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=1794429806; b=On6yGLn7llKN4Fdeh+HajBYufbAwEC+YA45GeLetj4Vk2YauM9xgfNV/E26v3F4w00XM heb+0QpV2wzi1SXWkHGS5GAZwaMcUGoyoPJkYXZdaMfIcUbRdGb/PCLMc1pa6hcKF4zpR gygZGm52y4MUGsQ5c5raVybHNymkCCyiOhlkPbx8X9yW2o0b7DKYPNqdLN5ZMxpKTFItL jKas8d9tpgqojH7+wSN3j+Vj9g1i1dTRy1XxZk/b6Aic9jy8q0llwPqjx6WcqoCS3UWZp 5iF8ARsgmq2aegT/W4Ib9GQso7597+WClZQOX/WKfTfydaZX4eMS6azKEdpf34sDjng== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794429806; h=DMARC-Filter:Received:Received:DKIM-Signature:Date:From:To:Cc: Subject:Message-ID:References:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; bh=YkiuKwTzFaKxocYqHbZJaiH6LJSy5oJp9dJAcEhaIF0=; b=C1geta5v4tnpamtMVQEzyxHyXVJBSK1vpfgHuudaNSJgL4MTyOEP3eauDHcJ4D2k42nz W2cIDbDRWAaaQha5txn05l2WN10/QYkEaciCWhG7OZDF5TABVpyWz94IZOWGyqqT0jFLY NdBG1MTWh4Bq6znvvDzw8N4OvJgs0H+b9l16FsfpLdf2Ls1gEU9V+mHA0543UMCFgE6eh Oh25tldA3WcoSMQhz5ZsMZufyqMwH8FplMLf/rZ4ioAGyfYGlnwH07h3pmco8HzGUfKTX 17295J21ZnMFEQDYpt+x6RL1B4TpoijUx9zQA2uHRAQyHdgUDmJcFzzXBtaaCVBdQAA== 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=nwawK37F; 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 1982B606A326; Wed, 11 Nov 2026 20:43:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 1982B606A326 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) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=nwawK37F 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 41A64153B; Wed, 11 Nov 2026 12:43:22 -0800 (PST) Received: from localhost (unknown [10.2.196.114]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D12223F85F; Wed, 11 Nov 2026 12:43:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1794429805; bh=mx3VbQ9/b7aZO8Gcx1adUQM+AmPwFj6BLz1d9u/uU8U=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=nwawK37Fkk3B1Dd8xpjDH02kguU+B9x/ZRaD5YNvyMo74wCWalB0GpoJEeLPKJE86 31HnfzhNse3dMDQrgcPdcaEiu7fOuN33UNqHb/5GPmekgyGPYeGmqNaT+5QEIdipZn FwgeBshyJewJ+AFuAZMFCFOSPHuewTnmyAlPLNyA= Date: Wed, 11 Nov 2026 20:43:22 +0000 From: Leo Yan To: Rob Herring Cc: Jie Gan , Suzuki K Poulose , Mike Leach , James Clark , 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 Subject: Re: [PATCH v7 0/5] Fix traceNoC probe issue on multiple QCOM platforms Message-ID: <20261111204322.GH9176@e132581.arm.com> References: <20261110-fix-trace-noc-probe-issue-v7-0-2f06905c77fe@oss.qualcomm.com> <20261110154643.GA4159803-robh@kernel.org> 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 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261110154643.GA4159803-robh@kernel.org> On Tue, Nov 10, 2026 at 09:46:43AM -0600, 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. Looking back at the earlier discussion [1], Jie in v2 already proposed "arm,primecell-periphid". Questions about AMBA IDs and ATID handling got mixed together. The series later moved towards platform-device probing, then became current shape. Hope we make the right decision on arm,primecell-periphid this time. Anyway, I'd like to apologise to Jie for all the back and forth. Thanks, Leo [1] https://lore.kernel.org/linux-arm-kernel/9432df20-08bf-4134-b4b9-e6b5d618af81@oss.qualcomm.com/