PCI: armada8k: Add support for gpio controlled reset signal (3d71746c) · Commits · 戴 / test

drivers/pci/controller/dwc/pcie-armada8k.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@
		#include <linux/resource.h>
		#include <linux/of_pci.h>
		#include <linux/of_irq.h>
		#include <linux/gpio/consumer.h>

		#include "pcie-designware.h"

		@@ -29,6 +30,7 @@ struct armada8k_pcie {
		struct dw_pcie *pci;
		struct clk *clk;
		struct clk *clk_reg;
		struct gpio_desc *reset_gpio;
		};

		#define PCIE_VENDOR_REGS_OFFSET 0x8000
		@@ -137,6 +139,12 @@ static int armada8k_pcie_host_init(struct pcie_port *pp)
		struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
		struct armada8k_pcie *pcie = to_armada8k_pcie(pci);

		if (pcie->reset_gpio) {
		/* assert and then deassert the reset signal */
		gpiod_set_value_cansleep(pcie->reset_gpio, 1);
		msleep(100);
		gpiod_set_value_cansleep(pcie->reset_gpio, 0);
		}
		dw_pcie_setup_rc(pp);
		armada8k_pcie_establish_link(pcie);

		@@ -249,6 +257,14 @@ static int armada8k_pcie_probe(struct platform_device *pdev)
		goto fail_clkreg;
		}

		/* Get reset gpio signal and hold asserted (logically high) */
		pcie->reset_gpio = devm_gpiod_get_optional(dev, "reset",
		GPIOD_OUT_HIGH);
		if (IS_ERR(pcie->reset_gpio)) {
		ret = PTR_ERR(pcie->reset_gpio);
		goto fail_clkreg;
		}

		platform_set_drvdata(pdev, pcie);

		ret = armada8k_add_pcie_port(pcie, pdev);