ASRock X370 Gaming K4

Values as per nuvoton nct6779D datasheetSection 8.5 Analog Inputs (Page 54,55).

Is based on nct6779 which uses a 2.048V input range, all inputs above that are scaled using a voltage divider.
Specific inputs like the ADC, AVCC, VBAT, 3VSB and 3VCC utilize an integrated voltage divider.

Signed-off-by: Rigo Reddig <rigo.reddig@gmail.com>

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+# ASRock X370 Gaming K4
+# 2018, contributed by Rigo Reddig <rigo.reddig@gmail.com>
+#
+# dmi: board_name:   X370 Gaming K4
+# dmi: board_vendor: ASRock
+# dmi: bios_version: P4.70
+# cpu: AMD Ryzen 7 1700X Eight-Core Processor
+chip "nct6779-isa-*"
+
+    # Fans
+    label fan1 "Chassis Fan 3 Speed"
+    label fan2 "CPU Fan 1 Speed"
+    label fan3 "CPU Fan 2 Speed"
+    label fan4 "Chassis Fan 1 Speed"
+    label fan5 "Chassis Fan 2 Speed"
+
+    # Temperatures
+    label temp1 "Motherboard"
+    label temp2 "CPU MB"
+    label temp3 "Auxillary"
+    label temp4 "VRM"
+    label temp5 "AUXTIN2"
+    
+    # temp6 is almost always at -25. Not certain what to do about this.
+    label temp6 "CPU (PECI)" 
+    
+    # temp7 (CPU tCTL) A Thermal BIAS value generated by CPU 
+    # it includes an offset it is usedto drive mainboard Fans to higher speeds.
+    
+    # temp7 value is rounded off to the nearest ~1C only reported if
+    # "Use Tctrl" has been selected in UEFI as the fan control sensor.
+    
+    # It will likely be offset by 20/10C on Ryzen X series CPU's
+    label temp7 "CPU tCTL"
+
+    # Voltages
+    
+    # VCore is different to VDDCR_CPU
+    # VCore is a voltage measured somewhere by the Firmware.
+    # (Readings may appear low at times (0.54V) and fluctuate - this is normal)
+    label in0 "VCore"
+    label in1 "VPPM" #scalar
+    label in2 "AVCC"
+    label in3 "3VCC"
+    label in4 "+12V" #scalar
+    label in5 "VDDCR_SOC" #(Data Fabric)
+    label in6 "DRAM (VDDIO)"
+    label in7 "3VSB"
+    label in8 "VBat"
+    ignore in9 #Unused input that is always at 0.
+    label in10 "Mem_VTT" #(1/2 of VDDIO)
+    label in11 "Chipset 1.05V"
+    label in12 "+5V"
+    label in13 "VDDP"
+    label in14 "1.8V+"
+
+    # CPU VCore limits set according to overclockers testing and AMD Max Safe 
+    # voltage recommendations.
+    # Keep in mind Ryzen CPU's may boost to higher voltages for short times. 
+    # This is entirely dependant on individual chip binning.
+    # If your chip indicates 1.55V continuously the sensors may not be treated 
+    # correctly by your mainboard or you have buggy firmware.
+    # In that case It might be actually 1.55V which would correlates with 
+    # high heat, or it may be just a bad readout.
+    
+    # Note: sustained 1.45 is also not safe.
+    # I am not sure about the low load voltage drops, they are normal
+    # (commonly occuring on many boards) and thus likely a measurement or 
+    # sensor anomaly.
+    # There is a more accurate on-die voltage sensor with ryzen.
+    # but the documentation is covered by NDA. k10-temp would need to be 
+    # adapated to read voltages in addition to temperatures like HWInfo64 on 
+    # Windows already does.
+    set in0_min 0.40 #Possibly inaccurate at low voltages. 
+    set in0_max 1.45
+
+    # VPPM Voltage 5%
+    set in1_min 2.50 * 0.95
+    set in1_max 2.50 * 1.05
+    
+    # Most PSU voltages set according to ATX v2.2 spec +/- 5% on the following:
+    # +3.3VDC	± 5%	+3.135 VDC	+3.465 VDC
+    # +5VDC	    ± 5%	+4.750 VDC	+5.250 VDC
+    # +5VSB 	± 5%	+4.750 VDC	+5.250 VDC
+    # -5VDC     ± 10%	-4.500 VDC	-5.500 VDC
+    # +12VDC	± 5%	+11.400 VDC	+12.600 VDC
+    # -12VDC	± 10%	-10.800 VDC	-13.200 VDC
+    
+    # +12VDC
+    set in4_min 12 * 0.95
+    set in4_max 12 * 1.05
+
+    # VDDCR_SOC (fabric & peripheral) voltage levels
+    # This can vary largely from board to board and among CPU's
+    set in5_min 0.80
+    set in5_max 1.20
+
+    # DDR 4 RAM Tolerances VDDIO (1.2V DDR4 JEDEC standard)
+    set in6_min 1.10 #Underclocking
+    set in6_max 1.50 #Intel XMP2.0 recommended max safe voltage
+    
+    # Memory VTT Voltages (this should correspond to approximately VDDIO/2)
+    set in10_min 1.20 * 0.5 #Stock Voltage
+    set in10_max 1.50 * 0.5 #Overclocked XMP Voltage
+
+    # Uncertain tolerances for the Ryzen Chipset
+    set in11_min 0.90 #Undervolting
+    set in11_max 1.20 #Overvolting
+    
+    set in12_min 5 * 0.95
+    set in12_max 5 * 1.05
+
+    # CLDO_VDDP Magic - helps to set to 1.0V when RAM overclocking or on XMP
+    set in13_min 0.95 * 0.96
+    set in13_max 0.95 * 1.13
+
+    # PLL (Phase locked loop) voltage on the CPU. 
+    set in14_min 1.8 * 0.98
+    set in14_max 1.8 * 1.02
+
+    # Compute Inputs
+    # The nct6779D uses a 2.048V input range, all inputs above that are scaled 
+    # using a voltage divider.
+    # Below inputs utilize an integrated voltage divider:
+    # ADC, AVCC, VBAT, 3VSB and 3VCC 
+    #
+    # values as per nuvoton nct6779D datasheet
+    # Section 8.5 Analog Inputs (Page 54,55)
+    # #       Vs     R1,Rin   R2,Rf    Vin
+    # in4  +12.0     56       10     ~+1.84
+    # in12  +5.0     20       10     ~+1.67
+    #
+    compute in0 @*2, @/2
+    compute in1 @*2, @/2
+    compute in4 ((56/10)+1)*@, @/((56/10)+1)
+    compute in12 ((20/10)+1)*@, @/((20/10)+1)
+
+
+    # Potential things to filter
+    # These inputs are unused unless you have a case intrusion switch connected.
+    #ignore intrusion0
+    #ignore intrusion1