hwmon: (nct6775) Add support for NCT6796D

NCT6796D is mostly compatible to NCT6795D. It supports an additional
pwm control and fan speed channel.

While we are at it, update documentation for NCT6795D.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/nct6775

@@ -36,6 +36,14 @@ Supported chips:
     Prefix: 'nct6793'
     Addresses scanned: ISA address retrieved from Super I/O registers
     Datasheet: Available from Nuvoton upon request
+  * Nuvoton NCT6795D
+    Prefix: 'nct6795'
+    Addresses scanned: ISA address retrieved from Super I/O registers
+    Datasheet: Available from Nuvoton upon request
+  * Nuvoton NCT6796D
+    Prefix: 'nct6796'
+    Addresses scanned: ISA address retrieved from Super I/O registers
+    Datasheet: Available from Nuvoton upon request
 
 Authors:
         Guenter Roeck <linux@roeck-us.net>
@@ -88,10 +96,10 @@ The mode works for fan1-fan5.
 sysfs attributes
 ----------------
 
-pwm[1-5] - this file stores PWM duty cycle or DC value (fan speed) in range:
+pwm[1-7] - this file stores PWM duty cycle or DC value (fan speed) in range:
 	   0 (lowest speed) to 255 (full)
 
-pwm[1-5]_enable - this file controls mode of fan/temperature control:
+pwm[1-7]_enable - this file controls mode of fan/temperature control:
 	* 0 Fan control disabled (fans set to maximum speed)
 	* 1 Manual mode, write to pwm[0-5] any value 0-255
 	* 2 "Thermal Cruise" mode
@@ -99,16 +107,16 @@ pwm[1-5]_enable - this file controls mode of fan/temperature control:
 	* 4 "Smart Fan III" mode (NCT6775F only)
 	* 5 "Smart Fan IV" mode
 
-pwm[1-5]_mode - controls if output is PWM or DC level
+pwm[1-7]_mode - controls if output is PWM or DC level
         * 0 DC output
         * 1 PWM output
 
 Common fan control attributes
 -----------------------------
 
-pwm[1-5]_temp_sel	Temperature source. Value is temperature sensor index.
+pwm[1-7]_temp_sel	Temperature source. Value is temperature sensor index.
 			For example, select '1' for temp1_input.
-pwm[1-5]_weight_temp_sel
+pwm[1-7]_weight_temp_sel
 			Secondary temperature source. Value is temperature
 			sensor index. For example, select '1' for temp1_input.
 			Set to 0 to disable secondary temperature control.
@@ -116,16 +124,16 @@ pwm[1-5]_weight_temp_sel
 If secondary temperature functionality is enabled, it is controlled with the
 following attributes.
 
-pwm[1-5]_weight_duty_step
+pwm[1-7]_weight_duty_step
 			Duty step size.
-pwm[1-5]_weight_temp_step
+pwm[1-7]_weight_temp_step
 			Temperature step size. With each step over
 			temp_step_base, the value of weight_duty_step is added
 			to the current pwm value.
-pwm[1-5]_weight_temp_step_base
+pwm[1-7]_weight_temp_step_base
 			Temperature at which secondary temperature control kicks
 			in.
-pwm[1-5]_weight_temp_step_tol
+pwm[1-7]_weight_temp_step_tol
 			Temperature step tolerance.
 
 Thermal Cruise mode (2)
@@ -133,9 +141,9 @@ Thermal Cruise mode (2)
 
 If the temperature is in the range defined by:
 
-pwm[1-5]_target_temp	Target temperature, unit millidegree Celsius
+pwm[1-7]_target_temp	Target temperature, unit millidegree Celsius
 			(range 0 - 127000)
-pwm[1-5]_temp_tolerance
+pwm[1-7]_temp_tolerance
 			Target temperature tolerance, unit millidegree Celsius
 
 there are no changes to fan speed. Once the temperature leaves the interval, fan
@@ -143,14 +151,14 @@ speed increases (if temperature is higher that desired) or decreases (if
 temperature is lower than desired), using the following limits and time
 intervals.
 
-pwm[1-5]_start		fan pwm start value (range 1 - 255), to start fan
+pwm[1-7]_start		fan pwm start value (range 1 - 255), to start fan
 			when the temperature is above defined range.
-pwm[1-5]_floor		lowest fan pwm (range 0 - 255) if temperature is below
+pwm[1-7]_floor		lowest fan pwm (range 0 - 255) if temperature is below
 			the defined range. If set to 0, the fan is expected to
 			stop if the temperature is below the defined range.
-pwm[1-5]_step_up_time	milliseconds before fan speed is increased
-pwm[1-5]_step_down_time	milliseconds before fan speed is decreased
-pwm[1-5]_stop_time	how many milliseconds must elapse to switch
+pwm[1-7]_step_up_time	milliseconds before fan speed is increased
+pwm[1-7]_step_down_time	milliseconds before fan speed is decreased
+pwm[1-7]_stop_time	how many milliseconds must elapse to switch
 			corresponding fan off (when the temperature was below
 			defined range).
 
@@ -159,8 +167,8 @@ Speed Cruise mode (3)
 
 This modes tries to keep the fan speed constant.
 
-fan[1-5]_target		Target fan speed
-fan[1-5]_tolerance
+fan[1-7]_target		Target fan speed
+fan[1-7]_tolerance
 			Target speed tolerance
 
 
@@ -177,19 +185,19 @@ points should be set to higher temperatures and higher pwm values to achieve
 higher fan speeds with increasing temperature. The last data point reflects
 critical temperature mode, in which the fans should run at full speed.
 
-pwm[1-5]_auto_point[1-7]_pwm
+pwm[1-7]_auto_point[1-7]_pwm
 			pwm value to be set if temperature reaches matching
 			temperature range.
-pwm[1-5]_auto_point[1-7]_temp
+pwm[1-7]_auto_point[1-7]_temp
 			Temperature over which the matching pwm is enabled.
-pwm[1-5]_temp_tolerance
+pwm[1-7]_temp_tolerance
 			Temperature tolerance, unit millidegree Celsius
-pwm[1-5]_crit_temp_tolerance
+pwm[1-7]_crit_temp_tolerance
 			Temperature tolerance for critical temperature,
 			unit millidegree Celsius
 
-pwm[1-5]_step_up_time	milliseconds before fan speed is increased
-pwm[1-5]_step_down_time	milliseconds before fan speed is decreased
+pwm[1-7]_step_up_time	milliseconds before fan speed is increased
+pwm[1-7]_step_down_time	milliseconds before fan speed is decreased
 
 Usage Notes
 -----------