2011000 0x1000>;
>                 };
> 
> Eventually I'll add the specific krait compatible when we merge krait
> clock support:
> 
>                 l2cc: clock-controller@...1000 {
>                         compatible = "qcom,kpss-gcc", "syscon";
>                         reg = <0x2011000 0x1000>;
>                         clock-output-names = "acpu_l2_aux";
>                 };
> 

As long as we can get hold of the regmap that would be fine. I pressume the
idea is to have the kpss-gcc using syscon, just like the rpm. But hopefully the
syscon patches that are floating around (merged?) will allow any driver to
expose a "syscon regmap".

> > +
> > +		rpm@...000 {
> > +			compatible	= "qcom,rpm-apq8064";
> > +			reg		= <0x108000 0x1000>;
> > +			qcom,ipc = <&apcs 0x8 2>;
> 
> There are actually 3 ipc bits. I guess if we ever have to use the other
> two we'll extend this binding to have the other bits specified some
> other way?

I haven't seen any indications of us using more than this bit. If we want to do
that, we could simply make it <&apcs 8 2 &apcs 8 3 &apcs 8 4> (or whatever
those indices are). That way this should be easy it keep compatible.

Regards,
Bjorn
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