Commit 5af94053 authored by Luca Ceresoli's avatar Luca Ceresoli Committed by Lorenzo Pieralisi
Browse files

PCI: dra7xx: Get an optional clock 

If the clock is provided externally we need to make sure it is enabled
before starting PCI scan.

Link: https://lore.kernel.org/r/20210531085934.2662457-5-luca@lucaceresoli.net


Signed-off-by: default avatarLuca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
parent b9a6943d

drivers/pci/controller/dwc/pci-dra7xx.c

+13 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
 * Authors: Kishon Vijay Abraham I <kishon@ti.com>

 */



#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/err.h>
@@ -90,6 +91,7 @@ struct dra7xx_pcie { 
	int			phy_count;	/* DT phy-names count */

	struct phy		**phy;

	struct irq_domain	*irq_domain;

	struct clk              *clk;

	enum dw_pcie_device_mode mode;

};
@@ -741,6 +743,15 @@ static int dra7xx_pcie_probe(struct platform_device *pdev) 
	if (!link)

		return -ENOMEM;



	dra7xx->clk = devm_clk_get_optional(dev, NULL);

	if (IS_ERR(dra7xx->clk))

		return dev_err_probe(dev, PTR_ERR(dra7xx->clk),

				     "clock request failed");



	ret = clk_prepare_enable(dra7xx->clk);

	if (ret)

		return ret;



	for (i = 0; i < phy_count; i++) {

		snprintf(name, sizeof(name), "pcie-phy%d", i);

		phy[i] = devm_phy_get(dev, name);
@@ -926,6 +937,8 @@ static void dra7xx_pcie_shutdown(struct platform_device *pdev) 


	pm_runtime_disable(dev);

	dra7xx_pcie_disable_phy(dra7xx);



	clk_disable_unprepare(dra7xx->clk);

}



static const struct dev_pm_ops dra7xx_pcie_pm_ops = {