SDPOWER => SDPOWER_PIN

Marlin/src/inc/SanityCheck.h

   #error "POWER_SUPPLY is now obsolete. Please remove it from Configuration.h."
 #elif defined(MKS_ROBIN_TFT)
   #error "MKS_ROBIN_TFT is now FSMC_GRAPHICAL_TFT. Please update your configuration."
+#elif defined(SDPOWER)
+  #error "SDPOWER is now SDPOWER_PIN. Please update your configuration and/or pins."
 #endif
 
 #define BOARD_MKS_13        -1109

Marlin/src/pins/mega/pins_CHEAPTRONICv2.h

 #define BEEPER_PIN         44
 
 #if ENABLED(SDSUPPORT)
-  #define SDPOWER          -1
   #define SDSS             53
   #define SD_DETECT_PIN    49
 #endif

Marlin/src/pins/mega/pins_GT2560_REV_A.h

 //
 // Misc. Functions
 //
-#define SDPOWER            -1
 #define SDSS               53
 #define LED_PIN            13
 #define PS_ON_PIN          12

Marlin/src/pins/mega/pins_WANHAO_ONEPLUS.h

 // SD Card
 //
 #define SD_DETECT_PIN      -1
-#define SDPOWER            -1
 #define SDSS               53
 
 //

Marlin/src/pins/pins.h

 #ifndef SD_DETECT_PIN
   #define SD_DETECT_PIN -1
 #endif
-#ifndef SDPOWER
-  #define SDPOWER -1
+#ifndef SDPOWER_PIN
+  #define SDPOWER_PIN -1
 #endif
 #ifndef SDSS
   #define SDSS -1

Marlin/src/pins/pinsDebug_list.h

 // #if defined(SDA) && SDA >= 0
 //   REPORT_NAME_DIGITAL(__LINE__, SDA)
 // #endif
-#if defined(SDPOWER) && SDPOWER >= 0
-  REPORT_NAME_DIGITAL(__LINE__, SDPOWER)
+#if PIN_EXISTS(SDPOWER)
+  REPORT_NAME_DIGITAL(__LINE__, SDPOWER_PIN)
 #endif
 #if defined(SDSS) && SDSS >= 0
   REPORT_NAME_DIGITAL(__LINE__, SDSS)

Marlin/src/pins/ramps/pins_FELIX2.h

 //
 // Misc. Functions
 //
-#undef SDPOWER
-#define SDPOWER             1
+#define SDPOWER_PIN         1
 
 #define PS_ON_PIN          12
 

Marlin/src/pins/ramps/pins_RAMPS_OLD.h

 //
 // Misc. Functions
 //
-#define SDPOWER            48
+#define SDPOWER_PIN        48
 #define SDSS               53
 #define LED_PIN            13
 #define CASE_LIGHT_PIN     45   // Hardware PWM

Marlin/src/pins/ramps/pins_RUMBA.h

 #define BEEPER_PIN         44
 
 #if ENABLED(SDSUPPORT)
-  #define SDPOWER          -1
   #define SDSS             53
   #define SD_DETECT_PIN    49
 #endif

Marlin/src/pins/stm32/pins_BEAST.h

 //
 // Misc. Functions
 //
-#define SDPOWER            -1
 #define SDSS               PA15
 #define LED_PIN            PB2
 

Marlin/src/pins/stm32/pins_CHITU3D.h

 //
 // Misc. Functions
 //
-#define SDPOWER            -1
 #define SDSS               -1
 #define LED_PIN            -1
 #define CASE_LIGHT_PIN      8

Marlin/src/sd/cardreader.cpp

   // Disable autostart until card is initialized
   autostart_index = -1;
 
-  //power to SD reader
-  #if SDPOWER > -1
-    OUT_WRITE(SDPOWER, HIGH);
+  #if PIN_EXISTS(SDPOWER)
+    OUT_WRITE(SDPOWER_PIN, HIGH); // Power the SD reader
   #endif
 }