[PATCH 8/8] PCIe: imx6: imx7d: add support for phy refclk source
From: tyler at opensourcefoundries.com <hidden>
Date: 2017-11-30 20:15:04
Also in:
linux-devicetree, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
From: Tyler Baker <redacted> 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 <redacted> Signed-off-by: Ilya Ledvich <redacted> --- 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,
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2.9.3