iio:ak8975 Add support for gpios DT property

Add support for parsing 'gpios' property when initializing
from oftree.
This patch adds also the binding documentation file.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt
new file mode 100644 (file)
index 0000000..011679f
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt
@@ -0,0 +1,18 @@
+* AsahiKASEI AK8975 magnetometer sensor
+
+Required properties:
+
+  - compatible : should be "asahi-kasei,ak8975"
+  - reg : the I2C address of the magnetometer
+
+Optional properties:
+
+  - gpios : should be device tree identifier of the magnetometer DRDY pin
+
+Example:
+
+ak8975@0c {
+        compatible = "asahi-kasei,ak8975";
+        reg = <0x0c>;
+        gpios = <&gpj0 7 0>;
+};

diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index af6c320a534ee8a0a7a5e03c5ed628928610603b..d75cc23e8ae7fbf9170e0c69ad28e42b017a0d60 100644 (file)
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -29,6 +29,7 @@
 #include <linux/delay.h>
 
 #include <linux/gpio.h>
+#include <linux/of_gpio.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -384,10 +385,15 @@ static int ak8975_probe(struct i2c_client *client,
        int err;
 
        /* Grab and set up the supplied GPIO. */
-       if (client->dev.platform_data == NULL)
-               eoc_gpio = -1;
-       else
+       if (client->dev.platform_data)
                eoc_gpio = *(int *)(client->dev.platform_data);
+       else if (client->dev.of_node)
+               eoc_gpio = of_get_gpio(client->dev.of_node, 0);
+       else
+               eoc_gpio = -1;
+
+       if (eoc_gpio == -EPROBE_DEFER)
+               return -EPROBE_DEFER;
 
        /* We may not have a GPIO based IRQ to scan, that is fine, we will
           poll if so */