Commit 49e0efdc authored by Kishon Vijay Abraham I's avatar Kishon Vijay Abraham I Committed by Lorenzo Pieralisi
Browse files

PCI: j721e: Add support to provide refclk to PCIe connector 

Add support to provide refclk to PCIe connector.

Link: https://lore.kernel.org/r/20210308063550.6227-5-kishon@ti.com


Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
parent 6b7d5394

drivers/pci/controller/cadence/pci-j721e.c

+21 −1
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
 * Author: Kishon Vijay Abraham I <kishon@ti.com>

 */



#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/gpio/consumer.h>

#include <linux/io.h>
@@ -50,6 +51,7 @@ enum link_status { 


struct j721e_pcie {

	struct device		*dev;

	struct clk		*refclk;

	u32			mode;

	u32			num_lanes;

	struct cdns_pcie	*cdns_pcie;
@@ -312,6 +314,7 @@ static int j721e_pcie_probe(struct platform_device *pdev) 
	struct cdns_pcie_ep *ep;

	struct gpio_desc *gpiod;

	void __iomem *base;

	struct clk *clk;

	u32 num_lanes;

	u32 mode;

	int ret;
@@ -411,6 +414,20 @@ static int j721e_pcie_probe(struct platform_device *pdev) 
			goto err_get_sync;

		}



		clk = devm_clk_get_optional(dev, "pcie_refclk");

		if (IS_ERR(clk)) {

			ret = PTR_ERR(clk);

			dev_err(dev, "failed to get pcie_refclk\n");

			goto err_pcie_setup;

		}



		ret = clk_prepare_enable(clk);

		if (ret) {

			dev_err(dev, "failed to enable pcie_refclk\n");

			goto err_get_sync;

		}

		pcie->refclk = clk;



		/*

		 * "Power Sequencing and Reset Signal Timings" table in

		 * PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 3.0
@@ -425,8 +442,10 @@ static int j721e_pcie_probe(struct platform_device *pdev) 
		}



		ret = cdns_pcie_host_setup(rc);

		if (ret < 0)

		if (ret < 0) {

			clk_disable_unprepare(pcie->refclk);

			goto err_pcie_setup;

		}



		break;

	case PCI_MODE_EP:
@@ -479,6 +498,7 @@ static int j721e_pcie_remove(struct platform_device *pdev) 
	struct cdns_pcie *cdns_pcie = pcie->cdns_pcie;

	struct device *dev = &pdev->dev;



	clk_disable_unprepare(pcie->refclk);

	cdns_pcie_disable_phy(cdns_pcie);

	pm_runtime_put(dev);

	pm_runtime_disable(dev);