3 files changed, 30 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/i2c/ina2xx.txt b/Documentation/devicetree/bindings/i2c/ina2xx.txt
new file mode 100644
index 000000000000..a2ad85d7e747
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/ina2xx.txt
@@ -0,0 +1,22 @@
+ina2xx properties
+
+Required properties:
+- compatible: Must be one of the following:
+        - "ti,ina219" for ina219
+        - "ti,ina220" for ina220
+        - "ti,ina226" for ina226
+        - "ti,ina230" for ina230
+- reg: I2C address
+
+Optional properties:
+
+- shunt-resistor
+        Shunt resistor value in micro-Ohm
+
+Example:
+
+ina220@44 {
+        compatible = "ti,ina220";
+        reg = <0x44>;
+        shunt-resistor = <1000>;
+};
diff --git a/Documentation/hwmon/ina2xx b/Documentation/hwmon/ina2xx
index 03444f9d833f..4223c2d3b508 100644
--- a/Documentation/hwmon/ina2xx
+++ b/Documentation/hwmon/ina2xx
@@ -44,4 +44,6 @@ The INA226 monitors both a shunt voltage drop and bus supply voltage.
 The INA230 is a high or low side current shunt and power monitor with an I2C
 interface. The INA230 monitors both a shunt voltage drop and bus supply voltage.
 
-The shunt value in micro-ohms can be set via platform data.
+The shunt value in micro-ohms can be set via platform data or device tree.
+Please refer to the Documentation/devicetree/bindings/i2c/ina2xx.txt for bindings
+if the device tree is used.
diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c
index 4958b2f89dce..d917a2d8c30f 100644
--- a/drivers/hwmon/ina2xx.c
+++ b/drivers/hwmon/ina2xx.c
@@ -34,6 +34,7 @@
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/jiffies.h>
+#include <linux/of.h>
 
 #include <linux/platform_data/ina2xx.h>
 
@@ -221,6 +222,7 @@ static int ina2xx_probe(struct i2c_client *client,
         struct ina2xx_data *data;
         struct ina2xx_platform_data *pdata;
         int ret;
+        u32 val;
         long shunt = 10000; /* default shunt value 10mOhms */
 
         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
@@ -234,6 +236,9 @@ static int ina2xx_probe(struct i2c_client *client,
                 pdata =
                   (struct ina2xx_platform_data *)client->dev.platform_data;
                 shunt = pdata->shunt_uohms;
+        } else if (!of_property_read_u32(client->dev.of_node,
+                                "shunt-resistor", &val)) {
+                        shunt = val;
         }
 
         if (shunt <= 0)