PCI: hisi: Pass device-specific struct to internal functions

Only interfaces used from outside the driver, e.g., those called by the
DesignWare core, need to accept pointers to the generic struct pcie_port.
Internal interfaces can accept pointers to the device-specific struct,
which makes them more straightforward.  No functional change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/host/pcie-hisi.c

@@ -126,13 +126,13 @@ static struct pcie_host_ops hisi_pcie_host_ops = {
 	.link_up = hisi_pcie_link_up,
 };
 
-static int hisi_add_pcie_port(struct pcie_port *pp,
-				     struct platform_device *pdev)
+static int hisi_add_pcie_port(struct hisi_pcie *hisi_pcie,
+			      struct platform_device *pdev)
 {
+	struct pcie_port *pp = &hisi_pcie->pp;
 	struct device *dev = pp->dev;
 	int ret;
 	u32 port_id;
-	struct hisi_pcie *hisi_pcie = to_hisi_pcie(pp);
 
 	if (of_property_read_u32(dev->of_node, "port-id", &port_id)) {
 		dev_err(dev, "failed to read port-id\n");
@@ -190,7 +190,7 @@ static int hisi_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(pp->dbi_base);
 	}
 
-	ret = hisi_add_pcie_port(pp, pdev);
+	ret = hisi_add_pcie_port(hisi_pcie, pdev);
 	if (ret)
 		return ret;