From: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
Signed-off-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
---
.../devicetree/bindings/i2c/atmel-i2c.txt | 30 +++++++++++++
drivers/i2c/busses/i2c-at91.c | 49 ++++++++++++++++++++++
2 files changed, 79 insertions(+)
create mode 100644 Documentation/devicetree/bindings/i2c/atmel-i2c.txt
diff --git a/Documentation/devicetree/bindings/i2c/atmel-i2c.txt b/Documentation/devicetree/bindings/i2c/atmel-i2c.txt
new file mode 100644
index 0000000..b689a0d
--- /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 bcf9a5c..7a80982 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 = "at91rm9200_i2c",
@@ -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,
},
};
--
1.7.11.3
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