linux-kernel - [PATCH v3 2/2] PCI: qcom: Add support for modular builds

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Message-Id: <20221017114705.8277-3-johan+linaro@kernel.org>
Date:   Mon, 17 Oct 2022 13:47:05 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Stanimir Varbanov <svarbanov@...sol.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v3 2/2] PCI: qcom: Add support for modular builds

Allow the Qualcomm PCIe controller driver to be built as a module, which
is useful for multi-platform kernels as well as during development.

Reviewed-by: Rob Herring <robh@...nel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Acked-by: Stanimir Varbanov <svarbanov@...sol.com>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/pci/controller/dwc/Kconfig     |  2 +-
 drivers/pci/controller/dwc/pcie-qcom.c | 26 +++++++++++++++++++++++---
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
index 62ce3abf0f19..230f56d1a268 100644
--- a/drivers/pci/controller/dwc/Kconfig
+++ b/drivers/pci/controller/dwc/Kconfig
@@ -168,7 +168,7 @@ config PCI_HISI
 	  Hip05 and Hip06 SoCs
 
 config PCIE_QCOM
-	bool "Qualcomm PCIe controller"
+	tristate "Qualcomm PCIe controller"
 	depends on OF && (ARCH_QCOM || COMPILE_TEST)
 	depends on PCI_MSI_IRQ_DOMAIN
 	select PCIE_DW_HOST
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 417be4d225ed..699172c22ed4 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -17,7 +17,7 @@
 #include <linux/io.h>
 #include <linux/iopoll.h>
 #include <linux/kernel.h>
-#include <linux/init.h>
+#include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/pci.h>
@@ -1820,6 +1820,21 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static int qcom_pcie_remove(struct platform_device *pdev)
+{
+	struct qcom_pcie *pcie = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+
+	dw_pcie_host_deinit(&pcie->pci->pp);
+
+	phy_exit(pcie->phy);
+
+	pm_runtime_put_sync(dev);
+	pm_runtime_disable(dev);
+
+	return 0;
+}
+
 static const struct of_device_id qcom_pcie_match[] = {
 	{ .compatible = "qcom,pcie-apq8064", .data = &cfg_2_1_0 },
 	{ .compatible = "qcom,pcie-apq8084", .data = &cfg_1_0_0 },
@@ -1841,6 +1856,7 @@ static const struct of_device_id qcom_pcie_match[] = {
 	{ .compatible = "qcom,pcie-sm8450-pcie1", .data = &cfg_1_9_0 },
 	{ }
 };
+MODULE_DEVICE_TABLE(of, qcom_pcie_match);
 
 static void qcom_fixup_class(struct pci_dev *dev)
 {
@@ -1856,10 +1872,14 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x1001, qcom_fixup_class);
 
 static struct platform_driver qcom_pcie_driver = {
 	.probe = qcom_pcie_probe,
+	.remove = qcom_pcie_remove,
 	.driver = {
 		.name = "qcom-pcie",
-		.suppress_bind_attrs = true,
 		.of_match_table = qcom_pcie_match,
 	},
 };
-builtin_platform_driver(qcom_pcie_driver);
+module_platform_driver(qcom_pcie_driver);
+
+MODULE_AUTHOR("Stanimir Varbanov <svarbanov@...sol.com>");
+MODULE_DESCRIPTION("Qualcomm PCIe root complex driver");
+MODULE_LICENSE("GPL");
-- 
2.37.3