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@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
.../bindings/iio/magnetometer/ak8975.txt | 18 ++++++++++++++++++
drivers/iio/magnetometer/ak8975.c | 12 +++++++++---
2 files changed, 27 insertions(+), 3 deletions(-)
create mode 100644 Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt
diff --git a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt
new file mode 100644
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 af6c320..d75cc23 100644
--- 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 */
--
1.7.5.4
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