diff --git a/klippy/extras/tmc.py b/klippy/extras/tmc.py
index 5b606e26..8afc972b 100644
--- a/klippy/extras/tmc.py
+++ b/klippy/extras/tmc.py
@@ -48,10 +48,9 @@ class FieldHelper:
         new_value = (reg_value & ~mask) | ((field_value << ffs(mask)) & mask)
         self.registers[reg_name] = new_value
         return new_value
-    def set_config_field(self, config, field_name, default, config_name=None):
+    def set_config_field(self, config, field_name, default):
         # Allow a field to be set from the config file
-        if config_name is None:
-            config_name = "driver_" + field_name.upper()
+        config_name = "driver_" + field_name.upper()
         reg_name = self.field_to_register[field_name]
         mask = self.all_fields[reg_name][field_name]
         maxval = mask >> ffs(mask)
@@ -248,6 +247,7 @@ class TMCMicrostepHelper:
                  '8': 5, '4': 6, '2': 7, '1': 8}
         mres = config.getchoice('microsteps', steps)
         self.fields.set_field("MRES", mres)
+        self.fields.set_field("intpol", config.getboolean("interpolate", True))
     def get_microsteps(self):
         return 256 >> self.fields.get_field("MRES")
     def get_phase(self):
diff --git a/klippy/extras/tmc2130.py b/klippy/extras/tmc2130.py
index aa31f90b..e6a27a43 100644
--- a/klippy/extras/tmc2130.py
+++ b/klippy/extras/tmc2130.py
@@ -226,7 +226,6 @@ class TMC2130:
         set_config_field(config, "hstrt", 0)
         set_config_field(config, "hend", 7)
         set_config_field(config, "TBL", 1)
-        set_config_field(config, "intpol", True, "interpolate")
         set_config_field(config, "IHOLDDELAY", 8)
         set_config_field(config, "TPOWERDOWN", 0)
         set_config_field(config, "PWM_AMPL", 128)
diff --git a/klippy/extras/tmc2208.py b/klippy/extras/tmc2208.py
index 6b004fb1..93a4aee9 100644
--- a/klippy/extras/tmc2208.py
+++ b/klippy/extras/tmc2208.py
@@ -207,7 +207,6 @@ class TMC2208:
         set_config_field(config, "hstrt", 5)
         set_config_field(config, "hend", 0)
         set_config_field(config, "TBL", 2)
-        set_config_field(config, "intpol", True, "interpolate")
         set_config_field(config, "IHOLDDELAY", 8)
         set_config_field(config, "TPOWERDOWN", 20)
         set_config_field(config, "PWM_OFS", 36)
diff --git a/klippy/extras/tmc2209.py b/klippy/extras/tmc2209.py
index 02ff3c7e..45072446 100644
--- a/klippy/extras/tmc2209.py
+++ b/klippy/extras/tmc2209.py
@@ -79,7 +79,6 @@ class TMC2209:
         set_config_field(config, "hstrt", 5)
         set_config_field(config, "hend", 0)
         set_config_field(config, "TBL", 2)
-        set_config_field(config, "intpol", True, "interpolate")
         set_config_field(config, "IHOLDDELAY", 8)
         set_config_field(config, "TPOWERDOWN", 20)
         set_config_field(config, "PWM_OFS", 36)
diff --git a/klippy/extras/tmc2660.py b/klippy/extras/tmc2660.py
index e1dd7531..056ccfe1 100644
--- a/klippy/extras/tmc2660.py
+++ b/klippy/extras/tmc2660.py
@@ -19,7 +19,7 @@ Fields = {}
 Fields["DRVCTRL"] = {
     "MRES": 0x0f,
     "DEDGE": 0x01 << 8,
-    "INTPOL": 0x01 << 9,
+    "intpol": 0x01 << 9,
 }
 
 Fields["CHOPCONF"] = {
@@ -100,7 +100,7 @@ FieldFormatters = {
     "MRES": (lambda v: "%d(%dusteps)" % (v, 0x100 >> v)),
     "DEDGE": (lambda v:
         "1(Both Edges Active)" if v else "0(Only Rising Edge active)"),
-    "INTPOL": (lambda v: "1(On)" if v else "0(Off)"),
+    "intpol": (lambda v: "1(On)" if v else "0(Off)"),
     "toff": (lambda v: ("%d" % v) if v else "0(Driver Disabled!)"),
     "CHM": (lambda v: "1(constant toff)" if v else "0(spreadCycle)"),
     "SFILT": (lambda v: "1(Filtered mode)" if v else "0(Standard mode)"),
@@ -252,9 +252,8 @@ class TMC2660:
         mh = tmc.TMCMicrostepHelper(config, self.mcu_tmc)
         self.get_microsteps = mh.get_microsteps
         self.get_phase = mh.get_phase
-        set_config_field = self.fields.set_config_field
-        set_config_field(config, "INTPOL", True, 'interpolate')
         # CHOPCONF
+        set_config_field = self.fields.set_config_field
         set_config_field(config, "TBL", 2)
         set_config_field(config, "RNDTF", 0)
         set_config_field(config, "HDEC", 0)
diff --git a/klippy/extras/tmc5160.py b/klippy/extras/tmc5160.py
index 48158e2a..9102f4b8 100644
--- a/klippy/extras/tmc5160.py
+++ b/klippy/extras/tmc5160.py
@@ -314,7 +314,6 @@ class TMC5160:
         set_config_field(config, "vhighfs", 0)
         set_config_field(config, "vhighchm", 0)
         set_config_field(config, "tpfd", 4)
-        set_config_field(config, "intpol", True, "interpolate")
         set_config_field(config, "diss2g", 0)
         set_config_field(config, "diss2vs", 0)
         #   COOLCONF
diff --git a/test/klippy/tmc.test b/test/klippy/tmc.test
index 79a42685..44053463 100644
--- a/test/klippy/tmc.test
+++ b/test/klippy/tmc.test
@@ -42,4 +42,4 @@ SET_TMC_FIELD STEPPER=stepper_x1 FIELD=intpol VALUE=0
 SET_TMC_FIELD STEPPER=stepper_y FIELD=intpol VALUE=0
 SET_TMC_FIELD STEPPER=stepper_y1 FIELD=intpol VALUE=0
 SET_TMC_FIELD STEPPER=stepper_z FIELD=intpol VALUE=0
-SET_TMC_FIELD STEPPER=stepper_z1 FIELD=INTPOL VALUE=0
+SET_TMC_FIELD STEPPER=stepper_z1 FIELD=intpol VALUE=0