[PATCH 5/5] PCI: dwc: pci-dra7xx: get an optional clock

Luca Ceresoli
2021-05-17T15:44:59Z

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

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
---
drivers/pci/controller/dwc/pci-dra7xx.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index 05d06806c300..8dd20b394d0c 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -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;
};

@@ -744,6 +746,15 @@ 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);
@@ -931,6 +942,8 @@ 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 = {