[PATCH v6 4/5] arm64: dts: qcom: sm8750: bind traceNoC on the platform bus

[Jie Gan]

The traceNoC node used the "qcom,coresight-tnoc", "arm,primecell"
compatible, which places the device on the AMBA bus. To bind an AMBA
device, the bus reads the peripheral and component ID registers (PID/CID)
at the top of the device's register block and matches them against the
primecell ID. The traceNoC exposes the CID registers, but the Component ID
value returned by the hardware is 0x00000000 instead of a valid AMBA
Component ID, so the match never succeeds, the AMBA probe fails, and the
device is left stuck in deferred probe indefinitely.

Drop the "arm,primecell" entry and use the standalone "qcom,coresight-tnoc"
compatible, which binds via the platform driver by compatible string and
does not rely on the component ID register at all. This lets the device
probe on hardware that does not return a valid CID, while remaining an
Aggregator TNOC that retains ATID functionality.

Fixes: ebd1eb365cae ("arm64: qcom: dts: sm8750: add coresight nodes")
Signed-off-by: Jie Gan <jie.gan@xxxxxxxxxxxxxxxx>
---
 arch/arm64/boot/dts/qcom/sm8750.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/sm8750.dtsi b/arch/arm64/boot/dts/qcom/sm8750.dtsi
index fafed417c66f..1e25be41aef5 100644
--- a/arch/arm64/boot/dts/qcom/sm8750.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8750.dtsi
@@ -4687,7 +4687,7 @@ tpdm_rdpm_cmb2_out: endpoint {
 		};
 
 		tn@109ab000 {
-			compatible = "qcom,coresight-tnoc", "arm,primecell";
+			compatible = "qcom,coresight-tnoc";
 			reg = <0x0 0x109ab000 0x0 0x4200>;
 
 			clocks = <&aoss_qmp>;

-- 
2.34.1