Add device tree probe support for Samsung's s3c2410 i2c driver.
Signed-off-by: Thomas Abraham <[email protected]>
---
.../devicetree/bindings/i2c/samsung-i2c.txt | 44 +++++++++++++++++
drivers/i2c/busses/i2c-s3c2410.c | 51 +++++++++++++++++++-
2 files changed, 94 insertions(+), 1 deletions(-)
create mode 100644 Documentation/devicetree/bindings/i2c/samsung-i2c.txt
diff --git a/Documentation/devicetree/bindings/i2c/samsung-i2c.txt
b/Documentation/devicetree/bindings/i2c/samsung-i2c.txt
new file mode 100644
index 0000000..4e1a2ef
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/samsung-i2c.txt
@@ -0,0 +1,44 @@
+* Samsung's I2C controller
+
+The Samsung's I2C controller is used to interface with I2C devices.
+
+Required properties:
+ - compatible: value should be either of the following.
+ (a) "samsung, s3c2410-i2c", for i2c compatible with s3c2410 i2c.
+ (b) "samsung, s3c2440-i2c", for i2c compatible with s3c2440 i2c.
+
+ - reg: physical base address of the controller and length of memory mapped
+ region.
+
+ - interrupts: interrupt number to the cpu.
+
+ - samsung,i2c-sda-delay: Delay (in ns) applied to data line (SDA) edges.
+
+ - gpios: The order of the gpios should be in the following order.
+ <SDA, SCL>
+
+Optional properties:
+ - samsung,i2c-slave-addr: Slave address in multi-master enviroment. If not
+ specified, default value is 0.
+
+ - samsung,i2c-max-bus-freq: Desired frequency in Hz of the bus. If not
+ specified, the default value in Hz is 100000.
+
+Example:
+
+ i2c@13870000 {
+ compatible = "samsung,s3c2440-i2c";
+ reg = <0x13870000 0x100>;
+ interrupts = <345>;
+ samsung,i2c-sda-delay = <100>;
+ samsung,i2c-max-bus-freq = <100000>;
+ gpios = <&gpd1 2 0 /* SDA */
+ &gpd1 3 0 /* SCL */>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ wm8994@1a {
+ compatible = "wlf,wm8994";
+ reg = <0x1a>;
+ };
+ };
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index e132168..40264b0 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -35,6 +35,7 @@
#include <linux/cpufreq.h>
#include <linux/slab.h>
#include <linux/io.h>
+#include <linux/of_i2c.h>
#include <asm/irq.h>
@@ -96,6 +97,10 @@ static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
struct platform_device *pdev = to_platform_device(i2c->dev);
enum s3c24xx_i2c_type type;
+ if (i2c->dev->of_node)
+ return of_device_is_compatible(i2c->dev->of_node,
+ "samsung,s3c2440-i2c");
+
type = platform_get_device_id(pdev)->driver_data;
return type == TYPE_S3C2440;
}
@@ -787,6 +792,34 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
return 0;
}
+#ifdef CONFIG_OF
+
+/* s3c24xx_i2c_parse_dt
+ *
+ * Parse the device tree node and retreive the platform data.
+*/
+
+static void
+s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c)
+{
+ struct s3c2410_platform_i2c *pdata = &i2c->pdata;
+
+ if (!np)
+ return;
+
+ of_property_read_u32(np, "samsung,i2c-sda-delay", &pdata->sda_delay);
+ of_property_read_u32(np, "samsung,i2c-slave-addr", &pdata->slave_addr);
+ of_property_read_u32(np, "samsung,i2c-max-bus-freq",
+ (u32 *)&pdata->frequency);
+}
+#else
+static void
+s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c)
+{
+ return;
+}
+#endif
+
/* s3c24xx_i2c_probe
*
* called by the bus driver when a suitable device is found
@@ -812,6 +845,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
}
memcpy(&i2c->pdata, pdata, sizeof(*pdata));
+ s3c24xx_i2c_parse_dt(pdev->dev.of_node, i2c);
strlcpy(i2c->adap.name, "s3c2410-i2c", sizeof(i2c->adap.name));
i2c->adap.owner = THIS_MODULE;
@@ -908,13 +942,16 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
*/
i2c->adap.nr = pdata->bus_num;
+ i2c->adap.dev.of_node = pdev->dev.of_node;
- ret = i2c_add_numbered_adapter(&i2c->adap);
+ ret = (pdev->dev.of_node) ? i2c_add_adapter(&i2c->adap) :
+ i2c_add_numbered_adapter(&i2c->adap);
if (ret < 0) {
dev_err(&pdev->dev, "failed to add bus to i2c core\n");
goto err_cpufreq;
}
+ of_i2c_register_devices(&i2c->adap);
platform_set_drvdata(pdev, i2c);
dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev));
@@ -1016,6 +1053,17 @@ static struct platform_device_id s3c24xx_driver_ids[] = {
};
MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
+#ifdef CONFIG_OF
+static const struct of_device_id s3c24xx_i2c_match[] = {
+ { .compatible = "samsung,s3c2410-i2c" },
+ { .compatible = "samsung,s3c2440-i2c" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
+#else
+#define s3c24xx_i2c_match NULL
+#endif
+
static struct platform_driver s3c24xx_i2c_driver = {
.probe = s3c24xx_i2c_probe,
.remove = s3c24xx_i2c_remove,
@@ -1024,6 +1072,7 @@ static struct platform_driver s3c24xx_i2c_driver = {
.owner = THIS_MODULE,
.name = "s3c-i2c",
.pm = S3C24XX_DEV_PM_OPS,
+ .of_match_table = s3c24xx_i2c_match,
},
};
--
1.6.6.rc2
_______________________________________________
devicetree-discuss mailing list
[email protected]
https://lists.ozlabs.org/listinfo/devicetree-discuss
