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

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Message-ID: <20231027123125.GC17527@thinkpad>
Date:   Fri, 27 Oct 2023 18:01:25 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Mrinmay Sarkar <quic_msarkar@...cinc.com>
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 Thu, Oct 26, 2023 at 12:29:30PM +0530, Mrinmay Sarkar wrote:
> 
> 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.
> 

Ok. I didn't realize that the clocks are different. In that case, you need to
mention it in the commit message to make it clear and introduce a new
compatible.

- Mani

> //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
> > > > > 

-- 
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