diff options
| author | Marek Vasut | 2013-12-12 22:49:58 +0100 |
|---|---|---|
| committer | Bjorn Helgaas | 2013-12-19 10:40:01 -0700 |
| commit | c28f8a1f2b5ed24d48ca6827d0ae499c2e48e8c9 (patch) | |
| tree | 6d2ce5903522ef888099c47e2d446bc71e70c66d | |
| parent | b391bf31584d879d7455e882a5e200388c8be9ac (diff) | |
PCI: imx6: Make reset-gpio optional
Some boards do not have a PCIe reset GPIO. To avoid probe failure on these
boards, make the reset GPIO optional as well.
[bhelgaas: whitespace fixes]
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Frank Li <lznuaa@gmail.com>
Cc: Harro Haan <hrhaan@gmail.com>
Cc: Mohit KUMAR <Mohit.KUMAR@st.com>
Cc: Pratyush Anand <pratyush.anand@st.com>
Cc: Richard Zhu <r65037@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Sean Cross <xobs@kosagi.com>
Cc: Siva Reddy Kallam <siva.kallam@samsung.com>
Cc: Srikanth T Shivanand <ts.srikanth@samsung.com>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Troy Kisky <troy.kisky@boundarydevices.com>
Cc: Yinghai Lu <yinghai@kernel.org>
| -rw-r--r-- | Documentation/devicetree/bindings/pci/designware-pcie.txt | 2 | ||||
| -rw-r--r-- | drivers/pci/host/pci-imx6.c | 27 |
2 files changed, 15 insertions, 14 deletions
diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt index d5d26d443693..d6fae13ff062 100644 --- a/Documentation/devicetree/bindings/pci/designware-pcie.txt +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt @@ -19,6 +19,8 @@ Required properties: to define the mapping of the PCIe interface to interrupt numbers. - num-lanes: number of lanes to use + +Optional properties: - reset-gpio: gpio pin number of power good signal Optional properties for fsl,imx6q-pcie diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c index 9fc1cb66c64e..1176bddee1cc 100644 --- a/drivers/pci/host/pci-imx6.c +++ b/drivers/pci/host/pci-imx6.c @@ -214,9 +214,12 @@ 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; } @@ -432,17 +435,13 @@ 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"); - return ret; + 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"); + return ret; + } } imx6_pcie->power_on_gpio = of_get_named_gpio(np, "power-on-gpio", 0); |