[PATCH 8/8] PCIe: imx6: imx7d: add support for phy refclk source

tyler
2017-11-30T20:15:04Z

From: Tyler Baker <tyler@opensourcefoundries.com>

In the i.MX7D the PCIe PHY can use either externel oscillator or
internal PLL as a reference clock source.
Add support for the PHY Reference Clock source including
device tree property phy-ref-clk.
External oscillator is used as a default reference clock source.

Signed-off-by: Tyler Baker <tyler@opensourcefoundries.com>
Signed-off-by: Ilya Ledvich <ilya@compulab.co.il>
---
drivers/pci/dwc/pci-imx6.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/dwc/pci-imx6.c b/drivers/pci/dwc/pci-imx6.c
index b734835..e935db4 100644
--- a/drivers/pci/dwc/pci-imx6.c
+++ b/drivers/pci/dwc/pci-imx6.c
@@ -45,6 +45,7 @@ enum imx6_pcie_variants {
struct imx6_pcie {
struct dw_pcie *pci;
int reset_gpio;
+ u32 phy_refclk;
bool gpio_active_high;
struct clk *pcie_bus;
struct clk *pcie_phy;
@@ -474,7 +475,7 @@ 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);
+ BIT(5), imx6_pcie->phy_refclk ? BIT(5) : 0);
break;
case IMX6SX:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
@@ -733,6 +734,11 @@ static int imx6_pcie_probe(struct platform_device *pdev)
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);

+ /* Fetch PHY Reference Clock */
+ if (of_property_read_u32(node, "phy-ref-clk", &imx6_pcie->phy_refclk))
+ imx6_pcie->phy_refclk = 0;
+ pr_info("%s: phy_refclk = %d\n", __func__, imx6_pcie->phy_refclk);
+
/* Fetch GPIOs */
imx6_pcie->reset_gpio = of_get_named_gpio(node, "reset-gpio", 0);
imx6_pcie->gpio_active_high = of_property_read_bool(node,
--
2.9.3