pci: pcie_cdns_ti: Add support to provide refclk to PCIe connector

Add support to provide refclk to PCIe connector.

Based on: https://lore.kernel.org/r/[email protected]

Signed-off-by: George McCollister <[email protected]>
Tested-by: Bryan Brattlof <[email protected]>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/pci/pcie_cdns_ti.c b/drivers/pci/pcie_cdns_ti.c
index 9d1d123a18c..ff56ba3930c 100644
--- a/drivers/pci/pcie_cdns_ti.c
+++ b/drivers/pci/pcie_cdns_ti.c
@@ -742,6 +742,20 @@ static int pcie_cdns_ti_probe(struct udevice *dev)
 	}
 	generic_phy_reset(&serdes);
 	generic_phy_init(&serdes);
+
+	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");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(clk);
+	if (ret) {
+		dev_err(dev, "failed to enable pcie_refclk\n");
+		return ret;
+	}
+
 	generic_phy_power_on(&serdes);
 
 	ret = pcie_cdns_ti_ctrl_init(pcie);