Some boards do not have a PCIe reset GPIO. To avoid probe failure on these boards, make the reset GPIO optional as well. Signed-off-by: Marek Vasut <marex@xxxxxxx> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Cc: Frank Li <lznuaa@xxxxxxxxx> Cc: Jingoo Han <jg1.han@xxxxxxxxxxx> Cc: Mohit KUMAR <Mohit.KUMAR@xxxxxx> Cc: Pratyush Anand <pratyush.anand@xxxxxx> Cc: Richard Zhu <r65037@xxxxxxxxxxxxx> Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> Cc: Sean Cross <xobs@xxxxxxxxxx> Cc: Shawn Guo <shawn.guo@xxxxxxxxxx> Cc: Siva Reddy Kallam <siva.kallam@xxxxxxxxxxx> Cc: Srikanth T Shivanand <ts.srikanth@xxxxxxxxxxx> Cc: Tim Harvey <tharvey@xxxxxxxxxxxxx> Cc: Troy Kisky <troy.kisky@xxxxxxxxxxxxxxxxxxx> Cc: Yinghai Lu <yinghai@xxxxxxxxxx> --- .../devicetree/bindings/pci/designware-pcie.txt | 2 +- drivers/pci/host/pci-imx6.c | 29 +++++++++++----------- 2 files changed, 16 insertions(+), 15 deletions(-) diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt index d5d26d4..b7a2279 100644 --- a/Documentation/devicetree/bindings/pci/designware-pcie.txt +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt @@ -19,9 +19,9 @@ Required properties: to define the mapping of the PCIe interface to interrupt numbers. - num-lanes: number of lanes to use -- reset-gpio: gpio pin number of power good signal Optional properties for fsl,imx6q-pcie +- reset-gpio: gpio pin number of power good signal - power-on-gpio: gpio pin number of power-enable signal - wake-up-gpio: gpio pin number of incoming wakeup signal - disable-gpio: gpio pin number of outgoing rfkill/endpoint disable signal diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c index 5afa922..728989a 100644 --- a/drivers/pci/host/pci-imx6.c +++ b/drivers/pci/host/pci-imx6.c @@ -220,9 +220,12 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp) regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16); - gpio_set_value(imx6_pcie->reset_gpio, 0); - msleep(100); - gpio_set_value(imx6_pcie->reset_gpio, 1); + /* Some boards don't have PCIe reset GPIO. */ + if (gpio_is_valid(imx6_pcie->reset_gpio)) { + gpio_set_value(imx6_pcie->reset_gpio, 0); + msleep(100); + gpio_set_value(imx6_pcie->reset_gpio, 1); + } return 0; } @@ -446,17 +449,15 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) /* Fetch GPIOs */ imx6_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0); - if (!gpio_is_valid(imx6_pcie->reset_gpio)) { - dev_err(&pdev->dev, "no reset-gpio defined\n"); - ret = -ENODEV; - } - ret = devm_gpio_request_one(&pdev->dev, - imx6_pcie->reset_gpio, - GPIOF_OUT_INIT_LOW, - "PCIe reset"); - if (ret) { - dev_err(&pdev->dev, "unable to get reset gpio\n"); - goto err; + if (gpio_is_valid(imx6_pcie->reset_gpio)) { + ret = devm_gpio_request_one(&pdev->dev, + imx6_pcie->reset_gpio, + GPIOF_OUT_INIT_LOW, + "PCIe reset"); + if (ret) { + dev_err(&pdev->dev, "unable to get reset gpio\n"); + goto err; + } } imx6_pcie->power_on_gpio = of_get_named_gpio(np, "power-on-gpio", 0); -- 1.8.4.rc3 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html