i2c: nomadik: Add Device Tree support to the Nomadik I2C driver

Here we apply the bindings required for successful Device Tree
probing of the i2c-nomadik driver.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

3 files changed, 56 insertions, 4 deletions

diff --git a/Documentation/devicetree/bindings/i2c/nomadik.txt b/Documentation/devicetree/bindings/i2c/nomadik.txt
new file mode 100644
index 000000000000..72065b0ff680
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/nomadik.txt
@@ -0,0 +1,23 @@
+I2C for Nomadik based systems
+
+Required (non-standard) properties:
+ - Nil
+
+Recommended (non-standard) properties:
+ - clock-frequency : Maximum bus clock frequency for the device
+
+Optional (non-standard) properties:
+ - Nil
+
+Example :
+
+i2c@80004000 {
+        compatible = "stericsson,db8500-i2c", "st,nomadik-i2c";
+        reg = <0x80004000 0x1000>;
+        interrupts = <0 21 0x4>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        v-i2c-supply = <&db8500_vape_reg>;
+
+        clock-frequency = <400000>;
+};
diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index 1b898b647ec2..698d7acb0f08 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -24,6 +24,8 @@
 #include <linux/io.h>
 #include <linux/pm_runtime.h>
 #include <linux/platform_data/i2c-nomadik.h>
+#include <linux/of.h>
+#include <linux/of_i2c.h>
 
 #define DRIVER_NAME "nmk-i2c"
 
@@ -913,18 +915,42 @@ static struct nmk_i2c_controller u8500_i2c = {
         .sm             = I2C_FREQ_MODE_FAST,
 };
 
+static void nmk_i2c_of_probe(struct device_node *np,
+                        struct nmk_i2c_controller *pdata)
+{
+        of_property_read_u32(np, "clock-frequency", &pdata->clk_freq);
+
+        /* This driver only supports 'standard' and 'fast' modes of operation. */
+        if (pdata->clk_freq <= 100000)
+                pdata->sm = I2C_FREQ_MODE_STANDARD;
+        else
+                pdata->sm = I2C_FREQ_MODE_FAST;
+}
+
 static atomic_t adapter_id = ATOMIC_INIT(0);
 
 static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
 {
         int ret = 0;
         struct nmk_i2c_controller *pdata = adev->dev.platform_data;
+        struct device_node *np = adev->dev.of_node;
         struct nmk_i2c_dev      *dev;
         struct i2c_adapter *adap;
 
-        if (!pdata)
-                /* No i2c configuration found, using the default. */
-                pdata = &u8500_i2c;
+        if (!pdata) {
+                if (np) {
+                        pdata = devm_kzalloc(&adev->dev, sizeof(*pdata), GFP_KERNEL);
+                        if (!pdata) {
+                                ret = -ENOMEM;
+                                goto err_no_mem;
+                        }
+                        /* Provide the default configuration as a base. */
+                        memcpy(pdata, &u8500_i2c, sizeof(struct nmk_i2c_controller));
+                        nmk_i2c_of_probe(np, pdata);
+                } else
+                        /* No i2c configuration found, using the default. */
+                        pdata = &u8500_i2c;
+        }
 
         dev = kzalloc(sizeof(struct nmk_i2c_dev), GFP_KERNEL);
         if (!dev) {
@@ -960,6 +986,7 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
         }
 
         adap = &dev->adap;
+        adap->dev.of_node = np;
         adap->dev.parent = &adev->dev;
         adap->owner     = THIS_MODULE;
         adap->class     = I2C_CLASS_HWMON | I2C_CLASS_SPD;
@@ -989,6 +1016,8 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
                 goto err_add_adap;
         }
 
+        of_i2c_register_devices(adap);
+
         pm_runtime_put(&adev->dev);
 
         return 0;
diff --git a/include/linux/platform_data/i2c-nomadik.h b/include/linux/platform_data/i2c-nomadik.h
index c2303c3e4803..3a8be9cdc95c 100644
--- a/include/linux/platform_data/i2c-nomadik.h
+++ b/include/linux/platform_data/i2c-nomadik.h
@@ -28,7 +28,7 @@ enum i2c_freq_mode {
  * @sm:         speed mode
  */
 struct nmk_i2c_controller {
-        unsigned long   clk_freq;
+        u32             clk_freq;
         unsigned short  slsu;
         unsigned char   tft;
         unsigned char   rft;