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

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Date:   Thu, 26 Oct 2023 11:40:35 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Mrinmay Sarkar <quic_msarkar@...cinc.com>
Cc:     Manivannan Sadhasivam <mani@...nel.org>, 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 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

> --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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