diff options
Diffstat (limited to 'drivers/pci/controller/cadence/pci-j721e.c')
| -rw-r--r-- | drivers/pci/controller/cadence/pci-j721e.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index 849f1e416ea5..35e61048e133 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -1,11 +1,12 @@ // SPDX-License-Identifier: GPL-2.0 -/** +/* * pci-j721e - PCIe controller driver for TI's J721E SoCs * * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com * 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); |