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Date:   Tue, 15 Jan 2019 21:59:11 +0530
From:   Sai Prakash Ranjan <>
To:     Mathieu Poirier <>
Cc:     Mark Rutland <>,,
        Rajendra Nayak <>,
        Suzuki K Poulose <>,
        Alexander Shishkin <>,,,
        David Brown <>,
        Rob Herring <>,
        Sibi Sankar <>,
        Vivek Gautam <>,
        Leo Yan <>,
        Andy Gross <>,,
Subject: Re: [PATCH 1/3] arm64: dts: qcom: sdm845: Add Coresight support

Hi Mathieu,

On 1/14/2019 9:05 PM, Mathieu Poirier wrote:
> On Sat, Jan 12, 2019 at 06:21:00PM +0530, wrote:
>> Hi Mathieu,
>>>> +
>>>> +	etm@...0000 {
>>>> +		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.

Sure, will add it in the next version.


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