linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: Add msm8916 CoreSight components

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Date:	Fri, 8 May 2015 19:00:53 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>
Cc:	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Kumar Gala <galak@...eaurora.org>,
	Pratik Patel <pratikp@...eaurora.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.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 2/2] arm64: dts: qcom: Add msm8916 CoreSight components

On Fri, May 08, 2015 at 02:47:57PM +0100, Ivan T. Ivanov wrote:
> 
> On Fri, 2015-05-08 at 07:38 -0600, Mathieu Poirier wrote:
> > On 7 May 2015 at 09:36, Ivan T. Ivanov ivanov@...aro.org> wrote:
> > > Add initial set of CoreSight components found on Qualcomm's 8x16 chipset.
> > > 
> > > 
> > > +       replicator@...000 {
> > > +               compatible = "qcom,coresight-replicator", "arm,primecell";
> > 
> > Shouldn't it be "qcom,coresight-replicator1x" ?
> > 
> 
> 
> 
> True, I still wonder, why we have to have this compatible string? 
> Drivers are probed by amba_id and "arm,primecell", after all.

The compatible string tells you both the device _and_ the format of the
other properties, because it tells you which binding applies.

So the compatible string should be present regardless, as
"arm,primecell" does not define the majority of the properties you need
for the replicator node.

Thanks,
Mark.
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