hwmon: Driver for Maxim MAX6697 and compatibles

Add support for MAX6581, MAX6602, MAX6622, MAX6636, MAX6689, MAX6693,
MAX6694, MAX6697, MAX6698, and MAX6699 temperature sensors

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <khali@linux-fr.org>

Documentation/devicetree/bindings/i2c/max6697.txt

@@ -0,0 +1,64 @@
+max6697 properties
+
+Required properties:
+- compatible:
+	Should be one of
+		maxim,max6581
+		maxim,max6602
+		maxim,max6622
+		maxim,max6636
+		maxim,max6689
+		maxim,max6693
+		maxim,max6694
+		maxim,max6697
+		maxim,max6698
+		maxim,max6699
+- reg: I2C address
+
+Optional properties:
+
+- smbus-timeout-disable
+	Set to disable SMBus timeout. If not specified, SMBus timeout will be
+	enabled.
+- extended-range-enable
+	Only valid for MAX6581. Set to enable extended temperature range.
+	Extended temperature will be disabled if not specified.
+- beta-compensation-enable
+	Only valid for MAX6693 and MX6694. Set to enable beta compensation on
+	remote temperature channel 1.
+	Beta compensation will be disabled if not specified.
+- alert-mask
+	Alert bit mask. Alert disabled for bits set.
+	Select bit 0 for local temperature, bit 1..7 for remote temperatures.
+	If not specified, alert will be enabled for all channels.
+- over-temperature-mask
+	Over-temperature bit mask. Over-temperature reporting disabled for
+	bits set.
+	Select bit 0 for local temperature, bit 1..7 for remote temperatures.
+	If not specified, over-temperature reporting will be enabled for all
+	channels.
+- resistance-cancellation
+	Boolean for all chips other than MAX6581. Set to enable resistance
+	cancellation on remote temperature channel 1.
+	For MAX6581, resistance cancellation enabled for all channels if
+	specified as boolean, otherwise as per bit mask specified.
+	Only supported for remote temperatures (bit 1..7).
+	If not specified, resistance cancellation will be disabled for all
+	channels.
+- transistor-ideality
+	For MAX6581 only. Two values; first is bit mask, second is ideality
+	select value as per MAX6581 data sheet. Select bit 1..7 for remote
+	channels.
+	Transistor ideality will be initialized to default (1.008) if not
+	specified.
+
+Example:
+
+temp-sensor@1a {
+	compatible = "maxim,max6697";
+	reg = <0x1a>;
+	smbus-timeout-disable;
+	resistance-cancellation;
+	alert-mask = <0x72>;
+	over-temperature-mask = <0x7f>;
+};