i.MX7D variant of the IP can use either Crystal Oscillator input
or internal clock input as a Reference Clock input for PCIe PHY.
Add support for an optional property 'fsl,pcie-phy-refclk-internal'.
If present then an internal clock input is used as PCIe PHY
reference clock source. By default an external oscillator input
is still used.
Verified on Compulab SBC-iMX7 Single Board Computer.
Signed-off-by: Ilya Ledvich <ilya@xxxxxxxxxxxxxx>
---
changes since V2:
add a vendor prefix 'fsl' to a new property
Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt | 5 +++++
drivers/pci/dwc/pci-imx6.c | 8 +++++++-
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index 7b1e48b..1591a6a 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -50,6 +50,11 @@ Additional required properties for imx7d-pcie:
- "pciephy"
- "apps"
+Additional optional properties for imx7d-pcie:
+- fsl,pcie-phy-refclk-internal: If present then an internal PLL input is used
+ as PCIe PHY reference clock source. By default an external oscillator input
+ is used.
+
Example:
pcie@0x01000000 {
diff --git a/drivers/pci/dwc/pci-imx6.c b/drivers/pci/dwc/pci-imx6.c
index b734835..36812d3 100644
--- a/drivers/pci/dwc/pci-imx6.c
+++ b/drivers/pci/dwc/pci-imx6.c
@@ -61,6 +61,7 @@ struct imx6_pcie {
u32 tx_swing_low;
int link_gen;
struct regulator *vpcie;
+ bool pciephy_refclk_sel;
};
/* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */
@@ -474,7 +475,9 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
switch (imx6_pcie->variant) {
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->pciephy_refclk_sel ?
+ IMX7D_GPR12_PCIE_PHY_REFCLK_SEL : 0);
break;
case IMX6SX:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
@@ -840,6 +843,9 @@ static int imx6_pcie_probe(struct platform_device *pdev)
imx6_pcie->vpcie = NULL;
}
+ imx6_pcie->pciephy_refclk_sel =
+ of_property_read_bool(node, "fsl,pcie-phy-refclk-internal");
+
platform_set_drvdata(pdev, imx6_pcie);
ret = imx6_add_pcie_port(imx6_pcie, pdev);
--
1.9.1
