From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6B9C3C43458 for ; Wed, 1 Jul 2026 07:26:53 +0000 (UTC) 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:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=VR+btw8x/INiJh4wFSlSi+fyCAWK2CUT+WR0dWLATNY=; b=IrhMByO8nZ2zPYA0Zb72v6LTCt pkFLJmzhLlTc6gKTPFAwsdfa/j7WLF7VefRD+ORm9KECi+gHcOP1N+2MfJcXV3Dq8Rys9JgS75PJF KnA6/4WT+T5EgrHFjUifgEien2LVwzTqisNoX9nuAZVViaIK+BNVn9lmpMbKKSL/waMj1UCZ2rDzM 2yBDQZs2Llxz7zdH9RFxX8DochZThzUUsEWtMLjRv9sf3PUe3O2QvKB6jm4esqQJdyBn4xMVw58Tp BfzuSzFRkoguOOnLX2OGpyRKIxNcZ6mQ+NvqXc5wt18qD6Y9j5qmjsZtclaUDkVAaidrrQsBtmwmN 2Uy1vNSw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wepLJ-00000000tdU-3fYN; Wed, 01 Jul 2026 07:26:46 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wepLI-00000000tdN-3jC3 for linux-arm-kernel@lists.infradead.org; Wed, 01 Jul 2026 07:26:45 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 4AEB8600AB; Wed, 1 Jul 2026 07:26:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1507B1F000E9; Wed, 1 Jul 2026 07:26:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782890804; bh=VR+btw8x/INiJh4wFSlSi+fyCAWK2CUT+WR0dWLATNY=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=G3quv6H4EEwyA9Oc2z4S3RPdydgyiN36/QGLUNleMVbE0zdFbx8VX+KWCBr+rLvXJ HCfQaN7JjgYuIbNpR130T5y0Z9Cq6V5J4s+ulwNtR6kRC+SskVv9wsgapKBxu3p8CO 4vP9SRJ9jSetQgpmkVPNMEfKAbmrIxhrVIEskAkLyIT2WY93lP4n1iL5XCe3r+56nt GbOrSgfAjsgdJZMTCqAg9uxlYI/eJLSi9IJO2JLd7pM22kDh3gWaaU6DNl+q5Ojr47 s1+886oqigaVF0+hWwIIB8qId0RrOi1Hyrc+El3PP28ZbSXNlcCs2/vvXRuie9iEBD 5w5lAWx04y62g== Message-ID: <9aa63427-ba41-436d-ab19-a533082d336a@kernel.org> Date: Wed, 1 Jul 2026 09:26:34 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/5] dt-bindings: arm: coresight-tnoc: Add standalone qcom,coresight-agtnoc compatible To: Jie Gan Cc: 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 , Konrad Dybcio , 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: <20260701-fix-tracenoc-probe-issue-v4-0-aefab449a470@oss.qualcomm.com> <20260701-fix-tracenoc-probe-issue-v4-1-aefab449a470@oss.qualcomm.com> <20260701-stirring-piculet-of-vastness-a361e5@quoll> <4117c406-0d75-4eb1-842e-1d346b7fbf99@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 01/07/2026 09:16, Jie Gan wrote: > > > On 7/1/2026 2:57 PM, Krzysztof Kozlowski wrote: >> On Wed, Jul 01, 2026 at 09:53:41AM +0800, Jie Gan wrote: >>> The TNOC compatible previously only allowed the two-string AMBA form >>> "qcom,coresight-tnoc", "arm,primecell", which forces the device onto the >>> AMBA bus. >>> >>> Convert the compatible to a oneOf and add a standalone >>> "qcom,coresight-agtnoc" compatible alongside the existing AMBA form. The >>> standalone string carries no "arm,primecell" entry, so the device is >>> created on the platform bus instead of the AMBA bus. >> >> That's a Linux driver specific reason, so not a valid one. >> >> Describe the hardware instead. >> >> Also, you do not get other compatible for the same device. > > The device is intended to be discovered and probed via the AMBA bus. > However, due to a hardware issue, AMBA probing does not work correctly. > While adding the arm,primecell-periphid property would allow the If this is not AMBA bus device, then drop primecell compatible. > existing AMBA driver to bind, but I think that's a temp WA. As > Suzuki/Leo pointed out, we should not add the property to pretend the > device as an AMBA device. > > Instead, I introduced a dedicated compatible string so the device can be > handled by the existing platform driver without relying on the missing As I said, that's a Linux driver specific reason, so not a valid one. Fix your drivers if you insist on that. > AMBA primecell identification. The purpose of the new compatible is to > clearly distinguish this platform-specific case from the standard > AMBA-based implementation. Or shall I re-use the existing compatible > "qcom,coresight-tnoc" as platform standalone compatible? > > We already have a similar pattern for the interconnect TraceNoC device, > which uses the platform-specific compatible string qcom,coresight-itnoc. I do not see there a fake, duplicated compatible for the same device. Can you elaborate how is that relevant? Best regards, Krzysztof