From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5A43D3A3E7F; Wed, 13 May 2026 19:47:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778701661; cv=none; b=A9mCTPlfowRVB3fIOCAlg8N1r9K2sNZBq1IIeVl5yLyXr7YGsDnNiuSp8DOxWhtnarPHJH65hRUXHkviVsfXg1lBwaDZSHKXeK3NtCZUdDb+PlaZFXTaN7wq2ujAflEO9QyAKmHrq3V+pTQ8du+kymcOEMyNCMhzUiFI2lLJTKk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778701661; c=relaxed/simple; bh=rrQKK03WIh8RzNQzNNWa6G/QbwuSw5FsrXzHFJ5OZP4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=kSoTupyHG5TWp0Stf8ged59Rf/4+hFqqCjMXBMi89xU0rjI1A0dKj5eJwvMQM8q8BSkcq5XbaN3nt7Rrt3++7Rn/hTnoCpuWNg2VhmRMzJ5f8083idwKsbcrf/u7Ll2pyza8m3ADEQHffN5r/cShzktvQ/mRXvV6tP9CJzQ16u0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bN/HiWZf; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bN/HiWZf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3D9F0C19425; Wed, 13 May 2026 19:47:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778701661; bh=rrQKK03WIh8RzNQzNNWa6G/QbwuSw5FsrXzHFJ5OZP4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=bN/HiWZfchkfVCMz6r6hXBjLdJUzCz9l8i5iQi7jF9IRwIfKnQOCND+WB6AnKmgGm eRJMCB/EALxc12F6qoqhfFRIwTqmLdARf/fEAMkWptJ29Dn7kmlcE0Ulktb8iRsxZi 8KIlACcQDULnRO+SfGm1LEIkexQysdDzMsMwMl1BbT+6kaQTKhiECjfKeqwZVmYDaZ StbCV5ENh+L1X2N1p4+7asgk5QNNMxVRmrwbzv6ejlagd9R+ifoCsWh/puaoWFhbhz lSFPfwQY210eF2Ti7QxWycBNlMrl9iAYNyOKEOFF1X/aOQdOddnCt6lwFDwPQrGJBc x5z7nLd7yXnpQ== Message-ID: <16e82bc7-7c19-461a-8c5e-9dfc5e91a2b9@kernel.org> Date: Wed, 13 May 2026 21:47:35 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/3] dt-bindings: PCI: imx6q-pcie: Add intr, aer and pme interrupts To: "mani@kernel.org" , Hongxing Zhu Cc: "robh@kernel.org" , "krzk+dt@kernel.org" , "conor+dt@kernel.org" , "bhelgaas@google.com" , Frank Li , "l.stach@pengutronix.de" , "lpieralisi@kernel.org" , "kwilczynski@kernel.org" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" , "festevam@gmail.com" , "linux-pci@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "devicetree@vger.kernel.org" , "imx@lists.linux.dev" , "linux-kernel@vger.kernel.org" References: <20260430050954.3467984-1-hongxing.zhu@nxp.com> <20260430050954.3467984-2-hongxing.zhu@nxp.com> <20260430-proud-ammonite-of-gaiety-abaafc@quoll> <55258a51-9cdb-451c-be06-74b9b3020cbc@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 12/05/2026 15:26, mani@kernel.org wrote: >>>>>> >>>>>> These interrupts are optional for existing variants (imx6q, imx6sx, >>>>>> imx6qp, imx7d, imx8mq, imx8mm, imx8mp) to maintain backward >>>>>> compatibility with existing device trees. >>>>>> >>>>>> For fsl,imx95-pcie, all 5 interrupts (msi, dma, intr, aer, pme) are >>>>>> mandatory due to hardware requirements. >>>>>> >>>>>> This introduces an ABI requirement for fsl,imx95-pcie. The i.MX95 >>>>>> hardware requires dedicated interrupt lines for AER, PME, and >>>>>> general controller events due to its redesigned interrupt >>>>>> architecture. i.MX95 cannot function correctly without explicit >>>>>> interrupt routing for error handling, power management and link event >>> detection. >>>>> >>>>> fsl,imx95-pcie was added more than two years ago, so how it cannot >>>>> function correctly? Are you saying that for two years you had here >>>>> completely broken code? >>>>> >>>>> If this wasn't tested for two years, how can we believe anything is tested now? >>>> The basic PCIe functionality has been working since the initial >>>> fsl,imx95-pcie support. However, AER (Advanced Error Reporting) and >>>> link up/down detection were not previously enabled. This patch-set >>>> adds and verifies support for these advanced features. >>>> >>> >>> That is not what you said in the commit msg. >> Hi Krzysztof: >> Sorry for the delayed response due to a holiday. >> After reviewing this patch-set again, I'd like to suggest an alternative >> approach: would it be possible to mark these newly added interrupts as >> optional? > > Yes, since even without these interrupts, PCIe functionality still works. Only > issue is that it cannot report error and recover from LDn. Yes. Please mention how the hardware or SW implementation behave when these are missing, which is then serving as proof why they can be optional. Best regards, Krzysztof