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: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index f8b1221..a4221f6 100644 (file)
--- 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;
 };
 
@@ -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 = {