Re: [PATCH v2] arm64: dts: qcom: glymur: add coresight nodes

[Konrad Dybcio]

On 3/23/26 3:09 PM, Jie Gan wrote:
> 
> 
> On 3/23/2026 10:03 PM, Bjorn Andersson wrote:
>> On Mon, Mar 23, 2026 at 09:27:41PM +0800, Jie Gan wrote:
>>>
>>>
>>> On 3/23/2026 9:02 PM, Konrad Dybcio wrote:
>>>> On 3/23/26 1:30 PM, Jie Gan wrote:
>>>>>
>>>>>
>>>>> On 3/23/2026 7:05 PM, Konrad Dybcio wrote:
>>>>>> On 3/18/26 12:42 PM, Jie Gan wrote:
>>>>>>> Add CoreSight nodes to enable trace paths like TPDM->ETF/STM->ETF.
>>>>>>> These devices are part of the AOSS, CDSP, QDSS, PCIe5, TraceNoc and
>>>>>>> some small subsystems, such as GCC, IPCC, PMU and so on.
>>>>>>>
>>>>>>> Signed-off-by: Jie Gan <jie.gan@xxxxxxxxxxxxxxxx>
>>>>>>> ---
>>>>>>> Changes in V2:
>>>>>>> 1. removed two cti devices due to GFX block is down
>>>>>>
>>>>>> i.e. "because GPU is not yet enabled"?
>>>>>
>>>>> Yeah, these CTI devices have clock issue for enabling due to the GPU block is not yet enabled.
>>>>
>>>> Do they need the GPU to be online, or a clock from GPU_CC, or
>>>> maybe something else?
>>>
>>> We need a specific debug clock inside the GPU block. The debug clock only
>>> can be enabled while GPU is online.
>>
>> What happens once GPU has been delivered, but for some reason is
>> inactive and we try to use this CTI device?
> 
> We will check these devices again once GPU is available. We also will cross check with AOP team if there is a clock enable/disable requirement with the specific debug clock.

+Akhil for awareness, this is probably a solved problem downstream, but
I suppose this may be non-trivial with IFPC at play

Konrad