Re: [PATCH v2] arm64: dts: qcom: shikra: Switch CPU ETMs to MMIO-based probing

[Konrad Dybcio]

On 10/19/26 8:58 AM, Jie Gan wrote:
> The etm0-etm3 nodes are declared with "arm,coresight-etm4x-sysreg"
> but do not implement self-hosted system-register trace access on
> this SoC: ID_AA64DFR0_EL1.TraceVer reads as 0 on the affected CPUs,
> so etm4_init_sysreg_access() correctly reports the access mechanism
> as unavailable and the ETMv4 driver fails to probe with -EINVAL.
> 
> The CPU ETMs have a memory-mapped aperture, so switch each node to
> the standard "arm,coresight-etm4x", "arm,primecell" compatible with
> its MMIO reg range.
> 
> Fixes: eed738c6dd0c ("arm64: dts: qcom: shikra: Add coresight nodes")
> Signed-off-by: Jie Gan <jie.gan@xxxxxxxxxxxxxxxx>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>

Konrad