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

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Message-ID: <20150511110422.GA4595@leverpostej>
Date:	Mon, 11 May 2015 12:04:22 +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 07:17:12PM +0100, Ivan T. Ivanov wrote:
> 
> > On May 8, 2015, at 9:00 PM, Mark Rutland <mark.rutland@....com> wrote:
> > 
> > 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.
> 
> Mmm, only if vendors don’t bother to update version information
> fused to revision id registers, which happens. And this could 
> be workaround by "arm,primecell-periphid”, no?

No. That only tells you the identity of the device, not the format of
the binding.

Thanks,
Mark.
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