PCI: keystone: Use platform_get_resource_byname() to get memory resources

Use platform_get_resource_byname() instead of platform_get_resource()
which uses an index to get memory resources. While at that get the memory
resource defined specifically for configuration space instead of
deriving the configuration space address from dbics address space.

Since the pci-keystone driver has never worked in the mainline kernel,
DT backward compatibility is not an issue.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

1 files changed, 7 insertions, 10 deletions

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 566718ea7ebf..5eebef9b9ada 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -44,7 +44,6 @@
 #define CFG_TYPE1                       BIT(24)
 
 #define OB_SIZE                         0x030
-#define SPACE0_REMOTE_CFG_OFFSET        0x1000
 #define OB_OFFSET_INDEX(n)              (0x200 + (8 * (n)))
 #define OB_OFFSET_HI(n)                 (0x204 + (8 * (n)))
 #define OB_ENABLEN                      BIT(0)
@@ -807,21 +806,19 @@ static int __init ks_pcie_add_pcie_port(struct keystone_pcie *ks_pcie,
         struct resource *res;
         int ret;
 
-        /* Index 0 is the config reg. space address */
-        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbics");
         pci->dbi_base = devm_pci_remap_cfg_resource(dev, res);
         if (IS_ERR(pci->dbi_base))
                 return PTR_ERR(pci->dbi_base);
 
-        /*
-         * We set these same and is used in pcie rd/wr_other_conf
-         * functions
-         */
-        pp->va_cfg0_base = pci->dbi_base + SPACE0_REMOTE_CFG_OFFSET;
+        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
+        pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res);
+        if (IS_ERR(pp->va_cfg0_base))
+                return PTR_ERR(pp->va_cfg0_base);
+
         pp->va_cfg1_base = pp->va_cfg0_base;
 
-        /* Index 1 is the application reg. space address */
-        res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "app");
         ks_pcie->va_app_base = devm_ioremap_resource(dev, res);
         if (IS_ERR(ks_pcie->va_app_base))
                 return PTR_ERR(ks_pcie->va_app_base);