linux-kernel - [PATCH v2 2/2] PCI: qcom-ep: Add HDMA support for QCS9100 SoC

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Message-ID: <20240709-add_qcs9100_pcie_ep_compatible-v2-2-217742eac32b@quicinc.com>
Date: Tue, 9 Jul 2024 22:53:44 +0800
From: Tengfei Fan <quic_tengfan@...cinc.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        "Lorenzo
 Pieralisi" <lpieralisi@...nel.org>,
        Krzysztof Wilczyński
	<kw@...ux.com>,
        Rob Herring <robh@...nel.org>, Bjorn Helgaas
	<bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>
CC: <kernel@...cinc.com>, <linux-pci@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Tengfei Fan <quic_tengfan@...cinc.com>
Subject: [PATCH v2 2/2] PCI: qcom-ep: Add HDMA support for QCS9100 SoC

QCS9100 SoC supports the new Hyper DMA (HDMA) DMA Engine inside the DWC IP,
so add support for it by passing the mapping format and the number of
read/write channels count.

The PCIe EP controller used on this SoC is of version 1.34.0, so a separate
config struct is introduced for the sake of enabling HDMA conditionally.

It should be noted that for the eDMA support (predecessor of HDMA), there
are no mapping format and channels count specified. That is because eDMA
supports auto detection of both parameters, whereas HDMA doesn't.

QCS9100 is drived from SA8775p. Currently, both the QCS9100 and SA8775p
platform use non-SCMI resource. In the future, the SA8775p platform will
move to use SCMI resources and it will have new sa8775p-related device
tree. Consequently, introduce "qcom,qcs9100-pcie-ep" to the PCIe device
match table.

Signed-off-by: Tengfei Fan <quic_tengfan@...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 236229f66c80..e2775f4ca7ee 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -904,6 +904,7 @@ static const struct qcom_pcie_ep_cfg cfg_1_34_0 = {
 };

 static const struct of_device_id qcom_pcie_ep_match[] = {
+	{ .compatible = "qcom,qcs9100-pcie-ep", .data = &cfg_1_34_0},
 	{ .compatible = "qcom,sa8775p-pcie-ep", .data = &cfg_1_34_0},
 	{ .compatible = "qcom,sdx55-pcie-ep", },
 	{ .compatible = "qcom,sm8450-pcie-ep", },

-- 
2.25.1