linux-kernel - Re: [PATCH 1/2] coresight: replicator: Add Qualcomm CoreSight Replicator driver

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Message-ID: <CANLsYkwhegfrnCbWk_o=3W26LNoAampFa+_TV4OLFFnm3SOszA@mail.gmail.com>
Date:	Thu, 30 Apr 2015 07:07:42 -0600
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>
Cc:	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>,
	Mark Rutland <mark.rutland@....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
Subject: Re: [PATCH 1/2] coresight: replicator: Add Qualcomm CoreSight
 Replicator driver

On 30 April 2015 at 01:21, Ivan T. Ivanov <ivan.ivanov@...aro.org> wrote:
>
> On Wed, 2015-04-29 at 10:28 -0600, Mathieu Poirier wrote:
>> On 29 April 2015 at 06:19, Ivan T. Ivanov ivanov@...aro.org> wrote:
>
> <snip>
>
>> >                 - "arm,coresight-etm4x", "arm,primecell";
>> > +               - "qcom,coresight-replicator", "arm,primecell";
>>
>> Is there some sort of versioning information we can add like it was
>> done for the "coresight-etmXY" bindings?  It makes things a lot
>> cleaner when a new (and possibly not backward compatible) version gets
>> released.
>>
>
> From what I can see, it is version 1. I could add it to compatible
> string, but suldn't we use amba_id for this reason.

amba_id work well for devices within the same family and compatible up
to a certain point.  When revisions change backward compatibility is
usually not kept and it becomes a nightmare to maintain.

>
>> >         * reg: physical base address and length of the register
>> >           set(s) of the component.
>> > diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
>> > index 6b331d4..165b681 100644
>> > --- a/drivers/hwtracing/coresight/Kconfig
>> > +++ b/drivers/hwtracing/coresight/Kconfig
>> > @@ -68,4 +68,13 @@ config CORESIGHT_SOURCE_ETM4X
>> >           instructions that a processor is executing. This is primarily useful
>> >           for instruction level tracing. Depending on the implemented version
>> >           data tracing may also be available.
>> > +
>> > +config CORESIGHT_QCOM_REPLICATOR
>> > +       bool "Qualcomm CoreSight Replicator driver"
>> > +       help
>> > +         This enables support for CoreSight link and sink driver that are
>> > +         responsible for transporting and collecting the trace data
>> > +         respectively. Link and sinks are dynamically aggregated with a trace
>> > +         entity at run time to form a complete trace path.
>>
>> The replicator is only a link entity.  It is only transporting trace
>> data information rather than collecting it.  Please review the
>> comment.
>
> True, sorry. copy and paste from CORESIGHT_LINKS_AND_SINKS.
>
>> Also, can this specific version run on both V7 and V8
>> architecture.  If not the proper "depends" should be added.
>>
>
> Same driver/device on both architectures.
>
> Will fix rest of the comments and will resend.
>
> Thank you,
> Ivan
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