Separate Z_PROBE_ALLEN_KEY from MECHANICAL_PROBE

Marlin/Conditionals.h

@@ -387,13 +387,6 @@
     #endif
   #endif
 
-  /**
-   * Enable MECHANICAL_PROBE for Z_PROBE_ALLEN_KEY, for older configs
-   */
-  #if ENABLED(Z_PROBE_ALLEN_KEY)
-    #define MECHANICAL_PROBE
-  #endif
-
   /**
    * Host keep alive
    */
@@ -742,7 +735,7 @@
     #endif
   #endif
 
-  #define PROBE_SELECTED (ENABLED(FIX_MOUNTED_PROBE) || ENABLED(MECHANICAL_PROBE) || HAS_Z_ENDSTOP_SERVO || ENABLED(Z_PROBE_SLED))
+  #define PROBE_SELECTED (ENABLED(FIX_MOUNTED_PROBE) || ENABLED(MECHANICAL_PROBE) || ENABLED(Z_PROBE_ALLEN_KEY) || HAS_Z_ENDSTOP_SERVO || ENABLED(Z_PROBE_SLED))
 
   #define PROBE_PIN_CONFIGURED (HAS_Z_MIN_PROBE_PIN || (HAS_Z_MIN && ENABLED(Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN)))
 

Marlin/Marlin_main.cpp

@@ -3238,7 +3238,7 @@ inline void gcode_G28() {
 
     #if ENABLED(Z_PROBE_SLED)
       dock_sled(false); // engage (un-dock) the Z probe
-    #elif ENABLED(MECHANICAL_PROBE) || ENABLED(FIX_MOUNTED_PROBE) || (ENABLED(DELTA) && SERVO_LEVELING)
+    #elif ENABLED(FIX_MOUNTED_PROBE) || ENABLED(MECHANICAL_PROBE) || ENABLED(Z_PROBE_ALLEN_KEY) || (ENABLED(DELTA) && SERVO_LEVELING)
       deploy_z_probe();
     #endif
 

Marlin/SanityCheck.h

@@ -237,8 +237,9 @@
   /**
    * Only allow one probe option to be defined
    */
-  #if (ENABLED(FIX_MOUNTED_PROBE) && (ENABLED(MECHANICAL_PROBE) || HAS_Z_ENDSTOP_SERVO || ENABLED(Z_PROBE_SLED))) \
-       || (ENABLED(MECHANICAL_PROBE) && (HAS_Z_ENDSTOP_SERVO || ENABLED(Z_PROBE_SLED))) \
+  #if (ENABLED(FIX_MOUNTED_PROBE) && (ENABLED(MECHANICAL_PROBE) || ENABLED(Z_PROBE_ALLEN_KEY) || HAS_Z_ENDSTOP_SERVO || ENABLED(Z_PROBE_SLED))) \
+       || (ENABLED(MECHANICAL_PROBE) && (ENABLED(Z_PROBE_ALLEN_KEY) || HAS_Z_ENDSTOP_SERVO || ENABLED(Z_PROBE_SLED))) \
+       || (ENABLED(Z_PROBE_ALLEN_KEY) && (HAS_Z_ENDSTOP_SERVO || ENABLED(Z_PROBE_SLED))) \
        || (HAS_Z_ENDSTOP_SERVO && ENABLED(Z_PROBE_SLED))
     #error "Please define only one type of probe: Z Servo, MECHANICAL_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or FIX_MOUNTED_PROBE."
   #endif