| Message ID | 1459514508-8557-3-git-send-email-ynezz@true.cz (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Fri, Apr 1, 2016 at 9:41 AM, Petr Štetiar <ynezz@true.cz> wrote: > /* Some boards don't have PCIe reset GPIO. */ > if (gpio_is_valid(imx6_pcie->reset_gpio)) { > - gpio_set_value_cansleep(imx6_pcie->reset_gpio, 0); > + gpio_set_value_cansleep(imx6_pcie->reset_gpio, > + !!imx6_pcie->gpio_active_high); gpio_set_value_cansleep(imx6_pcie->reset_gpio, imx6_pcie->gpio_active_high); is enough. > @@ -546,9 +549,14 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) > > /* Fetch GPIOs */ > imx6_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0); > + imx6_pcie->gpio_active_high = of_property_read_bool(np, > + "reset-gpio-active-high"); You need to document reset-gpio-active-high property in Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c index 2f817fa..1b3bcfe 100644 --- a/drivers/pci/host/pci-imx6.c +++ b/drivers/pci/host/pci-imx6.c @@ -33,6 +33,7 @@ struct imx6_pcie { int reset_gpio; + bool gpio_active_high; struct clk *pcie_bus; struct clk *pcie_phy; struct clk *pcie; @@ -310,9 +311,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) /* Some boards don't have PCIe reset GPIO. */ if (gpio_is_valid(imx6_pcie->reset_gpio)) { - gpio_set_value_cansleep(imx6_pcie->reset_gpio, 0); + gpio_set_value_cansleep(imx6_pcie->reset_gpio, + !!imx6_pcie->gpio_active_high); msleep(100); - gpio_set_value_cansleep(imx6_pcie->reset_gpio, 1); + gpio_set_value_cansleep(imx6_pcie->reset_gpio, + !imx6_pcie->gpio_active_high); } return 0; @@ -546,9 +549,14 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) /* Fetch GPIOs */ imx6_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0); + imx6_pcie->gpio_active_high = of_property_read_bool(np, + "reset-gpio-active-high"); 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"); + imx6_pcie->gpio_active_high ? + GPIOF_OUT_INIT_HIGH : + GPIOF_OUT_INIT_LOW, + "PCIe reset"); if (ret) { dev_err(&pdev->dev, "unable to get reset gpio\n"); return ret;
We need that property in order to make the Toradex Apalis SoMs working without breaking old DTBs. On Apalis SoMs the GPIO1_IO28 used to PCIe reset is not connected directly to PERST# PCIe signal, but it's ORed with RESETBMCU coming off the PMIC, and thus is inverted, active-high. Signed-off-by: Petr Štetiar <ynezz@true.cz> --- drivers/pci/host/pci-imx6.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)