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SubjectRe: [PATCH 1/3] arm64: dts: qcom: sdm845: Add Coresight support
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Hi Mathieu,

On 1/14/2019 9:05 PM, Mathieu Poirier wrote:
> 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.
>

Sure, will add it in the next version.

Thanks,
Sai

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