Port of a Linux commit bde4a5a00e761f55be92f62378cf5024ced79ee3
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.
To support such designs, allow reset GPIO request to defer probing of the
driver.
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Cc: yurovsky@xxxxxxxxx
Cc: Fabio Estevam <fabio.estevam@xxxxxxx>
Cc: Dong Aisheng <dongas86@xxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
drivers/pci/pci-imx6.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/pci-imx6.c b/drivers/pci/pci-imx6.c
index 6471f95b6..517c6bef8 100644
--- a/drivers/pci/pci-imx6.c
+++ b/drivers/pci/pci-imx6.c
@@ -562,8 +562,8 @@ static const struct dw_pcie_host_ops imx6_pcie_host_ops = {
.host_init = imx6_pcie_host_init,
};
-static int __init imx6_add_pcie_port(struct imx6_pcie *imx6_pcie,
- struct device_d *dev)
+static int imx6_add_pcie_port(struct imx6_pcie *imx6_pcie,
+ struct device_d *dev)
{
struct dw_pcie *pci = imx6_pcie->pci;
struct pcie_port *pp = &pci->pp;
@@ -581,7 +581,7 @@ static int __init imx6_add_pcie_port(struct imx6_pcie *imx6_pcie,
return 0;
}
-static int __init imx6_pcie_probe(struct device_d *dev)
+static int imx6_pcie_probe(struct device_d *dev)
{
struct resource *iores;
struct dw_pcie *pci;
@@ -606,6 +606,9 @@ static int __init imx6_pcie_probe(struct device_d *dev)
/* Fetch GPIOs */
imx6_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
+ if (imx6_pcie->reset_gpio == -EPROBE_DEFER)
+ return imx6_pcie->reset_gpio;
+
if (gpio_is_valid(imx6_pcie->reset_gpio)) {
ret = gpio_request_one(imx6_pcie->reset_gpio,
GPIOF_OUT_INIT_LOW, "PCIe reset");
--
2.20.1
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