Fixes for Z4 axis, CS pins (#17097)

Marlin/src/inc/SanityCheck.h

   #error "An SPI driven TMC driver on Z2 requires Z2_CS_PIN."
 #elif INVALID_TMC_SPI(Z3)
   #error "An SPI driven TMC driver on Z3 requires Z3_CS_PIN."
+#elif INVALID_TMC_SPI(Z4)
+  #error "An SPI driven TMC driver on Z4 requires Z4_CS_PIN."
 #elif INVALID_TMC_SPI(E0)
   #error "An SPI driven TMC driver on E0 requires E0_CS_PIN."
 #elif INVALID_TMC_SPI(E1)
   #error "TMC2208 or TMC2209 on Z2 requires Z2_HARDWARE_SERIAL or Z2_SERIAL_(RX|TX)_PIN."
 #elif INVALID_TMC_UART(Z3)
   #error "TMC2208 or TMC2209 on Z3 requires Z3_HARDWARE_SERIAL or Z3_SERIAL_(RX|TX)_PIN."
+#elif INVALID_TMC_UART(Z4)
+  #error "TMC2208 or TMC2209 on Z4 requires Z4_HARDWARE_SERIAL or Z4_SERIAL_(RX|TX)_PIN."
 #elif INVALID_TMC_UART(E0)
   #error "TMC2208 or TMC2209 on E0 requires E0_HARDWARE_SERIAL or E0_SERIAL_(RX|TX)_PIN."
 #elif INVALID_TMC_UART(E1)
   INVALID_TMC_ADDRESS(Z2);
 #elif AXIS_DRIVER_TYPE_Z3(TMC2209)
   INVALID_TMC_ADDRESS(Z3);
+#elif AXIS_DRIVER_TYPE_Z4(TMC2209)
+  INVALID_TMC_ADDRESS(Z4);
 #elif AXIS_DRIVER_TYPE_E0(TMC2209)
   INVALID_TMC_ADDRESS(E0);
 #elif AXIS_DRIVER_TYPE_E1(TMC2209)
   #error "STEALTHCHOP requires TMC2130, TMC2160, TMC2208, TMC2209, or TMC5160 stepper drivers."
 #endif
 
+/**
+ * TMC SPI Chaining
+ */
 #define IN_CHAIN(A) ((A##_CHAIN_POS > 0) && !HAS_L64XX)
-// TMC SPI Chaining
-#if IN_CHAIN(X) || IN_CHAIN(Y) || IN_CHAIN(Z) || IN_CHAIN(X2) || IN_CHAIN(Y2) || IN_CHAIN(Z2) || IN_CHAIN(Z3) || IN_CHAIN(E0) || IN_CHAIN(E1) || IN_CHAIN(E2) || IN_CHAIN(E3) || IN_CHAIN(E4) || IN_CHAIN(E5)
-  #if  (IN_CHAIN(X)  && !PIN_EXISTS(X_CS) ) || (IN_CHAIN(Y)  && !PIN_EXISTS(Y_CS) ) \
-    || (IN_CHAIN(Z)  && !PIN_EXISTS(Z_CS) ) || (IN_CHAIN(X2) && !PIN_EXISTS(X2_CS)) \
-    || (IN_CHAIN(Y2) && !PIN_EXISTS(Y2_CS)) || (IN_CHAIN(Z2) && !PIN_EXISTS(Z2_CS)) \
-    || (IN_CHAIN(Z3) && !PIN_EXISTS(Z3_CS)) || (IN_CHAIN(E0) && !PIN_EXISTS(E0_CS)) \
-    || (IN_CHAIN(E1) && !PIN_EXISTS(E1_CS)) || (IN_CHAIN(E2) && !PIN_EXISTS(E2_CS)) \
-    || (IN_CHAIN(E3) && !PIN_EXISTS(E3_CS)) || (IN_CHAIN(E4) && !PIN_EXISTS(E4_CS)) \
-    || (IN_CHAIN(E5) && !PIN_EXISTS(E5_CS)) || (IN_CHAIN(E6) && !PIN_EXISTS(E6_CS)) \
-    || (IN_CHAIN(E7) && !PIN_EXISTS(E7_CS))
+#if  IN_CHAIN(X ) || IN_CHAIN(Y ) || IN_CHAIN(Z ) || IN_CHAIN(X2) || IN_CHAIN(Y2) || IN_CHAIN(Z2) || IN_CHAIN(Z3) || IN_CHAIN(Z4) \
+  || IN_CHAIN(E0) || IN_CHAIN(E1) || IN_CHAIN(E2) || IN_CHAIN(E3) || IN_CHAIN(E4) || IN_CHAIN(E5) || IN_CHAIN(E6) || IN_CHAIN(E7)
+  #define BAD_CHAIN(A) (IN_CHAIN(A) && !PIN_EXISTS(A##_CS))
+  #if  BAD_CHAIN(X ) || BAD_CHAIN(Y ) || BAD_CHAIN(Z ) || BAD_CHAIN(X2) || BAD_CHAIN(Y2) || BAD_CHAIN(Z2) || BAD_CHAIN(Z3) || BAD_CHAIN(Z4) \
+    || BAD_CHAIN(E0) || BAD_CHAIN(E1) || BAD_CHAIN(E2) || BAD_CHAIN(E3) || BAD_CHAIN(E4) || BAD_CHAIN(E5) || BAD_CHAIN(E6) || BAD_CHAIN(E7)
     #error "All chained TMC drivers need a CS pin."
   #else
     #if IN_CHAIN(X)
     #elif IN_CHAIN(E7)
       #define CS_COMPARE E7_CS_PIN
     #endif
-    #if  (IN_CHAIN(X)  && X_CS_PIN  != CS_COMPARE) || (IN_CHAIN(Y)  && Y_CS_PIN  != CS_COMPARE) \
-      || (IN_CHAIN(Z)  && Z_CS_PIN  != CS_COMPARE) || (IN_CHAIN(X2) && X2_CS_PIN != CS_COMPARE) \
-      || (IN_CHAIN(Y2) && Y2_CS_PIN != CS_COMPARE) || (IN_CHAIN(Z2) && Z2_CS_PIN != CS_COMPARE) \
-      || (IN_CHAIN(Z3) && Z3_CS_PIN != CS_COMPARE) || (IN_CHAIN(E0) && E0_CS_PIN != CS_COMPARE) \
-      || (IN_CHAIN(E1) && E1_CS_PIN != CS_COMPARE) || (IN_CHAIN(E2) && E2_CS_PIN != CS_COMPARE) \
-      || (IN_CHAIN(E3) && E3_CS_PIN != CS_COMPARE) || (IN_CHAIN(E4) && E4_CS_PIN != CS_COMPARE) \
-      || (IN_CHAIN(E5) && E5_CS_PIN != CS_COMPARE) || (IN_CHAIN(E6) && E6_CS_PIN != CS_COMPARE) \
-      || (IN_CHAIN(E7) && E7_CS_PIN != CS_COMPARE)
+    #define BAD_CS_PIN(A) (IN_CHAIN(A) && A##_CS_PIN != CS_COMPARE)
+    #if  BAD_CS_PIN(X ) || BAD_CS_PIN(Y ) || BAD_CS_PIN(Z ) || BAD_CS_PIN(X2) || BAD_CS_PIN(Y2) || BAD_CS_PIN(Z2) || BAD_CS_PIN(Z3) || BAD_CS_PIN(Z4) \
+      || BAD_CS_PIN(E0) || BAD_CS_PIN(E1) || BAD_CS_PIN(E2) || BAD_CS_PIN(E3) || BAD_CS_PIN(E4) || BAD_CS_PIN(E5) || BAD_CS_PIN(E6) || BAD_CS_PIN(E7)
       #error "All chained TMC drivers must use the same CS pin."
     #endif
+    #undef BAD_CS_PIN
+    #undef CS_COMPARE
   #endif
-  #undef CS_COMPARE
+  #undef BAD_CHAIN
 #endif
 #undef IN_CHAIN
 

Marlin/src/pins/pins.h

 #if !AXIS_HAS_SPI(Z)
   #undef Z_CS_PIN
 #endif
-#if !AXIS_HAS_SPI(E0)
+#if E_STEPPERS && !AXIS_HAS_SPI(E0)
   #undef E0_CS_PIN
 #endif
-#if !AXIS_HAS_SPI(E1)
+#if E_STEPPERS > 1 && !AXIS_HAS_SPI(E1)
   #undef E1_CS_PIN
 #endif
-#if !AXIS_HAS_SPI(E2)
+#if E_STEPPERS > 2 && !AXIS_HAS_SPI(E2)
   #undef E2_CS_PIN
 #endif
-#if !AXIS_HAS_SPI(E3)
+#if E_STEPPERS > 3 && !AXIS_HAS_SPI(E3)
   #undef E3_CS_PIN
 #endif
-#if !AXIS_HAS_SPI(E4)
+#if E_STEPPERS > 4 && !AXIS_HAS_SPI(E4)
   #undef E4_CS_PIN
 #endif
-#if !AXIS_HAS_SPI(E5)
+#if E_STEPPERS > 5 && !AXIS_HAS_SPI(E5)
   #undef E5_CS_PIN
 #endif
-#if !AXIS_HAS_SPI(E6)
+#if E_STEPPERS > 6 && !AXIS_HAS_SPI(E6)
   #undef E6_CS_PIN
 #endif
-#if !AXIS_HAS_SPI(E7)
+#if E_STEPPERS > 7 && !AXIS_HAS_SPI(E7)
   #undef E7_CS_PIN
 #endif