On Hikey 970, there's a power supply controlled by Hi6421v600 regulator that turns on the PCI devices on the board. Without that, no PCI hardware would work.
As this is device-dependent, such regulator line should be optional. Signed-off-by: Mauro Carvalho Chehab <[email protected]> --- drivers/pci/controller/dwc/pcie-kirin.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c index 2bce6e3750d4..42aea34dff4d 100644 --- a/drivers/pci/controller/dwc/pcie-kirin.c +++ b/drivers/pci/controller/dwc/pcie-kirin.c @@ -22,6 +22,7 @@ #include <linux/pci_regs.h> #include <linux/platform_device.h> #include <linux/regmap.h> +#include <linux/regulator/consumer.h> #include <linux/resource.h> #include <linux/types.h> #include "pcie-designware.h" @@ -295,6 +296,22 @@ static void kirin970_pcie_set_eyeparam(struct kirin_pcie *kirin_pcie) static long kirin_common_pcie_get_resource(struct kirin_pcie *kirin_pcie, struct platform_device *pdev) { + struct device *dev = &pdev->dev; + struct regulator *reg; + int ret; + + reg = devm_regulator_get_optional(dev, "pci"); + if (IS_ERR_OR_NULL(reg)) { + if (PTR_ERR(reg) == -EPROBE_DEFER) + return PTR_ERR(reg); + } else { + ret = regulator_enable(reg); + if (ret) { + dev_err(dev, "Failed to enable regulator\n"); + return ret; + } + } + kirin_pcie->apb_base = devm_platform_ioremap_resource_byname(pdev, "apb"); if (IS_ERR(kirin_pcie->apb_base)) -- 2.29.2
