[PATCHv1 3/3] hwmon: Add DT documentation for g762 driver

[Arnaud Ebalard]

Signed-off-by: Arnaud Ebalard <arno at natisbad.org>
---
 Documentation/devicetree/bindings/hwmon/g762.txt |   57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/g762.txt

diff --git a/Documentation/devicetree/bindings/hwmon/g762.txt b/Documentation/devicetree/bindings/hwmon/g762.txt
new file mode 100644
index 0000000..87d7cf5
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/g762.txt
@@ -0,0 +1,57 @@
+GMT G762/G763 PWM Fan controller
+
+Required node properties:
+
+ - "compatible": must be either "gmt,g762" or "gmt,g763"
+ - "reg": I2C bus address of the device
+
+Optional properties:
+
+ - "pwm_mode": fan driving mode. 1 for PWM mode, 0 for linear. Default
+               value is 0, i.e. linear.
+
+ - "pwm_enable": fan speed control. 1 for open-loop, 2 for closed-loop.
+               Default value is 2, i.e. closed-loop.
+
+ - "pwm_freq": reference clock frequency for PWM mode in Hz. Default is
+               32768.
+
+ - "fan_pulses": number of pulses per fan revolution. Supported values
+               are 2 and 4. Default is 2.
+
+ - "fan_div": fan clock frequency divisor value. Supported values are 1,
+               2, 4 and 8. Default is 1.
+
+ - "fan_target": initial target fan speed in RPM. By default, current
+               value is not modified. Only works in closed-loop fan speed
+	       control, i.e. when pwm_enable has already been set to 2.
+
+ - "fan_startv": fan startup voltage. Accepted values are 0, 1, 2 and 3.
+               Default value is 1. The higher the more.
+
+ - "pwm_polarity": pwm polarity. Accepted values are 0 (positive duty)
+               and 1 (negative duty). Default is 0 i.e. positive duty.
+
+ - "fan_gear_mode": fan gear mode. Supported values are 0, 1 and 2.
+               Default is 0.
+
+
+Additional information on operational parameters for the device is available
+in Documentation/hwmon/g762. A detailed datasheet for the device is available
+at http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf.
+
+Example g762 node:
+
+   g762: g762 at 3e {
+        compatible = "gmt,g762";
+   	reg = <0x3e>;
+   	pwm_mode = <1>;      /* closed-loop control */
+   	pwm_enable = <2>;    /* PWM mode */
+   	pwm_freq = <8192>;   /* PWM reference clock freq */
+   	fan_pulses = <2>;    /* 2 pulses per rev */
+   	fan_div = <2>;       /* fan clock divisor */
+   	fan_target = <2000>; /* target fan speed at 2000 RPM */
+        fan_gear_mode = <0>; /* default */
+        fan_startv = <1>;    /* default */
+        pwm_polarity = <0>;  /* default */
+   };
-- 
1.7.10.4