From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 783FB606A333 for ; Wed, 11 Nov 2026 15:07:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=InWB0LAk; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=VfZrepJ0 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Unsubscribe-Post:List-Owner; bh=IVSW7dlEtBAkMcVOOPixBHDjudsel8asjWSLmfExFeY=; b=InWB0LAkr++Bm4fc/M2T+8ZIFr g2w0q2TsC9mvGc7TVRZuQDge9GpzkuI1uX1kszteexm1CPEvjfqapm8RUGxtesH4GupjRu6z8ROTW M2lwqOkGmhNXnngt9mF/pTWcRqyYJFOdglwGnG/vYfCgXKGkjsdh0nd8OiUpIpJ0IxWtfXZf9Hanj Fyf52MJeaoqwn3WTdbsEOnR92iuAMeS81m37jGs9hdT3Yift9Prch3di2BGu6wqhZgn23QY9WB+WR demsFQQ+KQHLuQ7pxlNXrP5Qu/pj++j35RhNoZCZ0V3vI0od6LRkQzSOPkPhM49UuO1/KbKgV4hBC YjuXA59g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xR9vV-000000073IM-2Fhl; Wed, 11 Nov 2026 15:07:53 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xR9vS-000000073Hn-1640 for linux-arm-kernel@lists.infradead.org; Wed, 11 Nov 2026 15:07:52 +0000 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 3D8491576; Wed, 11 Nov 2026 07:07:44 -0800 (PST) Received: from localhost (unknown [10.2.196.114]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D2F9F3F632; Wed, 11 Nov 2026 07:07:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1794409667; bh=62Mu4OB+5wrqIV2cz1Z1/DAKB6v44So/0ueSDYAy0eM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=VfZrepJ0INs9KzNnKkWmxJLRps9nRBYmn6mnATtZK6oQjjzaP2Cyyx2TN1dldFmns KnTJe8UyD60giCl785gSW8Jmg3o+OmikZi0qe5odXs+y92IHy7hf9N4u3BnGiR7mLQ cTG6viDoj2FMuBt2iHZiJm0wx8HO+9LXwSRHRZbg= Date: Wed, 11 Nov 2026 15:07:44 +0000 From: Leo Yan To: Suzuki K Poulose Cc: Rob Herring , Jie Gan , 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: <20261111150744.GC9176@e132581.arm.com> References: <20261110-fix-trace-noc-probe-issue-v7-0-2f06905c77fe@oss.qualcomm.com> <20261110154643.GA4159803-robh@kernel.org> <14c0956c-904e-4a6a-98a0-882514d77b08@arm.com> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <14c0956c-904e-4a6a-98a0-882514d77b08@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261111_070750_344843_4054082C X-CRM114-Status: GOOD ( 17.05 ) X-Spam-Score: -4.4 (----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-5.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Wed, Nov 11, 2026 at 12:58:59PM +0000, Suzuki K Poulose wrote: > 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. This series preserves support AMBA driver probe, "arm,primecell" would continue to work. > That is true ! Sorry, I didn't think of the quirk. If adding "arm,primecell-periphid" property resolves the issue, I agree that updating the DTS nodes would be better way to resolve issue (for this case, anyway it requires to update DT blobs on broken platforms). Thanks, Leo