i2c: stu300: device tree support

This adds device tree support for the ST DDC I2C driver known
as "stu300" in the kernel tree.

Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/Documentation/devicetree/bindings/i2c/i2c-st-ddci2c.txt b/Documentation/devicetree/bindings/i2c/i2c-st-ddci2c.txt
new file mode 100644 (file)
index 0000000..bd81a48
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-st-ddci2c.txt
@@ -0,0 +1,15 @@
+ST Microelectronics DDC I2C
+
+Required properties :
+- compatible : Must be "st,ddci2c"
+- 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 :
+

diff --git a/drivers/i2c/busses/i2c-stu300.c b/drivers/i2c/busses/i2c-stu300.c
index 0a6f941..1beaa05 100644 (file)
--- a/drivers/i2c/busses/i2c-stu300.c
+++ b/drivers/i2c/busses/i2c-stu300.c
@@ -17,6 +17,7 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/slab.h>
+#include <linux/of_i2c.h>
 
 /* the name of this kernel module */
 #define NAME "stu300"
@@ -923,6 +924,7 @@ stu300_probe(struct platform_device *pdev)
        adap->nr = bus_nr;
        adap->algo = &stu300_algo;
        adap->dev.parent = &pdev->dev;
+       adap->dev.of_node = pdev->dev.of_node;
        i2c_set_adapdata(adap, dev);
 
        /* i2c device drivers may be active on return from add_adapter() */
@@ -934,6 +936,10 @@ stu300_probe(struct platform_device *pdev)
        }
 
        platform_set_drvdata(pdev, dev);
+       dev_info(&pdev->dev, "ST DDC I2C @ %p, irq %d\n",
+                dev->virtbase, dev->irq);
+       of_i2c_register_devices(adap);
+
        return 0;
 }
 
@@ -978,11 +984,17 @@ stu300_remove(struct platform_device *pdev)
        return 0;
 }
 
+static const struct of_device_id stu300_dt_match[] = {
+       { .compatible = "st,ddci2c" },
+       {},
+};
+
 static struct platform_driver stu300_i2c_driver = {
        .driver = {
                .name   = NAME,
                .owner  = THIS_MODULE,
                .pm     = STU300_I2C_PM,
+               .of_match_table = stu300_dt_match,
        },
        .remove         = __exit_p(stu300_remove),