🔧 Fix USE_Z_MIN conditions (MarlinFirmware#26762)

Author: The-EG

Marlin/src/inc/Conditionals_post.h

@@ -1957,8 +1957,9 @@
  *   Currently this must be distinct, but we can add a mechanism to use the same pin for sensorless
  *   or switches wired to the same pin, or for the single SPI stall state on the axis.
  */
-#define _USE_STOP(A,N,M,C) ((ANY(A##_HOME_TO_##M, A##N##_SAFETY_STOP) || (C+0)) && PIN_EXISTS(A##N##_##M) && !A##_SPI_SENSORLESS)
-#define _HAS_STATE(A,N,M) (USE_##A##N##_##M || (ANY(A##_HOME_TO_##M, A##N##_SAFETY_STOP) && A##_SPI_SENSORLESS))
+#define _ANY_STOP(A,N,M) ANY(A##_HOME_TO_##M, A##N##_SAFETY_STOP)
+#define _USE_STOP(A,N,M,C) ((_ANY_STOP(A,N,M) || (C+0)) && PIN_EXISTS(A##N##_##M) && !A##_SPI_SENSORLESS)
+#define _HAS_STATE(A,N,M) (USE_##A##N##_##M || (_ANY_STOP(A,N,M) && A##_SPI_SENSORLESS))
 
 #if _USE_STOP(X,,MIN,)
   #define USE_X_MIN 1
@@ -1992,7 +1993,7 @@
   #define HAS_Y_STATE 1
 #endif
 
-#if _USE_STOP(Z,,MIN,ENABLED(Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN))
+#if _USE_STOP(Z,,MIN,ENABLED(Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN)) && (DISABLED(USE_PROBE_FOR_Z_HOMING) || ENABLED(Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN))
   #define USE_Z_MIN 1
 #endif
 #if _USE_STOP(Z,,MAX,)
@@ -2199,7 +2200,9 @@
   #define HAS_Z_PROBE_STATE 1
 #endif
 
+#undef _ANY_STOP
 #undef _USE_STOP
+#undef _HAS_STATE
 
 /**
  * Set ENDSTOPPULLUPS for active endstop switches

Marlin/src/inc/SanityCheck.h

@@ -2384,8 +2384,8 @@ static_assert(NUM_SERVOS <= NUM_SERVO_PLUGS, "NUM_SERVOS (or some servo index) i
     #error "Y_MIN_PIN, Y_STOP_PIN, or Y_SPI_SENSORLESS is required for Y axis homing."
   #elif Y_HOME_TO_MAX && !HAS_Y_MAX_STATE
     #error "Y_MAX_PIN, Y_STOP_PIN, or Y_SPI_SENSORLESS is required for Y axis homing."
-  #elif Z_HOME_TO_MIN && !HAS_Z_MIN_STATE
-    #error "Z_MIN_PIN, Z_STOP_PIN, or Z_SPI_SENSORLESS is required for Z axis homing."
+  #elif Z_HOME_TO_MIN && NONE(HAS_Z_MIN_STATE, USE_PROBE_FOR_Z_HOMING)
+    #error "Z_MIN_PIN, Z_STOP_PIN, Z_SPI_SENSORLESS, or USE_PROBE_FOR_Z_HOMING is required for Z axis homing."
   #elif Z_HOME_TO_MAX && !HAS_Z_MAX_STATE
     #error "Z_MAX_PIN, Z_STOP_PIN, or Z_SPI_SENSORLESS is required for Z axis homing."
   #elif I_HOME_TO_MIN && !HAS_I_MIN_STATE