| Message ID | 20170201165559.22436-3-andrew.smirnov@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
Am Mittwoch, den 01.02.2017, 08:55 -0800 schrieb Andrey Smirnov: > 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: yurovsky@gmail.com > Cc: Lucas Stach <l.stach@pengutronix.de> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Reviewed-by: Lucas Stach <l.stach@pengutronix.de> > --- > 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);
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);
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: yurovsky@gmail.com Cc: Lucas Stach <l.stach@pengutronix.de> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> --- drivers/pci/host/pci-imx6.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)