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Fri, 10 Jul 2026 02:49:57 -0700 (PDT) X-Received: by 2002:a05:6214:27c6:b0:8fd:c3a0:3276 with SMTP id 6a1803df08f44-8fec8afd64bmr91167556d6.10.1783676996924; Fri, 10 Jul 2026 02:49:56 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-69a19ce4b4fsm10518512a12.10.2026.07.10.02.49.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jul 2026 02:49:55 -0700 (PDT) Message-ID: <298bd947-6957-4a04-afb3-a6394f05a506@oss.qualcomm.com> Date: Fri, 10 Jul 2026 11:49:52 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 3/5] arm64: dts: qcom: kaanapali: bind traceNoC on the platform bus To: Jie Gan , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Tingwei Zhang , Jingyi Wang , Abel Vesa , Suzuki K Poulose , Mike Leach , James Clark , Leo Yan , Yuanfang Zhang , Abel Vesa , Alexander Shishkin Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org References: <20260710-fix-tracenoc-probe-issue-v6-0-41eb36fef8d9@oss.qualcomm.com> <20260710-fix-tracenoc-probe-issue-v6-3-41eb36fef8d9@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260710-fix-tracenoc-probe-issue-v6-3-41eb36fef8d9@oss.qualcomm.com> Content-Type: text/plain; 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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: f73959d86c15 ("arm64: dts: qcom: kaanapali: add coresight nodes") > Signed-off-by: Jie Gan > --- Reviewed-by: Konrad Dybcio Konrad