PCI: imx: Fix probe failure without power domain

On chips without a separate power domain for PCI (such as 6q/6qp) the
imx6_pcie_attach_pd() function incorrectly returns an error.

Fix by returning 0 if dev_pm_domain_attach_by_name() does not find
anything.

Fixes: 3f7cceeab895 ("PCI: imx: Add multi-pd support")
Reported-by: Lukas F.Hartmann <lukas@mntmn.com>
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 52e47dac028f7c43c7dde99945b2961b22554016..ac5f6ae0b2549ab4e4e75044f4998938db5700c3 100644 (file)
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -310,6 +310,9 @@ static int imx6_pcie_attach_pd(struct device *dev)
        imx6_pcie->pd_pcie = dev_pm_domain_attach_by_name(dev, "pcie");
        if (IS_ERR(imx6_pcie->pd_pcie))
                return PTR_ERR(imx6_pcie->pd_pcie);
+       /* Do nothing when power domain missing */
+       if (!imx6_pcie->pd_pcie)
+               return 0;
        link = device_link_add(dev, imx6_pcie->pd_pcie,
                        DL_FLAG_STATELESS |
                        DL_FLAG_PM_RUNTIME |