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 27E49D0EE05 for ; Fri, 11 Oct 2024 15:44:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id: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=C/LlrrKS2zEXw8O+xIfNzxk5mhyb7BZH44kcMn8KF+0=; b=Az12ZN7tUY+aVz YoLwWF0f0l6comvBuilDs24i53Dq7UEJ8VIXJh/oOsOVZf8kBj9tnMQz2zqOLVYC4twN/Ct11gvb4 OSJazOwGa+1CK7/jA0hNlOeRa44MZAhX5bjnUHQiISMAGA6VZpmhZoFt2EsQctq2q0ViPIaqOIXIO KhXPiG5sKgekMug//eabswb/dMRQh1iODNLRMLDlHfTKbPY3Wcfuo85NQXuY+96lfQQqFPmAKk8N0 XJG0QB2po0BK//rUJbjXKPm9QyZJLRbjwGSm0qJVpXD4cyi6dki7bFVyPRbdfZw2cb5AV4hro8yBw bkuiZSBZeR8LiZ7jtXwA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1szHop-0000000Gr5x-3i6t; Fri, 11 Oct 2024 15:44:43 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1szHon-0000000Gr5M-3aYD for linux-phy@lists.infradead.org; Fri, 11 Oct 2024 15:44:43 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 420B7A436A1; Fri, 11 Oct 2024 15:44:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6AB46C4CEC3; Fri, 11 Oct 2024 15:44:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728661480; bh=5/y9AyZw/R3ZOSr7RfPFOAOHH7Jry8D1rgUwHlE0tCk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ZU8g/ErzjCWLcSBaAHHaLF4bm0XsM3NVh3HwJ/iP5HPOI4ctHmWGIGv8QQDmOphJH KMtx165guLEZ95BCqKC/TmhxFUtPHcfTaXAgX28PNydXzvZarmpxSoZfZ4oAjMSJSI J1dbbngHwmcmjbKGNU/LS6eSwjrnRyw+EqEvjSfb89ptnmAgf3n6Gvb82g5JBBz2OV 9hXtkodDQ5anutmLR8KOrcx2kJAf19aYkVrPKzjadumKgdF2clZ1Q6iPpqqV336cI0 furZ9lsSMuUKieycVmqQVNPT93Y/iTCDKw0/Nls8P6oP4j++hSxewq8dmoMjAvlvkD qifxIJSGJjS3A== Message-ID: <3d1d0822-da66-44c8-a328-69804210123c@kernel.org> Date: Fri, 11 Oct 2024 17:44:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 3/8] dt-bindings: PCI: qcom,pcie-x1e80100: Add 'global' interrupt To: Manivannan Sadhasivam , Qiang Yu Cc: vkoul@kernel.org, kishon@kernel.org, robh@kernel.org, andersson@kernel.org, konradybcio@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, mturquette@baylibre.com, sboyd@kernel.org, abel.vesa@linaro.org, quic_msarkar@quicinc.com, quic_devipriy@quicinc.com, dmitry.baryshkov@linaro.org, kw@linux.com, lpieralisi@kernel.org, neil.armstrong@linaro.org, linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org References: <20241011104142.1181773-1-quic_qianyu@quicinc.com> <20241011104142.1181773-4-quic_qianyu@quicinc.com> <4802B12B-BAC1-4E99-BDFE-A2340F4A8F24@linaro.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org On 11/10/2024 17:42, Manivannan Sadhasivam wrote: > > > On October 11, 2024 8:03:58 PM GMT+05:30, Krzysztof Kozlowski wrote: >> On Fri, Oct 11, 2024 at 03:41:37AM -0700, Qiang Yu wrote: >>> Document 'global' SPI interrupt along with the existing MSI interrupts so >>> that QCOM PCIe RC driver can make use of it to get events such as PCIe >>> link specific events, safety events, etc. >> >> Describe the hardware, not what the driver will do. >> >>> >>> Though adding a new interrupt will break the ABI, it is required to >>> accurately describe the hardware. >> >> That's poor reason. Hardware was described and missing optional piece >> (because according to your description above everything was working >> fine) is not needed to break ABI. >> > > Hardware was described but not completely. 'global' IRQ let's the controller driver to handle PCIe link specific events like Link up, Link down etc... They improve user experience like the driver can use those interrupts to start bus enumeration on its own. So breaking the ABI for good in this case. > >> Sorry, if your driver changes the ABI for this poor reason. >> > > Is the above reasoning sufficient? I tried to look for corresponding driver change, but could not, so maybe there is no ABI break in the first place. Above explanation is good, but still feels like improvement and device could work without global clock. Best regards, Krzysztof -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy