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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uCbv9-0000000F66H-1jPw; Wed, 07 May 2025 10:22:35 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uCbcX-0000000F3fd-3ju8 for linux-phy@lists.infradead.org; Wed, 07 May 2025 10:03:23 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 5460343AAD; Wed, 7 May 2025 10:03:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 44473C4CEEB; Wed, 7 May 2025 10:03:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746612201; bh=Vja99RwKaWd86Bne8CVxoLF7hXa1qZ2hU2qWEbh3rTM=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=qiYVkYgsZJk1ojH2gUT0LuMkPaET6AsYf/tKwE/0NkUB43kU6qBoxjNwN00fGIvxT BDsNWC76g4TZw8L/HgeNyguw1F5vnOrFHOquk+1x5scGvDlx+PLRojlR8fOFLRl9uj ITq1FNep+ghls2iq7ojFYqD2EXPqBsM7FRADhnmYjdVhDUGkAZYamO1q9qXk+caIdL ZiCampwGUpIpbncLJsUrNJxgSQSIfFspt+5Goztwy8f6tbF65j8EMsSWXsanfyzP6Z iSN47YE511HkrBnFBRnmyccIxXsrYVO8w6j67aBFIRdmkxxATlvW8NjoIpF3+4d5ry 6IP5gkty3xcIA== Message-ID: <574a67b7-bd57-4cf4-9ecb-cdcefafeb791@kernel.org> Date: Wed, 7 May 2025 12:03:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 2/6] dt-bindings: PCI: qcom,pcie-sa8775p: document qcs8300 To: Qiang Yu , Ziyue Zhang Cc: vkoul@kernel.org, kishon@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, dmitry.baryshkov@linaro.org, neil.armstrong@linaro.org, abel.vesa@linaro.org, manivannan.sadhasivam@linaro.org, lpieralisi@kernel.org, kw@linux.com, bhelgaas@google.com, andersson@kernel.org, konradybcio@kernel.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, quic_krichai@quicinc.com, quic_vbadigan@quicinc.com References: <20250507031019.4080541-1-quic_ziyuzhan@quicinc.com> <20250507031019.4080541-3-quic_ziyuzhan@quicinc.com> <20250507-quixotic-handsome-wallaby-4560e3@kuoka> <8fef4573-0527-44d8-a481-f3271d9ffa33@quicinc.com> <01b06e36-823c-4f28-8db5-dc0ee0b4c063@kernel.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 07/05/2025 11:56, Qiang Yu wrote: > > On 5/7/2025 4:25 PM, Krzysztof Kozlowski wrote: >> On 07/05/2025 10:19, Ziyue Zhang wrote: >>> On 5/7/2025 1:10 PM, Krzysztof Kozlowski wrote: >>>> On Wed, May 07, 2025 at 11:10:15AM GMT, Ziyue Zhang wrote: >>>>> Add compatible for qcs8300 platform, with sa8775p as the fallback. >>>>> >>>>> Signed-off-by: Ziyue Zhang >>>>> --- >>>>> .../bindings/pci/qcom,pcie-sa8775p.yaml | 26 ++++++++++++++----- >>>>> 1 file changed, 19 insertions(+), 7 deletions(-) >>>>> >>>>> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-sa8775p.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-sa8775p.yaml >>>>> index efde49d1bef8..154bb60be402 100644 >>>>> --- a/Documentation/devicetree/bindings/pci/qcom,pcie-sa8775p.yaml >>>>> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie-sa8775p.yaml >>>>> @@ -16,7 +16,12 @@ description: >>>>> >>>>> properties: >>>>> compatible: >>>>> - const: qcom,pcie-sa8775p >>>>> + oneOf: >>>>> + - const: qcom,pcie-sa8775p >>>>> + - items: >>>>> + - enum: >>>>> + - qcom,pcie-qcs8300 >>>>> + - const: qcom,pcie-sa8775p >>>>> >>>>> reg: >>>>> minItems: 6 >>>>> @@ -45,7 +50,7 @@ properties: >>>>> >>>>> interrupts: >>>>> minItems: 8 >>>>> - maxItems: 8 >>>>> + maxItems: 9 >>>> I don't understand why this is flexible for sa8775p. I assume this >>>> wasn't tested or finished, just like your previous patch suggested. >>>> >>>> Please send complete bindings once you finish them or explain what >>>> exactly changed in the meantime. >>>> >>>> Best regards, >>>> Krzysztof >>> Hi Krzysztof >>> Global interrupt is optional in the PCIe driver. It is not present in >>> the SA8775p PCIe device tree node, but it is required for the QCS8300 >> And hardware? > > The PCIe controller on the SA8775p is also capable of generating a global > interrupt. >>> I did the DTBs and yaml checks before pushing this patch. This is how >>> I became aware that `maxItem` needed to be changed to 9. >> If it is required for QCS8300, then you are supposed to make it required >> in the binding for this device. Look at other bindings. > > The global interrupt is not mandatory. The PCIe driver can still function > without this interrupt, but it will offer a better user experience when > the device is plugged in or removed. On other platforms, the global > interrupt is also optional, and `minItems` and `maxItems` are set to 8 and > 9 respectively. Please refer to `qcom,pcie - sm8550.yaml`, > `qcom,pcie - sm8450.yaml`, and `qcom,pcie - x1e80100.yaml`. I don't know what does it prove. You cannot add requirement of global interrupt to existing devices because it would be an ABI break. Best regards, Krzysztof -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy