iommu: tegra/gart: Add device tree support

This commit adds device tree support for the GART hardware available on
NVIDIA Tegra 20 SoCs.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

2 files changed, 25 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/iommu/nvidia,tegra20-gart.txt b/Documentation/devicetree/bindings/iommu/nvidia,tegra20-gart.txt
new file mode 100644
index 000000000000..2d87b9191fce
--- /dev/null
+++ b/Documentation/devicetree/bindings/iommu/nvidia,tegra20-gart.txt
@@ -0,0 +1,14 @@
+NVIDIA Tegra 20 GART
+
+Required properties:
+- compatible: "nvidia,tegra20-gart"
+- reg: Two pairs of cells specifying the physical address and size of
+  the memory controller registers and the GART aperture respectively.
+
+Example:
+
+        gart: gart@7000f000 {
+                compatible = "nvidia,tegra20-gart";
+                reg = < 0x7000f000 0x00000100    /* controller registers */
+                        0x58000000 0x02000000 >; /* GART aperture */
+        };
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index f6bc1e67e1a3..40533bba6254 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -29,6 +29,7 @@
 #include <linux/device.h>
 #include <linux/io.h>
 #include <linux/iommu.h>
+#include <linux/of.h>
 
 #include <asm/cacheflush.h>
 
@@ -422,6 +423,14 @@ const struct dev_pm_ops tegra_gart_pm_ops = {
         .resume         = tegra_gart_resume,
 };
 
+#ifdef CONFIG_OF
+static struct of_device_id tegra_gart_of_match[] __devinitdata = {
+        { .compatible = "nvidia,tegra20-gart", },
+        { },
+};
+MODULE_DEVICE_TABLE(of, tegra_gart_of_match);
+#endif
+
 static struct platform_driver tegra_gart_driver = {
         .probe          = tegra_gart_probe,
         .remove         = tegra_gart_remove,
@@ -429,6 +438,7 @@ static struct platform_driver tegra_gart_driver = {
                 .owner  = THIS_MODULE,
                 .name   = "tegra-gart",
                 .pm     = &tegra_gart_pm_ops,
+                .of_match_table = of_match_ptr(tegra_gart_of_match),
         },
 };
 
@@ -448,4 +458,5 @@ module_exit(tegra_gart_exit);
 
 MODULE_DESCRIPTION("IOMMU API for GART in Tegra20");
 MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
+MODULE_ALIAS("platform:tegra-gart");
 MODULE_LICENSE("GPL v2");