📌 'STOP' auto-assign, some Chitu V9 pins (#22889)

Co-authored-by: Scott Lahteine <github@thinkyhead.com>

Marlin/src/core/macros.h

 
 #define _AXIS(A) (A##_AXIS)
 
+#define _XSTOP_  0x01
+#define _YSTOP_  0x02
+#define _ZSTOP_  0x03
+#define _ISTOP_  0x04
+#define _JSTOP_  0x05
+#define _KSTOP_  0x06
 #define _XMIN_   0x11
 #define _YMIN_   0x12
 #define _ZMIN_   0x13

Marlin/src/inc/Conditionals_post.h

         #define X2_MAX_ENDSTOP_INVERTING false
       #endif
     #endif
-    #ifndef X2_MAX_PIN
+    #if !defined(X2_MAX_PIN) && !defined(X2_STOP_PIN)
       #if X2_USE_ENDSTOP == _XMIN_
         #define X2_MAX_PIN X_MIN_PIN
       #elif X2_USE_ENDSTOP == _XMAX_
         #define X2_MAX_PIN X_MAX_PIN
+      #elif X2_USE_ENDSTOP == _XSTOP_
+        #define X2_MAX_PIN X_STOP_PIN
       #elif X2_USE_ENDSTOP == _YMIN_
         #define X2_MAX_PIN Y_MIN_PIN
       #elif X2_USE_ENDSTOP == _YMAX_
         #define X2_MAX_PIN Y_MAX_PIN
+      #elif X2_USE_ENDSTOP == _YSTOP_
+        #define X2_MAX_PIN Y_STOP_PIN
       #elif X2_USE_ENDSTOP == _ZMIN_
         #define X2_MAX_PIN Z_MIN_PIN
       #elif X2_USE_ENDSTOP == _ZMAX_
         #define X2_MAX_PIN Z_MAX_PIN
+      #elif X2_USE_ENDSTOP == _ZSTOP_
+        #define X2_MAX_PIN Z_STOP_PIN
       #elif X2_USE_ENDSTOP == _XDIAG_
         #define X2_MAX_PIN X_DIAG_PIN
       #elif X2_USE_ENDSTOP == _YDIAG_
         #define X2_MIN_ENDSTOP_INVERTING false
       #endif
     #endif
-    #ifndef X2_MIN_PIN
+    #if !defined(X2_MIN_PIN) && !defined(X2_STOP_PIN)
       #if X2_USE_ENDSTOP == _XMIN_
         #define X2_MIN_PIN X_MIN_PIN
       #elif X2_USE_ENDSTOP == _XMAX_
         #define X2_MIN_PIN X_MAX_PIN
+      #elif X2_USE_ENDSTOP == _XSTOP_
+        #define X2_MIN_PIN X_STOP_PIN
       #elif X2_USE_ENDSTOP == _YMIN_
         #define X2_MIN_PIN Y_MIN_PIN
       #elif X2_USE_ENDSTOP == _YMAX_
         #define X2_MIN_PIN Y_MAX_PIN
+      #elif X2_USE_ENDSTOP == _YSTOP_
+        #define X2_MIN_PIN Y_STOP_PIN
       #elif X2_USE_ENDSTOP == _ZMIN_
         #define X2_MIN_PIN Z_MIN_PIN
       #elif X2_USE_ENDSTOP == _ZMAX_
         #define X2_MIN_PIN Z_MAX_PIN
+      #elif X2_USE_ENDSTOP == _ZSTOP_
+        #define X2_MIN_PIN Z_STOP_PIN
       #elif X2_USE_ENDSTOP == _XDIAG_
         #define X2_MIN_PIN X_DIAG_PIN
       #elif X2_USE_ENDSTOP == _YDIAG_
         #define Y2_MAX_ENDSTOP_INVERTING false
       #endif
     #endif
-    #ifndef Y2_MAX_PIN
+    #if !defined(Y2_MAX_PIN) && !defined(Y2_STOP_PIN)
       #if Y2_USE_ENDSTOP == _XMIN_
         #define Y2_MAX_PIN X_MIN_PIN
       #elif Y2_USE_ENDSTOP == _XMAX_
         #define Y2_MAX_PIN X_MAX_PIN
+      #elif Y2_USE_ENDSTOP == _XSTOP_
+        #define Y2_MAX_PIN X_STOP_PIN
       #elif Y2_USE_ENDSTOP == _YMIN_
         #define Y2_MAX_PIN Y_MIN_PIN
       #elif Y2_USE_ENDSTOP == _YMAX_
         #define Y2_MAX_PIN Y_MAX_PIN
+      #elif Y2_USE_ENDSTOP == _YSTOP_
+        #define Y2_MAX_PIN Y_STOP_PIN
       #elif Y2_USE_ENDSTOP == _ZMIN_
         #define Y2_MAX_PIN Z_MIN_PIN
       #elif Y2_USE_ENDSTOP == _ZMAX_
         #define Y2_MAX_PIN Z_MAX_PIN
+      #elif Y2_USE_ENDSTOP == _ZSTOP_
+        #define Y2_MAX_PIN Z_STOP_PIN
       #elif Y2_USE_ENDSTOP == _XDIAG_
         #define Y2_MAX_PIN X_DIAG_PIN
       #elif Y2_USE_ENDSTOP == _YDIAG_
         #define Y2_MIN_ENDSTOP_INVERTING false
       #endif
     #endif
-    #ifndef Y2_MIN_PIN
+    #if !defined(Y2_MIN_PIN) && !defined(Y2_STOP_PIN)
       #if Y2_USE_ENDSTOP == _XMIN_
         #define Y2_MIN_PIN X_MIN_PIN
       #elif Y2_USE_ENDSTOP == _XMAX_
         #define Y2_MIN_PIN X_MAX_PIN
+      #elif Y2_USE_ENDSTOP == _XSTOP_
+        #define Y2_MIN_PIN X_STOP_PIN
       #elif Y2_USE_ENDSTOP == _YMIN_
         #define Y2_MIN_PIN Y_MIN_PIN
       #elif Y2_USE_ENDSTOP == _YMAX_
         #define Y2_MIN_PIN Y_MAX_PIN
+      #elif Y2_USE_ENDSTOP == _YSTOP_
+        #define Y2_MIN_PIN Y_STOP_PIN
       #elif Y2_USE_ENDSTOP == _ZMIN_
         #define Y2_MIN_PIN Z_MIN_PIN
       #elif Y2_USE_ENDSTOP == _ZMAX_
         #define Y2_MIN_PIN Z_MAX_PIN
+      #elif Y2_USE_ENDSTOP == _ZSTOP_
+        #define Y2_MIN_PIN Z_STOP_PIN
       #elif Y2_USE_ENDSTOP == _XDIAG_
         #define Y2_MIN_PIN X_DIAG_PIN
       #elif Y2_USE_ENDSTOP == _YDIAG_
         #define Z2_MAX_ENDSTOP_INVERTING false
       #endif
     #endif
-    #ifndef Z2_MAX_PIN
+    #if !defined(Z2_MAX_PIN) && !defined(Z2_STOP_PIN)
       #if Z2_USE_ENDSTOP == _XMIN_
         #define Z2_MAX_PIN X_MIN_PIN
       #elif Z2_USE_ENDSTOP == _XMAX_
         #define Z2_MAX_PIN X_MAX_PIN
+      #elif Z2_USE_ENDSTOP == _XSTOP_
+        #define Z2_MAX_PIN X_STOP_PIN
       #elif Z2_USE_ENDSTOP == _YMIN_
         #define Z2_MAX_PIN Y_MIN_PIN
       #elif Z2_USE_ENDSTOP == _YMAX_
         #define Z2_MAX_PIN Y_MAX_PIN
+      #elif Z2_USE_ENDSTOP == _YSTOP_
+        #define Z2_MAX_PIN Y_STOP_PIN
       #elif Z2_USE_ENDSTOP == _ZMIN_
         #define Z2_MAX_PIN Z_MIN_PIN
       #elif Z2_USE_ENDSTOP == _ZMAX_
         #define Z2_MAX_PIN Z_MAX_PIN
+      #elif Z2_USE_ENDSTOP == _ZSTOP_
+        #define Z2_MAX_PIN Z_STOP_PIN
       #elif Z2_USE_ENDSTOP == _XDIAG_
         #define Z2_MAX_PIN X_DIAG_PIN
       #elif Z2_USE_ENDSTOP == _YDIAG_
         #define Z2_MIN_PIN X_MIN_PIN
       #elif Z2_USE_ENDSTOP == _XMAX_
         #define Z2_MIN_PIN X_MAX_PIN
+      #elif Z2_USE_ENDSTOP == _XSTOP_
+        #define Z2_MIN_PIN X_STOP_PIN
       #elif Z2_USE_ENDSTOP == _YMIN_
         #define Z2_MIN_PIN Y_MIN_PIN
       #elif Z2_USE_ENDSTOP == _YMAX_
         #define Z2_MIN_PIN Y_MAX_PIN
+      #elif Z2_USE_ENDSTOP == _YSTOP_
+        #define Z2_MIN_PIN Y_STOP_PIN
       #elif Z2_USE_ENDSTOP == _ZMIN_
         #define Z2_MIN_PIN Z_MIN_PIN
       #elif Z2_USE_ENDSTOP == _ZMAX_
         #define Z2_MIN_PIN Z_MAX_PIN
+      #elif Z2_USE_ENDSTOP == _ZSTOP_
+        #define Z2_MIN_PIN Z_STOP_PIN
       #elif Z2_USE_ENDSTOP == _XDIAG_
         #define Z2_MIN_PIN X_DIAG_PIN
       #elif Z2_USE_ENDSTOP == _YDIAG_
           #define Z3_MAX_PIN X_MIN_PIN
         #elif Z3_USE_ENDSTOP == _XMAX_
           #define Z3_MAX_PIN X_MAX_PIN
+        #elif Z3_USE_ENDSTOP == _XSTOP_
+          #define Z3_MAX_PIN X_STOP_PIN
         #elif Z3_USE_ENDSTOP == _YMIN_
           #define Z3_MAX_PIN Y_MIN_PIN
         #elif Z3_USE_ENDSTOP == _YMAX_
           #define Z3_MAX_PIN Y_MAX_PIN
+        #elif Z3_USE_ENDSTOP == _YSTOP_
+          #define Z3_MAX_PIN Y_STOP_PIN
         #elif Z3_USE_ENDSTOP == _ZMIN_
           #define Z3_MAX_PIN Z_MIN_PIN
         #elif Z3_USE_ENDSTOP == _ZMAX_
           #define Z3_MAX_PIN Z_MAX_PIN
+        #elif Z3_USE_ENDSTOP == _ZSTOP_
+          #define Z3_MAX_PIN Z_STOP_PIN
         #elif Z3_USE_ENDSTOP == _XDIAG_
           #define Z3_MAX_PIN X_DIAG_PIN
         #elif Z3_USE_ENDSTOP == _YDIAG_
           #define Z3_MIN_PIN X_MIN_PIN
         #elif Z3_USE_ENDSTOP == _XMAX_
           #define Z3_MIN_PIN X_MAX_PIN
+        #elif Z3_USE_ENDSTOP == _XSTOP_
+          #define Z3_MIN_PIN X_STOP_PIN
         #elif Z3_USE_ENDSTOP == _YMIN_
           #define Z3_MIN_PIN Y_MIN_PIN
         #elif Z3_USE_ENDSTOP == _YMAX_
           #define Z3_MIN_PIN Y_MAX_PIN
+        #elif Z3_USE_ENDSTOP == _YSTOP_
+          #define Z3_MIN_PIN Y_STOP_PIN
         #elif Z3_USE_ENDSTOP == _ZMIN_
           #define Z3_MIN_PIN Z_MIN_PIN
         #elif Z3_USE_ENDSTOP == _ZMAX_
           #define Z3_MIN_PIN Z_MAX_PIN
+        #elif Z3_USE_ENDSTOP == _ZSTOP_
+          #define Z3_MIN_PIN Z_STOP_PIN
         #elif Z3_USE_ENDSTOP == _XDIAG_
           #define Z3_MIN_PIN X_DIAG_PIN
         #elif Z3_USE_ENDSTOP == _YDIAG_
           #define Z4_MAX_PIN X_MIN_PIN
         #elif Z4_USE_ENDSTOP == _XMAX_
           #define Z4_MAX_PIN X_MAX_PIN
+        #elif Z4_USE_ENDSTOP == _XSTOP_
+          #define Z4_MAX_PIN X_STOP_PIN
         #elif Z4_USE_ENDSTOP == _YMIN_
           #define Z4_MAX_PIN Y_MIN_PIN
         #elif Z4_USE_ENDSTOP == _YMAX_
           #define Z4_MAX_PIN Y_MAX_PIN
+        #elif Z4_USE_ENDSTOP == _YSTOP_
+          #define Z4_MAX_PIN Y_STOP_PIN
         #elif Z4_USE_ENDSTOP == _ZMIN_
           #define Z4_MAX_PIN Z_MIN_PIN
         #elif Z4_USE_ENDSTOP == _ZMAX_
           #define Z4_MAX_PIN Z_MAX_PIN
+        #elif Z4_USE_ENDSTOP == _ZSTOP_
+          #define Z4_MAX_PIN Z_STOP_PIN
         #elif Z4_USE_ENDSTOP == _XDIAG_
           #define Z4_MAX_PIN X_DIAG_PIN
         #elif Z4_USE_ENDSTOP == _YDIAG_
           #define Z4_MIN_PIN X_MIN_PIN
         #elif Z4_USE_ENDSTOP == _XMAX_
           #define Z4_MIN_PIN X_MAX_PIN
+        #elif Z4_USE_ENDSTOP == _XSTOP_
+          #define Z4_MIN_PIN X_STOP_PIN
         #elif Z4_USE_ENDSTOP == _YMIN_
           #define Z4_MIN_PIN Y_MIN_PIN
         #elif Z4_USE_ENDSTOP == _YMAX_
           #define Z4_MIN_PIN Y_MAX_PIN
+        #elif Z4_USE_ENDSTOP == _YSTOP_
+          #define Z4_MIN_PIN Y_STOP_PIN
         #elif Z4_USE_ENDSTOP == _ZMIN_
           #define Z4_MIN_PIN Z_MIN_PIN
         #elif Z4_USE_ENDSTOP == _ZMAX_
           #define Z4_MIN_PIN Z_MAX_PIN
+        #elif Z4_USE_ENDSTOP == _ZSTOP_
+          #define Z4_MIN_PIN Z_STOP_PIN
         #elif Z4_USE_ENDSTOP == _XDIAG_
           #define Z4_MIN_PIN X_DIAG_PIN
         #elif Z4_USE_ENDSTOP == _YDIAG_

Marlin/src/inc/Warnings.cpp

     #warning "Auto-assigned X2_DIAG_PIN to X_MIN_PIN."
   #elif X2_USE_ENDSTOP == _XMAX_
     #warning "Auto-assigned X2_DIAG_PIN to X_MAX_PIN."
+  #elif X2_USE_ENDSTOP == _XSTOP_
+    #warning "Auto-assigned X2_DIAG_PIN to X_STOP_PIN."
   #elif X2_USE_ENDSTOP == _YMIN_
     #warning "Auto-assigned X2_DIAG_PIN to Y_MIN_PIN."
   #elif X2_USE_ENDSTOP == _YMAX_
     #warning "Auto-assigned X2_DIAG_PIN to Y_MAX_PIN."
+  #elif X2_USE_ENDSTOP == _YSTOP_
+    #warning "Auto-assigned X2_DIAG_PIN to Y_STOP_PIN."
   #elif X2_USE_ENDSTOP == _ZMIN_
     #warning "Auto-assigned X2_DIAG_PIN to Z_MIN_PIN."
   #elif X2_USE_ENDSTOP == _ZMAX_
     #warning "Auto-assigned X2_DIAG_PIN to Z_MAX_PIN."
+  #elif X2_USE_ENDSTOP == _ZSTOP_
+    #warning "Auto-assigned X2_DIAG_PIN to Z_STOP_PIN."
   #elif X2_USE_ENDSTOP == _XDIAG_
     #warning "Auto-assigned X2_DIAG_PIN to X_DIAG_PIN."
   #elif X2_USE_ENDSTOP == _YDIAG_
     #warning "Auto-assigned Y2_DIAG_PIN to X_MIN_PIN."
   #elif Y2_USE_ENDSTOP == _XMAX_
     #warning "Auto-assigned Y2_DIAG_PIN to X_MAX_PIN."
+  #elif Y2_USE_ENDSTOP == _XSTOP_
+    #warning "Auto-assigned Y2_DIAG_PIN to X_STOP_PIN."
   #elif Y2_USE_ENDSTOP == _YMIN_
     #warning "Auto-assigned Y2_DIAG_PIN to Y_MIN_PIN."
   #elif Y2_USE_ENDSTOP == _YMAX_
     #warning "Auto-assigned Y2_DIAG_PIN to Y_MAX_PIN."
+  #elif Y2_USE_ENDSTOP == _YSTOP_
+    #warning "Auto-assigned Y2_DIAG_PIN to Y_STOP_PIN."
   #elif Y2_USE_ENDSTOP == _ZMIN_
     #warning "Auto-assigned Y2_DIAG_PIN to Z_MIN_PIN."
   #elif Y2_USE_ENDSTOP == _ZMAX_
     #warning "Auto-assigned Y2_DIAG_PIN to Z_MAX_PIN."
+  #elif Y2_USE_ENDSTOP == _ZSTOP_
+    #warning "Auto-assigned Y2_DIAG_PIN to Z_STOP_PIN."
   #elif Y2_USE_ENDSTOP == _XDIAG_
     #warning "Auto-assigned Y2_DIAG_PIN to X_DIAG_PIN."
   #elif Y2_USE_ENDSTOP == _YDIAG_
     #warning "Auto-assigned Z2_DIAG_PIN to X_MIN_PIN."
   #elif Z2_USE_ENDSTOP == _XMAX_
     #warning "Auto-assigned Z2_DIAG_PIN to X_MAX_PIN."
+  #elif Z2_USE_ENDSTOP == _XSTOP_
+    #warning "Auto-assigned Z2_DIAG_PIN to X_STOP_PIN."
   #elif Z2_USE_ENDSTOP == _YMIN_
     #warning "Auto-assigned Z2_DIAG_PIN to Y_MIN_PIN."
   #elif Z2_USE_ENDSTOP == _YMAX_
     #warning "Auto-assigned Z2_DIAG_PIN to Y_MAX_PIN."
+  #elif Z2_USE_ENDSTOP == _YSTOP_
+    #warning "Auto-assigned Z2_DIAG_PIN to Y_STOP_PIN."
   #elif Z2_USE_ENDSTOP == _ZMIN_
     #warning "Auto-assigned Z2_DIAG_PIN to Z_MIN_PIN."
   #elif Z2_USE_ENDSTOP == _ZMAX_
     #warning "Auto-assigned Z2_DIAG_PIN to Z_MAX_PIN."
+  #elif Z2_USE_ENDSTOP == _ZSTOP_
+    #warning "Auto-assigned Z2_DIAG_PIN to Z_STOP_PIN."
   #elif Z2_USE_ENDSTOP == _XDIAG_
     #warning "Auto-assigned Z2_DIAG_PIN to X_DIAG_PIN."
   #elif Z2_USE_ENDSTOP == _YDIAG_
     #warning "Auto-assigned Z3_DIAG_PIN to X_MIN_PIN."
   #elif Z3_USE_ENDSTOP == _XMAX_
     #warning "Auto-assigned Z3_DIAG_PIN to X_MAX_PIN."
+  #elif Z3_USE_ENDSTOP == _XSTOP_
+    #warning "Auto-assigned Z3_DIAG_PIN to X_STOP_PIN."
   #elif Z3_USE_ENDSTOP == _YMIN_
     #warning "Auto-assigned Z3_DIAG_PIN to Y_MIN_PIN."
   #elif Z3_USE_ENDSTOP == _YMAX_
     #warning "Auto-assigned Z3_DIAG_PIN to Y_MAX_PIN."
+  #elif Z3_USE_ENDSTOP == _YSTOP_
+    #warning "Auto-assigned Z3_DIAG_PIN to Y_STOP_PIN."
   #elif Z3_USE_ENDSTOP == _ZMIN_
     #warning "Auto-assigned Z3_DIAG_PIN to Z_MIN_PIN."
   #elif Z3_USE_ENDSTOP == _ZMAX_
     #warning "Auto-assigned Z3_DIAG_PIN to Z_MAX_PIN."
+  #elif Z3_USE_ENDSTOP == _ZSTOP_
+    #warning "Auto-assigned Z3_DIAG_PIN to Z_STOP_PIN."
   #elif Z3_USE_ENDSTOP == _XDIAG_
     #warning "Auto-assigned Z3_DIAG_PIN to X_DIAG_PIN."
   #elif Z3_USE_ENDSTOP == _YDIAG_
     #warning "Auto-assigned Z4_DIAG_PIN to X_MIN_PIN."
   #elif Z4_USE_ENDSTOP == _XMAX_
     #warning "Auto-assigned Z4_DIAG_PIN to X_MAX_PIN."
+  #elif Z4_USE_ENDSTOP == _XSTOP_
+    #warning "Auto-assigned Z4_DIAG_PIN to X_STOP_PIN."
   #elif Z4_USE_ENDSTOP == _YMIN_
     #warning "Auto-assigned Z4_DIAG_PIN to Y_MIN_PIN."
   #elif Z4_USE_ENDSTOP == _YMAX_
     #warning "Auto-assigned Z4_DIAG_PIN to Y_MAX_PIN."
+  #elif Z4_USE_ENDSTOP == _YSTOP_
+    #warning "Auto-assigned Z4_DIAG_PIN to Y_STOP_PIN."
   #elif Z4_USE_ENDSTOP == _ZMIN_
     #warning "Auto-assigned Z4_DIAG_PIN to Z_MIN_PIN."
   #elif Z4_USE_ENDSTOP == _ZMAX_
     #warning "Auto-assigned Z4_DIAG_PIN to Z_MAX_PIN."
+  #elif Z4_USE_ENDSTOP == _ZSTOP_
+    #warning "Auto-assigned Z4_DIAG_PIN to Z_STOP_PIN."
   #elif Z4_USE_ENDSTOP == _XDIAG_
     #warning "Auto-assigned Z4_DIAG_PIN to X_DIAG_PIN."
   #elif Z4_USE_ENDSTOP == _YDIAG_
     #warning "Auto-assigned I_DIAG_PIN to X_MIN_PIN."
   #elif I_USE_ENDSTOP == _XMAX_
     #warning "Auto-assigned I_DIAG_PIN to X_MAX_PIN."
+  #elif I_USE_ENDSTOP == _XSTOP_
+    #warning "Auto-assigned I_DIAG_PIN to X_STOP_PIN."
   #elif I_USE_ENDSTOP == _YMIN_
     #warning "Auto-assigned I_DIAG_PIN to Y_MIN_PIN."
   #elif I_USE_ENDSTOP == _YMAX_
     #warning "Auto-assigned I_DIAG_PIN to Y_MAX_PIN."
+  #elif I_USE_ENDSTOP == _YSTOP_
+    #warning "Auto-assigned I_DIAG_PIN to Y_STOP_PIN."
   #elif I_USE_ENDSTOP == _ZMIN_
     #warning "Auto-assigned I_DIAG_PIN to Z_MIN_PIN."
   #elif I_USE_ENDSTOP == _ZMAX_
     #warning "Auto-assigned I_DIAG_PIN to Z_MAX_PIN."
+  #elif I_USE_ENDSTOP == _ZSTOP_
+    #warning "Auto-assigned I_DIAG_PIN to Z_STOP_PIN."
   #elif I_USE_ENDSTOP == _XDIAG_
     #warning "Auto-assigned I_DIAG_PIN to X_DIAG_PIN."
   #elif I_USE_ENDSTOP == _YDIAG_
     #warning "Auto-assigned J_DIAG_PIN to X_MIN_PIN."
   #elif J_USE_ENDSTOP == _XMAX_
     #warning "Auto-assigned J_DIAG_PIN to X_MAX_PIN."
+  #elif J_USE_ENDSTOP == _XSTOP_
+    #warning "Auto-assigned J_DIAG_PIN to X_STOP_PIN."
   #elif J_USE_ENDSTOP == _YMIN_
     #warning "Auto-assigned J_DIAG_PIN to Y_MIN_PIN."
   #elif J_USE_ENDSTOP == _YMAX_
     #warning "Auto-assigned J_DIAG_PIN to Y_MAX_PIN."
+  #elif J_USE_ENDSTOP == _YSTOP_
+    #warning "Auto-assigned J_DIAG_PIN to Y_STOP_PIN."
   #elif J_USE_ENDSTOP == _ZMIN_
     #warning "Auto-assigned J_DIAG_PIN to Z_MIN_PIN."
   #elif J_USE_ENDSTOP == _ZMAX_
     #warning "Auto-assigned J_DIAG_PIN to Z_MAX_PIN."
+  #elif J_USE_ENDSTOP == _ZSTOP_
+    #warning "Auto-assigned J_DIAG_PIN to Z_STOP_PIN."
   #elif J_USE_ENDSTOP == _XDIAG_
     #warning "Auto-assigned J_DIAG_PIN to X_DIAG_PIN."
   #elif J_USE_ENDSTOP == _YDIAG_
     #warning "Auto-assigned K_DIAG_PIN to X_MIN_PIN."
   #elif K_USE_ENDSTOP == _XMAX_
     #warning "Auto-assigned K_DIAG_PIN to X_MAX_PIN."
+  #elif K_USE_ENDSTOP == _XSTOP_
+    #warning "Auto-assigned K_DIAG_PIN to X_STOP_PIN."
   #elif K_USE_ENDSTOP == _YMIN_
     #warning "Auto-assigned K_DIAG_PIN to Y_MIN_PIN."
   #elif K_USE_ENDSTOP == _YMAX_
     #warning "Auto-assigned K_DIAG_PIN to Y_MAX_PIN."
+  #elif K_USE_ENDSTOP == _YSTOP_
+    #warning "Auto-assigned K_DIAG_PIN to Y_STOP_PIN."
   #elif K_USE_ENDSTOP == _ZMIN_
     #warning "Auto-assigned K_DIAG_PIN to Z_MIN_PIN."
   #elif K_USE_ENDSTOP == _ZMAX_
     #warning "Auto-assigned K_DIAG_PIN to Z_MAX_PIN."
+  #elif K_USE_ENDSTOP == _ZSTOP_
+    #warning "Auto-assigned K_DIAG_PIN to Z_STOP_PIN."
   #elif K_USE_ENDSTOP == _XDIAG_
     #warning "Auto-assigned K_DIAG_PIN to X_DIAG_PIN."
   #elif K_USE_ENDSTOP == _YDIAG_

Marlin/src/pins/pins_postprocess.h

 #else
   #define X_STOP_PIN X_MAX_PIN
 #endif
+#if !defined(X2_USE_ENDSTOP) && ENABLED(X_DUAL_ENDSTOPS) && PIN_EXISTS(X_STOP)
+  #define X2_USE_ENDSTOP _XSTOP_
+#endif
 
 #if HAS_Y_AXIS
   #ifdef Y_STOP_PIN
   #else
     #define Y_STOP_PIN Y_MAX_PIN
   #endif
+  #if !defined(Y2_USE_ENDSTOP) && ENABLED(Y_DUAL_ENDSTOPS) && PIN_EXISTS(Y_STOP)
+    #define Y2_USE_ENDSTOP _YSTOP_
+  #endif
 #endif
 
 #if HAS_Z_AXIS
   #else
     #define Z_STOP_PIN Z_MAX_PIN
   #endif
+  #if ENABLED(Z_MULTI_ENDSTOPS) && PIN_EXISTS(Z_STOP)
+    #ifndef Z2_USE_ENDSTOP
+      #define Z2_USE_ENDSTOP _ZSTOP_
+    #endif
+    #if NUM_Z_STEPPER_DRIVERS >= 3 && !defined(Z3_USE_ENDSTOP)
+      #define Z3_USE_ENDSTOP _ZSTOP_
+    #endif
+    #if NUM_Z_STEPPER_DRIVERS >= 4 && !defined(Z4_USE_ENDSTOP)
+      #define Z4_USE_ENDSTOP _ZSTOP_
+    #endif
+  #endif
 #endif
 
 #if LINEAR_AXES >= 4
     #endif
   #endif
   // Auto-assign pins for stallGuard sensorless homing
-  #if !defined(Z2_DIAG_PIN) && !defined(Z2_USE_ENDSTOP) && defined(Z2_STALL_SENSITIVITY) && ENABLED(Z_MULTI_ENDSTOPS) && NUM_Z_STEPPER_DRIVERS >= 2 && _PEXI(Z2_E_INDEX, DIAG)
+  #if !defined(Z2_DIAG_PIN) && !defined(Z2_USE_ENDSTOP) && defined(Z2_STALL_SENSITIVITY) && ENABLED(Z_MULTI_ENDSTOPS) && _PEXI(Z2_E_INDEX, DIAG)
     #define Z2_DIAG_PIN _EPIN(Z2_E_INDEX, DIAG)
     #if   DIAG_REMAPPED(Z2, X_MIN)
       #define Z2_USE_ENDSTOP _XMIN_
     #endif
   #endif
   // Auto-assign pins for stallGuard sensorless homing
-  #if !defined(Z3_DIAG_PIN) && !defined(Z3_USE_ENDSTOP) && defined(Z3_STALL_SENSITIVITY) && ENABLED(Z_MULTI_ENDSTOPS) && NUM_Z_STEPPER_DRIVERS >= 3 && _PEXI(Z3_E_INDEX, DIAG)
+  #if !defined(Z3_DIAG_PIN) && !defined(Z3_USE_ENDSTOP) && defined(Z3_STALL_SENSITIVITY) && ENABLED(Z_MULTI_ENDSTOPS) && _PEXI(Z3_E_INDEX, DIAG)
     #define Z3_DIAG_PIN _EPIN(Z3_E_INDEX, DIAG)
     #if   DIAG_REMAPPED(Z3, X_MIN)
       #define Z3_USE_ENDSTOP _XMIN_
     #endif
   #endif
   // Auto-assign pins for stallGuard sensorless homing
-  #if !defined(Z4_DIAG_PIN) && !defined(Z4_USE_ENDSTOP) && defined(Z4_STALL_SENSITIVITY) && ENABLED(Z_MULTI_ENDSTOPS) && NUM_Z_STEPPER_DRIVERS >= 4 && _PEXI(Z4_E_INDEX, DIAG)
+  #if !defined(Z4_DIAG_PIN) && !defined(Z4_USE_ENDSTOP) && defined(Z4_STALL_SENSITIVITY) && ENABLED(Z_MULTI_ENDSTOPS) && _PEXI(Z4_E_INDEX, DIAG)
     #define Z4_DIAG_PIN _EPIN(Z4_E_INDEX, DIAG)
     #if   DIAG_REMAPPED(Z4, X_MIN)
       #define Z4_USE_ENDSTOP _XMIN_

Marlin/src/pins/stm32f1/pins_CHITU3D_V9.h

 #define Z2_ENABLE_PIN                       PF3
 #define Z2_STEP_PIN                         PF5
 #define Z2_DIR_PIN                          PF1
+#define Z2_STOP_PIN                         PA13
 
+#ifndef Z_MIN_PROBE_PIN
+  #define Z_MIN_PROBE_PIN                   PG9
+#endif
 #ifndef FIL_RUNOUT2_PIN
   #define FIL_RUNOUT2_PIN                   PF13
 #endif