i2c: at91: add dt support to i2c-at91

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Acked-by: Nikolaus Voss <n.voss@weinmann.de>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

2 files changed, 79 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/i2c/atmel-i2c.txt b/Documentation/devicetree/bindings/i2c/atmel-i2c.txt
new file mode 100644
index 000000000000..b689a0d9441c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/atmel-i2c.txt
@@ -0,0 +1,30 @@
+I2C for Atmel platforms
+
+Required properties :
+- compatible : Must be "atmel,at91rm9200-i2c", "atmel,at91sam9261-i2c",
+     "atmel,at91sam9260-i2c", "atmel,at91sam9g20-i2c", "atmel,at91sam9g10-i2c"
+     or "atmel,at91sam9x5-i2c"
+- reg: physical base address of the controller and length of memory mapped
+     region.
+- interrupts: interrupt number to the cpu.
+- #address-cells = <1>;
+- #size-cells = <0>;
+
+Optional properties:
+- Child nodes conforming to i2c bus binding
+
+Examples :
+
+i2c0: i2c@fff84000 {
+        compatible = "atmel,at91sam9g20-i2c";
+        reg = <0xfff84000 0x100>;
+        interrupts = <12 4 6>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        24c512@50 {
+                compatible = "24c512";
+                reg = <0x50>;
+                pagesize = <128>;
+        }
+}
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 78bcad031d6a..aa59a254be2c 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -24,6 +24,9 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_i2c.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 
@@ -347,6 +350,12 @@ static struct at91_twi_pdata at91sam9g10_config = {
         .has_unre_flag = false,
 };
 
+static struct at91_twi_pdata at91sam9x5_config = {
+        .clk_max_div = 7,
+        .clk_offset = 4,
+        .has_unre_flag = false,
+};
+
 static const struct platform_device_id at91_twi_devtypes[] = {
         {
                 .name = "i2c-at91rm9200",
@@ -368,6 +377,42 @@ static const struct platform_device_id at91_twi_devtypes[] = {
         }
 };
 
+#if defined(CONFIG_OF)
+static const struct of_device_id atmel_twi_dt_ids[] = {
+        {
+                .compatible = "atmel,at91sam9260-i2c",
+                .data = &at91sam9260_config,
+        } , {
+                .compatible = "atmel,at91sam9g20-i2c",
+                .data = &at91sam9g20_config,
+        } , {
+                .compatible = "atmel,at91sam9g10-i2c",
+                .data = &at91sam9g10_config,
+        }, {
+                .compatible = "atmel,at91sam9x5-i2c",
+                .data = &at91sam9x5_config,
+        }, {
+                /* sentinel */
+        }
+};
+MODULE_DEVICE_TABLE(of, atmel_twi_dt_ids);
+#else
+#define atmel_twi_dt_ids NULL
+#endif
+
+static struct at91_twi_pdata * __devinit at91_twi_get_driver_data(
+                                        struct platform_device *pdev)
+{
+        if (pdev->dev.of_node) {
+                const struct of_device_id *match;
+                match = of_match_node(atmel_twi_dt_ids, pdev->dev.of_node);
+                if (!match)
+                        return NULL;
+                return match->data;
+        }
+        return (struct at91_twi_pdata *) platform_get_device_id(pdev)->driver_data;
+}
+
 static int __devinit at91_twi_probe(struct platform_device *pdev)
 {
         struct at91_twi_dev *dev;
@@ -423,6 +468,7 @@ static int __devinit at91_twi_probe(struct platform_device *pdev)
         dev->adapter.dev.parent = dev->dev;
         dev->adapter.nr = pdev->id;
         dev->adapter.timeout = AT91_I2C_TIMEOUT;
+        dev->adapter.dev.of_node = pdev->dev.of_node;
 
         rc = i2c_add_numbered_adapter(&dev->adapter);
         if (rc) {
@@ -432,6 +478,8 @@ static int __devinit at91_twi_probe(struct platform_device *pdev)
                 return rc;
         }
 
+        of_i2c_register_devices(&dev->adapter);
+
         dev_info(dev->dev, "AT91 i2c bus driver.\n");
         return 0;
 }
@@ -482,6 +530,7 @@ static struct platform_driver at91_twi_driver = {
         .driver         = {
                 .name   = "at91_i2c",
                 .owner  = THIS_MODULE,
+                .of_match_table = atmel_twi_dt_ids,
                 .pm     = at91_twi_pm_ops,
         },
 };