[PATCH 2/3] PCI: dwc: Add common iATU register support

[Kunihiko Hayashi]

This gets iATU register area from reg property that has reg-names "atu".
In Synopsys DWC version 4.80 or later, since iATU register area is
separated from core register area, this area is necessary to get from
DT independently.

Cc: Murali Karicheri <m-karicheri2 at ti.com>
Cc: Jingoo Han <jingoohan1 at gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel at synopsys.com>
Suggested-by: Rob Herring <robh at kernel.org>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko at socionext.com>
---
 drivers/pci/controller/dwc/pcie-designware.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 4d105ef..4a360bc 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -10,6 +10,7 @@
 
 #include <linux/delay.h>
 #include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/types.h>
 
 #include "../../pci.h"
@@ -526,11 +527,16 @@ void dw_pcie_setup(struct dw_pcie *pci)
 	u32 val;
 	struct device *dev = pci->dev;
 	struct device_node *np = dev->of_node;
+	struct platform_device *pdev;
 
 	if (pci->version >= 0x480A || (!pci->version &&
 				       dw_pcie_iatu_unroll_enabled(pci))) {
 		pci->iatu_unroll_enabled = true;
-		if (!pci->atu_base)
+		pdev = of_find_device_by_node(np);
+		if (!pci->atu_base && pdev)
+			pci->atu_base =
+			    devm_platform_ioremap_resource_byname(pdev, "atu");
+		if (IS_ERR_OR_NULL(pci->atu_base))
 			pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
 	}
 	dev_dbg(pci->dev, "iATU unroll: %s\n", pci->iatu_unroll_enabled ?
-- 
2.7.4