The i.MX7D variant of the IP can use either an external
crystal oscillator input or an internal clock input as
a reference clock input for the PCIe PHY.
Add support for an optional property 'fsl,pcie-phy-refclk-internal'
If present then the internal clock input is used as
PCIe PHY reference clock source. The previous default
of using an external ocsillator input (if the property
doesn't exist), doesn't change.
Signed-off-by: André Draszik <[email protected]>
Cc: Richard Zhu <[email protected]>
Cc: Lucas Stach <[email protected]>
Cc: Lorenzo Pieralisi <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Pengutronix Kernel Team <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: NXP Linux Team <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
---
drivers/pci/controller/dwc/pci-imx6.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 9b5cb5b70389..bb3700c9157c 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -63,6 +63,7 @@ struct imx6_pcie {
struct dw_pcie *pci;
int reset_gpio;
bool gpio_active_high;
+ bool phy_refclk_internal;
struct clk *pcie_bus;
struct clk *pcie_phy;
struct clk *pcie_inbound_axi;
@@ -635,7 +636,10 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
break;
case IMX7D:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
- IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, 0);
+ IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
+ imx6_pcie->phy_refclk_internal
+ ? IMX7D_GPR12_PCIE_PHY_REFCLK_SEL
+ : 0);
break;
case IMX6SX:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
@@ -1171,6 +1175,9 @@ static int imx6_pcie_probe(struct platform_device *pdev)
if (ret)
imx6_pcie->link_gen = 1;
+ imx6_pcie->phy_refclk_internal =
+ of_property_read_bool(node, "fsl,pcie-phy-refclk-internal");
+
imx6_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, "vpcie");
if (IS_ERR(imx6_pcie->vpcie)) {
if (PTR_ERR(imx6_pcie->vpcie) == -EPROBE_DEFER)
--
2.23.0.rc1