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SubjectRe: [PATCH 1/3] arm64: dts: qcom: sdm845: Add Coresight support
On Sat, Jan 12, 2019 at 06:21:00PM +0530, saiprakash.ranjan@codeaurora.org wrote:
> Hi Mathieu,
>
> > > +
> > > + etm@7040000 {
> > > + compatible = "arm,coresight-etm4x", "arm,primecell";
> > > + arm,primecell-periphid = <0x000bb95d>;
> >
> > I'm a little curious as to why you need to bypass the normal AMBA bus
> > discovery
> > method by forcing the peripheral ID. Tracers don't show up the way
> > other
> > coresight devices do at boot time?
> >
>
> Yes on some Qcom SoC's like SDM845 and also on some previous ones, for
> ETM(only) amba bus discovery method fails because of wrong pid read from the
> registers. So we have to force this primecell peripheral ids to probe etm.

Ok, if that is the case please add a comment to explain the situation.
Otherwise someone will assuredly ask again in the future.

Mathieu


>
> - Sai
>
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of
> Code Aurora Forum, hosted by The Linux Foundation

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