i2c-s3c2410: Add device tree support

Add device tree probe support for Samsung's s3c2410 i2c driver.

Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

diff --git a/Documentation/devicetree/bindings/i2c/samsung-i2c.txt b/Documentation/devicetree/bindings/i2c/samsung-i2c.txt
new file mode 100644 (file)
index 0000000..38832c7
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/samsung-i2c.txt
@@ -0,0 +1,39 @@
+* 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 the following: <SDA, SCL>.
+    The gpio specifier depends on the gpio controller.
+
+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 266dd83..9c00ad1 100644 (file)
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -35,6 +35,8 @@
 #include <linux/cpufreq.h>
 #include <linux/slab.h>
 #include <linux/io.h>
+#include <linux/of_i2c.h>
+#include <linux/of_gpio.h>
 
 #include <asm/irq.h>
 
@@ -79,6 +81,7 @@ struct s3c24xx_i2c {
        struct i2c_adapter      adap;
 
        struct s3c2410_platform_i2c     *pdata;
+       int                     gpios[2];
 #ifdef CONFIG_CPU_FREQ
        struct notifier_block   freq_transition;
 #endif
@@ -96,6 +99,12 @@ static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
        struct platform_device *pdev = to_platform_device(i2c->dev);
        enum s3c24xx_i2c_type type;
 
+#ifdef CONFIG_OF
+       if (i2c->dev->of_node)
+               return of_device_is_compatible(i2c->dev->of_node,
+                               "samsung,s3c2440-i2c");
+#endif
+
        type = platform_get_device_id(pdev)->driver_data;
        return type == TYPE_S3C2440;
 }
@@ -742,6 +751,49 @@ static inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c)
 }
 #endif
 
+#ifdef CONFIG_OF
+static int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c)
+{
+       int idx, gpio, ret;
+
+       for (idx = 0; idx < 2; idx++) {
+               gpio = of_get_gpio(i2c->dev->of_node, idx);
+               if (!gpio_is_valid(gpio)) {
+                       dev_err(i2c->dev, "invalid gpio[%d]: %d\n", idx, gpio);
+                       goto free_gpio;
+               }
+
+               ret = gpio_request(gpio, "i2c-bus");
+               if (ret) {
+                       dev_err(i2c->dev, "gpio [%d] request failed\n", gpio);
+                       goto free_gpio;
+               }
+       }
+       return 0;
+
+free_gpio:
+       while (--idx >= 0)
+               gpio_free(i2c->gpios[idx]);
+       return -EINVAL;
+}
+
+static void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c)
+{
+       unsigned int idx;
+       for (idx = 0; idx < 2; idx++)
+               gpio_free(i2c->gpios[idx]);
+}
+#else
+static int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c)
+{
+       return -EINVAL;
+}
+
+static void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c)
+{
+}
+#endif
+
 /* s3c24xx_i2c_init
  *
  * initialise the controller, set the IO lines and frequency
@@ -761,6 +813,9 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
 
        if (pdata->cfg_gpio)
                pdata->cfg_gpio(to_platform_device(i2c->dev));
+       else
+               if (s3c24xx_i2c_parse_dt_gpio(i2c))
+                       return -EINVAL;
 
        /* write slave address */
 
@@ -786,6 +841,34 @@ 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;
+
+       pdata->bus_num = -1; /* i2c bus number is dynamically assigned */
+       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
@@ -798,10 +881,12 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
        struct resource *res;
        int ret;
 
-       pdata = pdev->dev.platform_data;
-       if (!pdata) {
-               dev_err(&pdev->dev, "no platform data\n");
-               return -EINVAL;
+       if (!pdev->dev.of_node) {
+               pdata = pdev->dev.platform_data;
+               if (!pdata) {
+                       dev_err(&pdev->dev, "no platform data\n");
+                       return -EINVAL;
+               }
        }
 
        i2c = kzalloc(sizeof(struct s3c24xx_i2c), GFP_KERNEL);
@@ -818,6 +903,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 
        if (pdata)
                memcpy(i2c->pdata, pdata, sizeof(*pdata));
+       else
+               s3c24xx_i2c_parse_dt(pdev->dev.of_node, i2c);
 
        strlcpy(i2c->adap.name, "s3c2410-i2c", sizeof(i2c->adap.name));
        i2c->adap.owner   = THIS_MODULE;
@@ -914,6 +1001,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
         */
 
        i2c->adap.nr = i2c->pdata->bus_num;
+       i2c->adap.dev.of_node = pdev->dev.of_node;
 
        ret = i2c_add_numbered_adapter(&i2c->adap);
        if (ret < 0) {
@@ -921,6 +1009,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
                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));
@@ -969,6 +1058,7 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
        iounmap(i2c->regs);
 
        release_resource(i2c->ioarea);
+       s3c24xx_i2c_dt_gpio_free(i2c);
        kfree(i2c->ioarea);
        kfree(i2c);
 
@@ -1022,6 +1112,17 @@ 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,
@@ -1030,6 +1131,7 @@ static struct platform_driver s3c24xx_i2c_driver = {
                .owner  = THIS_MODULE,
                .name   = "s3c-i2c",
                .pm     = S3C24XX_DEV_PM_OPS,
+               .of_match_table = s3c24xx_i2c_match,
        },
 };