[PATCH] i2c: at91: add support of device tree

[Raphaël Poggi <poggi.raph@xxxxxxxxx>]

Signed-off-by: Raphaël Poggi <poggi.raph@xxxxxxxxx>
---
 drivers/i2c/busses/i2c-at91.c | 41 ++++++++++++++++++++++++++++++++++-------
 1 file changed, 34 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 9490822..a2236ed 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -376,18 +376,44 @@ static struct platform_device_id at91_twi_devtypes[] = {
 	}
 };
 
+static struct of_device_id at91_twi_dt_ids[] = {
+	{
+		.compatible = "atmel,at91rm9200-i2c",
+		.data = (unsigned long) &at91rm9200_config,
+	} , {
+		.compatible = "atmel,at91sam9260-i2c",
+		.data = (unsigned long) &at91sam9260_config,
+	} , {
+		.compatible = "atmel,at91sam9261-i2c",
+		.data = (unsigned long) &at91sam9261_config,
+	} , {
+		.compatible = "atmel,at91sam9g20-i2c",
+		.data = (unsigned long) &at91sam9g20_config,
+	} , {
+		.compatible = "atmel,at91sam9g10-i2c",
+		.data = (unsigned long) &at91sam9g10_config,
+	}, {
+		.compatible = "atmel,at91sam9x5-i2c",
+		.data = (unsigned long) &at91sam9x5_config,
+	}, {
+		/* sentinel */
+	}
+};
+
 static int at91_twi_probe(struct device_d *dev)
 {
 	struct at91_twi_dev *i2c_at91;
 	struct at91_twi_pdata *i2c_data;
-	int rc;
+	int rc = 0;
 	u32 bus_clk_rate;
 
 	i2c_at91 = xzalloc(sizeof(struct at91_twi_dev));
 
 	rc = dev_get_drvdata(dev, (unsigned long *)&i2c_data);
-	if (rc)
+	if (rc < 0) {
+		dev_err(dev, "failed to retrieve driver data\n");
 		goto out_free;
+	}
 
 	i2c_at91->pdata = i2c_data;
 
@@ -398,7 +424,7 @@ static int at91_twi_probe(struct device_d *dev)
 		goto out_free;
 	}
 
-	i2c_at91->clk = clk_get(dev, "twi_clk");
+	i2c_at91->clk = clk_get(dev, NULL);
 	if (IS_ERR(i2c_at91->clk)) {
 		dev_err(dev, "no clock defined\n");
 		rc = -ENODEV;
@@ -427,17 +453,18 @@ static int at91_twi_probe(struct device_d *dev)
 	return 0;
 
 out_adap_fail:
-    clk_disable(i2c_at91->clk);
-    clk_put(i2c_at91->clk);
+	clk_disable(i2c_at91->clk);
+	clk_put(i2c_at91->clk);
 out_free:
-    kfree(i2c_at91);
-    return rc;
+	kfree(i2c_at91);
+	return rc;
 }
 
 static struct driver_d at91_twi_driver = {
 	.name		= "at91-twi",
 	.probe		= at91_twi_probe,
 	.id_table	= at91_twi_devtypes,
+	.of_compatible	= DRV_OF_COMPAT(at91_twi_dt_ids),
 };
 device_platform_driver(at91_twi_driver);
 
-- 
2.1.0


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