PCI: mediatek: Switch to use platform_get_resource_byname()

This is a transitional patch.  We currently use platfarm_get_resource() for
retrieving the IOMEM resources, but there might be some chips don't have
subsys/shared registers part, which depends on platform design, and these
will be introduced in further patches.

Switch this function to use the platform_get_resource_byname() so that the
binding can be agnostic of the resource order.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/host/pcie-mediatek.c b/drivers/pci/host/pcie-mediatek.c
index 01caa98..c649ab4 100644 (file)
--- a/drivers/pci/host/pcie-mediatek.c
+++ b/drivers/pci/host/pcie-mediatek.c
@@ -295,7 +295,8 @@ static int mtk_pcie_parse_port(struct mtk_pcie *pcie,
                return err;
        }
 
-       regs = platform_get_resource(pdev, IORESOURCE_MEM, slot + 1);
+       snprintf(name, sizeof(name), "port%d", slot);
+       regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
        port->base = devm_ioremap_resource(dev, regs);
        if (IS_ERR(port->base)) {
                dev_err(dev, "failed to map port%d base\n", slot);
@@ -336,12 +337,14 @@ static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
        struct resource *regs;
        int err;
 
-       /* get shared registers */
-       regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-       pcie->base = devm_ioremap_resource(dev, regs);
-       if (IS_ERR(pcie->base)) {
-               dev_err(dev, "failed to map shared register\n");
-               return PTR_ERR(pcie->base);
+       /* get shared registers, which are optional */
+       regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "subsys");
+       if (regs) {
+               pcie->base = devm_ioremap_resource(dev, regs);
+               if (IS_ERR(pcie->base)) {
+                       dev_err(dev, "failed to map shared register\n");
+                       return PTR_ERR(pcie->base);
+               }
        }
 
        pcie->free_ck = devm_clk_get(dev, "free_ck");