Release PERST# signal via GPIO when "reset-gpios" is defined in device tree.
Signed-off-by: Pali Rohár pali@kernel.org --- drivers/pci/pci_mvebu.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/drivers/pci/pci_mvebu.c b/drivers/pci/pci_mvebu.c index d80f87e0cfc6..269c027db204 100644 --- a/drivers/pci/pci_mvebu.c +++ b/drivers/pci/pci_mvebu.c @@ -22,6 +22,7 @@ #include <asm/io.h> #include <asm/arch/cpu.h> #include <asm/arch/soc.h> +#include <asm-generic/gpio.h> #include <linux/bitops.h> #include <linux/delay.h> #include <linux/errno.h> @@ -60,6 +61,7 @@ struct mvebu_pcie { struct resource mem; void __iomem *iobase; struct resource io; + struct gpio_desc reset_gpio; u32 intregs; u32 port; u32 lane; @@ -416,6 +418,14 @@ static int mvebu_pcie_probe(struct udevice *dev) struct udevice *ctlr = pci_get_controller(dev); struct pci_controller *hose = dev_get_uclass_priv(ctlr); u32 reg; + int ret; + + /* Request for optional PERST# GPIO */ + ret = gpio_request_by_name(dev, "reset-gpios", 0, &pcie->reset_gpio, GPIOD_IS_OUT); + if (ret && ret != -ENOENT) { + printf("%s: unable to request reset-gpios: %d\n", pcie->name, ret); + return ret; + }
/* * Change Class Code of PCI Bridge device to PCI Bridge (0x600400) @@ -537,6 +547,10 @@ static int mvebu_pcie_probe(struct udevice *dev) pcie->cfgcache[(PCI_PREF_MEMORY_BASE - 0x10) / 4] = PCI_PREF_RANGE_TYPE_64 | (PCI_PREF_RANGE_TYPE_64 << 16);
+ /* Release PERST# via GPIO when it was defined */ + if (dm_gpio_is_valid(&pcie->reset_gpio)) + dm_gpio_set_value(&pcie->reset_gpio, 0); + mvebu_pcie_wait_for_link(pcie);
return 0;