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 35DCE1BC58; Mon, 14 Oct 2024 09:27:06 +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=1728898027; cv=none; b=QXrcraUK+GsPMZ9F72TGrSTF2ksODEUJpXJFcqKouQrmIKRMIF6UPM7x9p3x2pAr5wM9Ey7lX88EPcLE/JZpOZT2T87XSzvs0vAtDotRk0WLXPFywqCEwMWPZLcx6WfFTPGmoZH1dOX6PpPw4tVOMp97NAE2aZD5UFvgnGxJInE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728898027; c=relaxed/simple; bh=bZzWmd0qp3uHykl1fDCJ+/1PxPT3TSrmX5yo9NoW7w0=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=gck8saa2k0VsZKsnF7yjWv9a+cv9AQXJq4GOsuLtwWLKyjDKsWDQxUkOzcYAoENNlUl1XwH95A/DLwm8Jv25kfgV39wE6Dpy6drWMocoemZseDv+tkN97T4PXtyFAvrNeYk54kBe5nkvQdrC2XHIOptismBHLaFpLH1j7Nj/NhA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XrtqWmIl; 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="XrtqWmIl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C291BC4CEC7; Mon, 14 Oct 2024 09:27:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728898026; bh=bZzWmd0qp3uHykl1fDCJ+/1PxPT3TSrmX5yo9NoW7w0=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=XrtqWmIlxzzxKh/e9gCSzDdubsL9B8h65KPj/iNCyTkTC+5aBp5JFKFCuwIBvqRZF g6J7WtxV14KgB0CTIBHtTDMlWzYZkIwtBYGl8sCqvxPE00a2SHeyN6aPaobbCWZ+61 r47FvjqOr0+qzwMT2o3fof/fVkOQo04hg3uB6h8etwzIKvc29aXOJuCfpLV45fMVbq ZXq7gGGQ2ZUj/yY5nw3gPcSjtE2b37nGvx7p+qnaEipWd9ISW9Oqo1+zcdn7RsQuZp oWB94hjXKAGsgS5eOC+ec3pQCniUm0vKepkBNIBFyAK4OWxoS/CAUzn/QJTKnbl+Kz TpJ125RqIt7ng== Message-ID: Date: Mon, 14 Oct 2024 11:26:58 +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 v6 3/8] dt-bindings: PCI: qcom,pcie-x1e80100: Add 'global' interrupt To: Manivannan Sadhasivam Cc: Qiang Yu , 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> <3d1d0822-da66-44c8-a328-69804210123c@kernel.org> <65B34B14-76C3-491D-8A58-6D0887889018@linaro.org> <20241014090251.r4sfaaxtasokv4oi@thinkpad> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; keydata= xsFNBFVDQq4BEAC6KeLOfFsAvFMBsrCrJ2bCalhPv5+KQF2PS2+iwZI8BpRZoV+Bd5kWvN79 cFgcqTTuNHjAvxtUG8pQgGTHAObYs6xeYJtjUH0ZX6ndJ33FJYf5V3yXqqjcZ30FgHzJCFUu JMp7PSyMPzpUXfU12yfcRYVEMQrmplNZssmYhiTeVicuOOypWugZKVLGNm0IweVCaZ/DJDIH gNbpvVwjcKYrx85m9cBVEBUGaQP6AT7qlVCkrf50v8bofSIyVa2xmubbAwwFA1oxoOusjPIE J3iadrwpFvsZjF5uHAKS+7wHLoW9hVzOnLbX6ajk5Hf8Pb1m+VH/E8bPBNNYKkfTtypTDUCj NYcd27tjnXfG+SDs/EXNUAIRefCyvaRG7oRYF3Ec+2RgQDRnmmjCjoQNbFrJvJkFHlPeHaeS BosGY+XWKydnmsfY7SSnjAzLUGAFhLd/XDVpb1Een2XucPpKvt9ORF+48gy12FA5GduRLhQU vK4tU7ojoem/G23PcowM1CwPurC8sAVsQb9KmwTGh7rVz3ks3w/zfGBy3+WmLg++C2Wct6nM Pd8/6CBVjEWqD06/RjI2AnjIq5fSEH/BIfXXfC68nMp9BZoy3So4ZsbOlBmtAPvMYX6U8VwD TNeBxJu5Ex0Izf1NV9CzC3nNaFUYOY8KfN01X5SExAoVTr09ewARAQABzSVLcnp5c3p0b2Yg S296bG93c2tpIDxrcnprQGtlcm5lbC5vcmc+wsGVBBMBCgA/AhsDBgsJCAcDAgYVCAIJCgsE FgIDAQIeAQIXgBYhBJvQfg4MUfjVlne3VBuTQ307QWKbBQJgPO8PBQkUX63hAAoJEBuTQ307 QWKbBn8P+QFxwl7pDsAKR1InemMAmuykCHl+XgC0LDqrsWhAH5TYeTVXGSyDsuZjHvj+FRP+ gZaEIYSw2Yf0e91U9HXo3RYhEwSmxUQ4Fjhc9qAwGKVPQf6YuQ5yy6pzI8brcKmHHOGrB3tP /MODPt81M1zpograAC2WTDzkICfHKj8LpXp45PylD99J9q0Y+gb04CG5/wXs+1hJy/dz0tYy iua4nCuSRbxnSHKBS5vvjosWWjWQXsRKd+zzXp6kfRHHpzJkhRwF6ArXi4XnQ+REnoTfM5Fk VmVmSQ3yFKKePEzoIriT1b2sXO0g5QXOAvFqB65LZjXG9jGJoVG6ZJrUV1MVK8vamKoVbUEe 0NlLl/tX96HLowHHoKhxEsbFzGzKiFLh7hyboTpy2whdonkDxpnv/H8wE9M3VW/fPgnL2nPe xaBLqyHxy9hA9JrZvxg3IQ61x7rtBWBUQPmEaK0azW+l3ysiNpBhISkZrsW3ZUdknWu87nh6 eTB7mR7xBcVxnomxWwJI4B0wuMwCPdgbV6YDUKCuSgRMUEiVry10xd9KLypR9Vfyn1AhROrq AubRPVeJBf9zR5UW1trJNfwVt3XmbHX50HCcHdEdCKiT9O+FiEcahIaWh9lihvO0ci0TtVGZ MCEtaCE80Q3Ma9RdHYB3uVF930jwquplFLNF+IBCn5JRzsFNBFVDXDQBEADNkrQYSREUL4D3 Gws46JEoZ9HEQOKtkrwjrzlw/tCmqVzERRPvz2Xg8n7+HRCrgqnodIYoUh5WsU84N03KlLue MNsWLJBvBaubYN4JuJIdRr4dS4oyF1/fQAQPHh8Thpiz0SAZFx6iWKB7Qrz3OrGCjTPcW6ei OMheesVS5hxietSmlin+SilmIAPZHx7n242u6kdHOh+/SyLImKn/dh9RzatVpUKbv34eP1wA GldWsRxbf3WP9pFNObSzI/Bo3kA89Xx2rO2roC+Gq4LeHvo7ptzcLcrqaHUAcZ3CgFG88CnA 6z6lBZn0WyewEcPOPdcUB2Q7D/NiUY+HDiV99rAYPJztjeTrBSTnHeSBPb+qn5ZZGQwIdUW9 YegxWKvXXHTwB5eMzo/RB6vffwqcnHDoe0q7VgzRRZJwpi6aMIXLfeWZ5Wrwaw2zldFuO4Dt 91pFzBSOIpeMtfgb/Pfe/a1WJ/GgaIRIBE+NUqckM+3zJHGmVPqJP/h2Iwv6nw8U+7Yyl6gU BLHFTg2hYnLFJI4Xjg+AX1hHFVKmvl3VBHIsBv0oDcsQWXqY+NaFahT0lRPjYtrTa1v3tem/ JoFzZ4B0p27K+qQCF2R96hVvuEyjzBmdq2esyE6zIqftdo4MOJho8uctOiWbwNNq2U9pPWmu 4vXVFBYIGmpyNPYzRm0QPwARAQABwsF8BBgBCgAmAhsMFiEEm9B+DgxR+NWWd7dUG5NDfTtB YpsFAmA872oFCRRflLYACgkQG5NDfTtBYpvScw/9GrqBrVLuJoJ52qBBKUBDo4E+5fU1bjt0 Gv0nh/hNJuecuRY6aemU6HOPNc2t8QHMSvwbSF+Vp9ZkOvrM36yUOufctoqON+wXrliEY0J4 ksR89ZILRRAold9Mh0YDqEJc1HmuxYLJ7lnbLYH1oui8bLbMBM8S2Uo9RKqV2GROLi44enVt vdrDvo+CxKj2K+d4cleCNiz5qbTxPUW/cgkwG0lJc4I4sso7l4XMDKn95c7JtNsuzqKvhEVS oic5by3fbUnuI0cemeizF4QdtX2uQxrP7RwHFBd+YUia7zCcz0//rv6FZmAxWZGy5arNl6Vm lQqNo7/Poh8WWfRS+xegBxc6hBXahpyUKphAKYkah+m+I0QToCfnGKnPqyYIMDEHCS/RfqA5 t8F+O56+oyLBAeWX7XcmyM6TGeVfb+OZVMJnZzK0s2VYAuI0Rl87FBFYgULdgqKV7R7WHzwD uZwJCLykjad45hsWcOGk3OcaAGQS6NDlfhM6O9aYNwGL6tGt/6BkRikNOs7VDEa4/HlbaSJo 7FgndGw1kWmkeL6oQh7wBvYll2buKod4qYntmNKEicoHGU+x91Gcan8mCoqhJkbqrL7+nXG2 5Q/GS5M9RFWS+nYyJh+c3OcfKqVcZQNANItt7+ULzdNJuhvTRRdC3g9hmCEuNSr+CLMdnRBY fv0= In-Reply-To: <20241014090251.r4sfaaxtasokv4oi@thinkpad> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 14/10/2024 11:02, Manivannan Sadhasivam wrote: > On Fri, Oct 11, 2024 at 06:06:02PM +0200, Krzysztof Kozlowski wrote: >> On 11/10/2024 17:51, Manivannan Sadhasivam wrote: >>> >>> >>> On October 11, 2024 9:14:31 PM GMT+05:30, Krzysztof Kozlowski wrote: >>>> 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. >>> >>> Here it is: >>> >>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4581403f67929d02c197cb187c4e1e811c9e762a >>> >>> Above explanation is good, but >>>> still feels like improvement and device could work without global clock. >> >> So there is no ABI break in the first place... Commit is misleading. >> > > It increases the 'minItems' to 9 from 8, how come it is not an ABI break? Interface changed but all known users are still working, right? "Break" means something does not work, something is affected. I might be missing here something, of course, but I simply do not see any affected user here. Best regards, Krzysztof