From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=217.140.110.172 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794401946; b=xHfSokhs6P9D8gm4E5yCQiXdAhhlbnc+jyvcaMESaZjn2kBzYlRn1bmQ0ZLIxkGbp71G XXZ1GE3nVNe15gllLlb13rxgnrp5H2DI91UiKAj+F5z1Ir206tjaDoc2IiCxRuzcs7ue1 eQdqKRkknnS0ZtW5JmD1qoqsd2jp/pOf7B1ljDw0723GB9Xa9zKdNSWIRg8Jl5laHUXmm 6V6Tjy9qeMzM2Qt5H6UNXaFzQLEjBfHiLJF8mJ90ThRoHHmsv1HMST7q9R1Ct664Zwr1X f3a0sGXSn420qJ4GOqUQ2dQm56S7YFvBHqVTxRorh6TPyXrlr+iyToOkIfoLoXltTGA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794401946; h=DMARC-Filter:Received:Received:DKIM-Signature:Message-ID:Date: MIME-Version:User-Agent:Subject:To:Cc:References:Content-Language: From:In-Reply-To:Content-Type:Content-Transfer-Encoding; bh=IFNXUO9Jr7TJnTM4pI8+RXJ3qfoW4xa5qsBB8IRLyHY=; b=KJCwqHdXIfuW9RSZ3omaB95cLS/T2OUqHPEhYbAwyt5IDDnGPNvaCZvhKRzTA+UiAXL5 W5DNjRpvYdoBMgydZSm1xE1aXtOf9kXLN9OBP4gMOoKPnvqcgtXR1MxpGqZJ4AkA9E/jf Dqj/p4Gy+c941T/3zZx4WO23V0ZSSoRrEdPlCyM1J4Ds1usZKPminrI5Qwd9NDDZQR9LP iL5RzXcC9rQwxbBzmtd4Sxm6K58hWEX3PrUtkC9dnlLCQTPcgQrOG6NGjqEjih0E6BEBJ VuORAk8OcfKqiLLN4ImDT2LDa4ZxVYlOJl/MfDKGXIRGljd9y34ZqYPJf7luBDDkqfw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=C0DwQSOz; arc=none smtp.remote-ip=217.140.110.172 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 7910F60A2614; Wed, 11 Nov 2026 12:59:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 7910F60A2614 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=C0DwQSOz Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 97E801576; Wed, 11 Nov 2026 04:59:00 -0800 (PST) Received: from [10.2.197.99] (ewhatever.cambridge.arm.com [10.2.197.99]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id B9DE83F632; Wed, 11 Nov 2026 04:59:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1794401943; bh=Cdy/qokJ1H5l2i4X0IPSgmP/Ge5RQRh04NlGw7FyG/U=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=C0DwQSOzO2O5bcR3VXJlOpuuJ9TPGqBenmbf9NmpLIwifpTSmMIcrDyG/aS3Od6UW IzrdOYaRBSikSpe8Z2mfLYIo5U7T/YAlenp3b3uPY1XJX0TrjklvzbGzlUVHjHpv7U 2qWTdIvBOwzT18Unl4VGC1N3sZHgfGpA5pC2leiY= Message-ID: <14c0956c-904e-4a6a-98a0-882514d77b08@arm.com> Date: Wed, 11 Nov 2026 12:58:59 +0000 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 0/5] Fix traceNoC probe issue on multiple QCOM platforms To: Rob Herring , Jie Gan Cc: Mike Leach , James Clark , Leo Yan , Krzysztof Kozlowski , Conor Dooley , Tingwei Zhang , Yuanfang Zhang , Alexander Shishkin , Bjorn Andersson , Konrad Dybcio , Abel Vesa , Jingyi Wang , linux-arm-msm@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Konrad Dybcio , Krzysztof Kozlowski References: <20261110-fix-trace-noc-probe-issue-v7-0-2f06905c77fe@oss.qualcomm.com> <20261110154643.GA4159803-robh@kernel.org> Content-Language: en-US From: Suzuki K Poulose In-Reply-To: <20261110154643.GA4159803-robh@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/11/2026 15:46, Rob Herring wrote: > On Tue, Nov 10, 2026 at 09:21:13AM +0800, Jie Gan wrote: >> The CoreSight TNOC (Trace Network-On-Chip) binding so far only allowed the >> two-string AMBA form "qcom,coresight-tnoc", "arm,primecell". That form >> forces the device onto the AMBA bus, where the driver must read the >> peripheral ID from the device registers during probe. On several QCOM >> platforms this AMBA peripheral-ID probing fails, so the traceNoC device >> never probes and its trace path is unavailable. > > But it works fine on some platforms? We have a property to override the > peripheral-ID which would solve your issue. That would be much simpler > and avoid the ABI break on any of the working platforms. That is true ! Sorry, I didn't think of the quirk. > > But this is already applied and it's not any platform I use, so I don't > really care. I am happy to revert these changes and let the DTS be fixed. Cheers Suzuki > > Rob