Some designs implement reset GPIO via a GPIO expander connected to a
peripheral bus. One such example would be i.MX7 Sabre board where said
GPIO is provided by SPI shift register connected to a bitbanged SPI
bus. In order to support such designs allow reset GPIO request to defer
probing of the driver.
Cc: yurov...@gmail.com
Cc: Lucas Stach <l.st...@pengutronix.de>
Cc: Bjorn Helgaas <bhelg...@google.com>
Cc: Fabio Estevam <fabio.este...@nxp.com>
Cc: linux-arm-ker...@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com>
---
drivers/pci/host/pci-imx6.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 50a1291..3ef8093 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -611,7 +611,7 @@ static int __init imx6_add_pcie_port(struct imx6_pcie
*imx6_pcie,
return 0;
}
-static int __init imx6_pcie_probe(struct platform_device *pdev)
+static int imx6_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct imx6_pcie *imx6_pcie;
@@ -653,6 +653,8 @@ static int __init imx6_pcie_probe(struct platform_device
*pdev)
dev_err(dev, "unable to get reset gpio\n");
return ret;
}
+ } else if (imx6_pcie->reset_gpio == -EPROBE_DEFER) {
+ return imx6_pcie->reset_gpio;
}
/* Fetch clocks */
@@ -746,11 +748,12 @@ static struct platform_driver imx6_pcie_driver = {
.name = "imx6q-pcie",
.of_match_table = imx6_pcie_of_match,
},
+ .probe = imx6_pcie_probe,
.shutdown = imx6_pcie_shutdown,
};
static int __init imx6_pcie_init(void)
{
- return platform_driver_probe(&imx6_pcie_driver, imx6_pcie_probe);
+ return platform_driver_register(&imx6_pcie_driver);
}
device_initcall(imx6_pcie_init);
--
2.9.3
