i2c: rcar: add Device Tree support

This patch adds Device Tree support to the i2c-rcar driver and respective
documentation.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/Documentation/devicetree/bindings/i2c/i2c-rcar.txt b/Documentation/devicetree/bindings/i2c/i2c-rcar.txt
new file mode 100644 (file)
index 0000000..897cfcd
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-rcar.txt
@@ -0,0 +1,23 @@
+I2C for R-Car platforms
+
+Required properties:
+- compatible: Must be one of
+       "renesas,i2c-rcar"
+       "renesas,i2c-r8a7778"
+       "renesas,i2c-r8a7779"
+       "renesas,i2c-r8a7790"
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- interrupts: interrupt specifier.
+
+Optional properties:
+- clock-frequency: desired I2C bus clock frequency in Hz. The absence of this
+  propoerty indicates the default frequency 100 kHz.
+
+Examples :
+
+i2c0: i2c@e6500000 {
+       compatible = "renesas,i2c-rcar-h2";
+       reg = <0 0xe6500000 0 0x428>;
+       interrupts = <0 174 0x4>;
+};

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 9325db4..1f285a3 100644 (file)
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -33,6 +33,7 @@
 #include <linux/i2c/i2c-rcar.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
@@ -638,6 +639,15 @@ static const struct i2c_algorithm rcar_i2c_algo = {
        .functionality  = rcar_i2c_func,
 };
 
+static const struct of_device_id rcar_i2c_dt_ids[] = {
+       { .compatible = "renesas,i2c-rcar", .data = (void *)I2C_RCAR_H1 },
+       { .compatible = "renesas,i2c-r8a7778", .data = (void *)I2C_RCAR_H1 },
+       { .compatible = "renesas,i2c-r8a7779", .data = (void *)I2C_RCAR_H1 },
+       { .compatible = "renesas,i2c-r8a7790", .data = (void *)I2C_RCAR_H2 },
+       {},
+};
+MODULE_DEVICE_TABLE(of, rcar_i2c_dt_ids);
+
 static int rcar_i2c_probe(struct platform_device *pdev)
 {
        struct i2c_rcar_platform_data *pdata = dev_get_platdata(&pdev->dev);
@@ -655,10 +665,15 @@ static int rcar_i2c_probe(struct platform_device *pdev)
        }
 
        bus_speed = 100000; /* default 100 kHz */
-       if (pdata && pdata->bus_speed)
+       ret = of_property_read_u32(dev->of_node, "clock-frequency", &bus_speed);
+       if (ret < 0 && pdata && pdata->bus_speed)
                bus_speed = pdata->bus_speed;
 
-       priv->devtype = platform_get_device_id(pdev)->driver_data;
+       if (pdev->dev.of_node)
+               priv->devtype = (long)of_match_device(rcar_i2c_dt_ids,
+                                                     dev)->data;
+       else
+               priv->devtype = platform_get_device_id(pdev)->driver_data;
 
        ret = rcar_i2c_clock_calculate(priv, bus_speed, dev);
        if (ret < 0)
@@ -679,6 +694,7 @@ static int rcar_i2c_probe(struct platform_device *pdev)
        adap->class             = I2C_CLASS_HWMON | I2C_CLASS_SPD;
        adap->retries           = 3;
        adap->dev.parent        = dev;
+       adap->dev.of_node       = dev->of_node;
        i2c_set_adapdata(adap, priv);
        strlcpy(adap->name, pdev->name, sizeof(adap->name));
 
@@ -726,6 +742,7 @@ static struct platform_driver rcar_i2c_driver = {
        .driver = {
                .name   = "i2c-rcar",
                .owner  = THIS_MODULE,
+               .of_match_table = rcar_i2c_dt_ids,
        },
        .probe          = rcar_i2c_probe,
        .remove         = rcar_i2c_remove,