linux-kernel - Re: [PATCH v3 2/5] PCI: qcom-ep: Add support for SA8775P SOC

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Message-ID: <23f3f2a8-dcbd-6764-195b-49bcec451084@quicinc.com>
Date:   Thu, 26 Oct 2023 12:29:30 +0530
From:   Mrinmay Sarkar <quic_msarkar@...cinc.com>
To:     Manivannan Sadhasivam <mani@...nel.org>
CC:     <agross@...nel.org>, <andersson@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <konrad.dybcio@...aro.org>, <quic_shazhuss@...cinc.com>,
        <quic_nitegupt@...cinc.com>, <quic_ramkri@...cinc.com>,
        <quic_nayiluri@...cinc.com>, <dmitry.baryshkov@...aro.org>,
        <robh@...nel.org>, <quic_krichai@...cinc.com>,
        <quic_vbadigan@...cinc.com>, <quic_parass@...cinc.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Lorenzo Pieralisi" <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Vinod Koul <vkoul@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <mhi@...ts.linux.dev>,
        <linux-phy@...ts.infradead.org>
Subject: Re: [PATCH v3 2/5] PCI: qcom-ep: Add support for SA8775P SOC


On 10/26/2023 11:40 AM, Manivannan Sadhasivam wrote:
> On Thu, Oct 26, 2023 at 11:08:03AM +0530, Mrinmay Sarkar wrote:
>> On 10/25/2023 1:23 PM, Manivannan Sadhasivam wrote:
>>> On Thu, Oct 19, 2023 at 05:07:07PM +0530, Mrinmay Sarkar wrote:
>>>> Add support for SA8775P SoC to the Qualcomm PCIe Endpoint Controller
>>>> driver. There will be some change specific to SA8775P so adding new
>>>> compatible string.
>>>>
>>> What are those specific changes?
>>>
>>> - Mani
>> Need to enable cache snooping logic for SA8775P only.
>>
> Then you can add the compatible to the driver at that time and use the fallback
> till then i.e., just document the SA8775P compatible in bindings and use both
> SA8775P and SM8450 compatibles in the dts where the latter will act as a
> fallback.
>
> - Mani

I am getting below error in dtb checking if I add SM8450 as fallback 
compatible in dtsi. As both has different set of clocks.

//local/mnt/workspace/Mrinmay/new_lemans/next-20231018/linux-next/out/arch/arm64/boot/dts/qcom/sa8775p-ride.dtb: 
pcie-ep@...0000: compatible: 'oneOf' conditional failed, one must be 
fixed://
//        ['qcom,sa8775p-pcie-ep', 'qcom,sm8450-pcie-ep'] is too long//
//        'qcom,sdx65-pcie-ep' was expected//
//        'qcom,sdx55-pcie-ep' was expected//
//        from schema $id: 
http://devicetree.org/schemas/pci/qcom,pcie-ep.yaml#//
///local/mnt/workspace/Mrinmay/new_lemans/next-20231018/linux-next/out/arch/arm64/boot/dts/qcom/sa8775p-ride.dtb: 
pcie-ep@...0000: clocks: [[31, 66], [31, 68], [31, 69], [31, 78], [31, 
79]] is too short//
//        from schema $id: 
http://devicetree.org/schemas/pci/qcom,pcie-ep.yaml#//
///local/mnt/workspace/Mrinmay/new_lemans/next-20231018/linux-next/out/arch/arm64/boot/dts/qcom/sa8775p-ride.dtb: 
pcie-ep@...0000: clock-names: ['aux', 'cfg', 'bus_master', 'bus_slave', 
'slave_q2a'] is too short/

>> --Mrinmay
>>
>>>> Signed-off-by: Mrinmay Sarkar <quic_msarkar@...cinc.com>
>>>> ---
>>>>    drivers/pci/controller/dwc/pcie-qcom-ep.c | 1 +
>>>>    1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
>>>> index 32c8d9e..4c01c34 100644
>>>> --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
>>>> +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
>>>> @@ -858,6 +858,7 @@ static void qcom_pcie_ep_remove(struct platform_device *pdev)
>>>>    }
>>>>    static const struct of_device_id qcom_pcie_ep_match[] = {
>>>> +	{ .compatible = "qcom,sa8775p-pcie-ep", },
>>>>    	{ .compatible = "qcom,sdx55-pcie-ep", },
>>>>    	{ .compatible = "qcom,sm8450-pcie-ep", },
>>>>    	{ }
>>>> -- 
>>>> 2.7.4
>>>>