[PATCH] i2c: Tegra: Add DeviceTree support

[John Bonesio <bones-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>]

This patch modifies the tegra i2c driver so that it can be initiailized
using the device tree along with the devices connected to the i2c bus.

Signed-off-by: John Bonesio <bones-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
Acked-by: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
Acked-by: OIof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org>
---

 drivers/i2c/busses/i2c-tegra.c |   18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 4d93196..48bb250 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -26,6 +26,7 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/i2c-tegra.h>
+#include <linux/of_i2c.h>
 
 #include <asm/unaligned.h>
 
@@ -540,6 +541,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	struct resource *iomem;
 	struct clk *clk;
 	struct clk *i2c_clk;
+	const unsigned int *prop;
 	void *base;
 	int irq;
 	int ret = 0;
@@ -597,7 +599,17 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	i2c_dev->irq = irq;
 	i2c_dev->cont_id = pdev->id;
 	i2c_dev->dev = &pdev->dev;
-	i2c_dev->bus_clk_rate = pdata ? pdata->bus_clk_rate : 100000;
+
+	i2c_dev->bus_clk_rate = 100000; /* default clock rate */
+	if (pdata) {
+		i2c_dev->bus_clk_rate = pdata->bus_clk_rate;
+
+	} else if (i2c_dev->dev->of_node) {    /* if there is a device tree node ... */
+		prop = of_get_property(i2c_dev->dev->of_node,
+				"clock-frequency", NULL);
+		if (prop)
+			i2c_dev->bus_clk_rate = be32_to_cpup(prop);
+	}
 
 	if (pdev->id == 3)
 		i2c_dev->is_dvc = 1;
@@ -627,6 +639,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	i2c_dev->adapter.algo = &tegra_i2c_algo;
 	i2c_dev->adapter.dev.parent = &pdev->dev;
 	i2c_dev->adapter.nr = pdev->id;
+	i2c_dev->adapter.dev.of_node = pdev->dev.of_node;
 
 	ret = i2c_add_numbered_adapter(&i2c_dev->adapter);
 	if (ret) {
@@ -634,6 +647,8 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 		goto err_free_irq;
 	}
 
+	of_i2c_register_devices(&i2c_dev->adapter);
+
 	return 0;
 err_free_irq:
 	free_irq(i2c_dev->irq, i2c_dev);
@@ -708,6 +723,7 @@ static struct platform_driver tegra_i2c_driver = {
 	.driver  = {
 		.name  = "tegra-i2c",
 		.owner = THIS_MODULE,
+		.of_match_table = tegra_i2c_of_match,
 	},
 };