✨ MKS MINI12864 V3 for MKS Robin Nano V2/3 (#22285)

Marlin/Configuration.h

 //#define MKS_MINI_12864
 
 //
+// MKS MINI12864 V3 is an alias for FYSETC_MINI_12864_2_1. Type A/B. NeoPixel RGB Backlight.
+// 
+//#define MKS_MINI_12864_V3
+
+//
 // MKS LCD12864A/B with graphic controller and SD support. Follows MKS_MINI_12864 pinout.
 // https://www.aliexpress.com/item/33018110072.html
 //

Marlin/src/HAL/STM32F1/inc/SanityCheck.h

   #error "SERIAL_STATS_DROPPED_RX is not supported on the STM32F1 platform."
 #endif
 
-#if ENABLED(NEOPIXEL_LED)
+#if ENABLED(NEOPIXEL_LED) && DISABLED(MKS_MINI_12864_V3)
   #error "NEOPIXEL_LED (Adafruit NeoPixel) is not supported for HAL/STM32F1. Comment out this line to proceed at your own risk!"
 #endif
 

Marlin/src/inc/Conditionals_LCD.h

   #define MKS_MINI_12864
 #endif
 
+// MKS_MINI_12864_V3 is simply identical to FYSETC_MINI_12864_2_1
+#if ENABLED(MKS_MINI_12864_V3)
+  #define FYSETC_MINI_12864_2_1
+#endif
+
 /**
  * General Flags that may be set below by specific LCDs
  *

Marlin/src/inc/Conditionals_post.h

 #elif EITHER(MKS_MINI_12864, ENDER2_STOCKDISPLAY)
   #define _LCD_CONTRAST_MIN  120
   #define _LCD_CONTRAST_INIT 195
+#elif ENABLED(MKS_MINI_12864_V3)
+  #define _LCD_CONTRAST_MIN  255
+  #define _LCD_CONTRAST_INIT 255
+  #define _LCD_CONTRAST_MAX  255
 #elif ENABLED(FYSETC_MINI_12864)
   #define _LCD_CONTRAST_INIT 220
 #elif ENABLED(ULTI_CONTROLLER)

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3_common.h

     #define DOGLCD_SCK                      PB13
     #define DOGLCD_MOSI                     PB15
 
+  #elif ENABLED(MKS_MINI_12864_V3)
+    #define ENABLE_SPI3
+    #define DOGLCD_CS                       PA4
+    #define DOGLCD_A0                       PA5
+    #define LCD_PINS_DC                     DOGLCD_A0
+    #define LCD_BACKLIGHT_PIN               -1
+    #define LCD_RESET_PIN                   PA6
+    #define NEOPIXEL_PIN                    PA7
+    #define DOGLCD_MOSI                     PB15
+    #define DOGLCD_SCK                      PB13
+
   #else
 
     #define LCD_PINS_D4                     PA6

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_V2.h

   #define SDCARD_CONNECTION              ONBOARD
 #endif
 
-#define SDIO_SUPPORT
-#define SDIO_CLOCK                       4500000  // 4.5 MHz
-#define SD_DETECT_PIN                       PD12
-#define ONBOARD_SD_CS_PIN                   PC11
+#if SD_CONNECTION_IS(ONBOARD)
+  #define SDIO_SUPPORT
+  #define SDIO_CLOCK                     4500000  // 4.5 MHz
+  #define SD_DETECT_PIN                     PD12
+  #define ONBOARD_SD_CS_PIN                 PC11
+#elif SD_CONNECTION_IS(LCD)
+  #define ENABLE_SPI1
+  #define SDSS                              PE10
+  #define SD_SCK_PIN                        PA5
+  #define SD_MISO_PIN                       PA6
+  #define SD_MOSI_PIN                       PA7
+  #define SD_DETECT_PIN                     PE12
+#endif
 
 //
 // LCD / Controller
 #endif
 
 #if HAS_WIRED_LCD && !HAS_SPI_TFT
-
-  // NON TFT Displays
+  #define BEEPER_PIN                        PC5
+  #define BTN_ENC                           PE13
+  #define LCD_PINS_ENABLE                   PD13
+  #define LCD_PINS_RS                       PC6
+  #define BTN_EN1                           PE8
+  #define BTN_EN2                           PE11
+  #define LCD_BACKLIGHT_PIN                 -1
 
   #if ENABLED(MKS_MINI_12864)
 
     #ifndef BEEPER_PIN
       #define BEEPER_PIN                    -1
     #endif
+  
+  #elif ENABLED(MKS_MINI_12864_V3)
+    #define DOGLCD_CS                       PD13
+    #define DOGLCD_A0                       PC6
+    #define LCD_PINS_DC                DOGLCD_A0
+    #define LCD_BACKLIGHT_PIN               -1
+    #define LCD_RESET_PIN                   PE14
+    #define NEOPIXEL_PIN                    PE15
+    #define DOGLCD_MOSI                     PA7
+    #define DOGLCD_SCK                      PA5
+    #if SD_CONNECTION_IS(ONBOARD)
+      #define FORCE_SOFT_SPI
+    #endif
 
   #else                                           // !MKS_MINI_12864
 

Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V3.h

 //
 // LCD / Controller
 #define SPI_FLASH
-#define HAS_SPI_FLASH 1
+#define HAS_SPI_FLASH                          1
 #define SPI_DEVICE                             2
 #define SPI_FLASH_SIZE                 0x1000000
 #if ENABLED(SPI_FLASH)
     // Required for MKS_MINI_12864 with this board
     //#define MKS_LCD12864B
     //#undef SHOW_BOOTSCREEN
+  
+  #elif ENABLED(MKS_MINI_12864_V3)
+    #define DOGLCD_CS                       PD13
+    #define DOGLCD_A0                       PC6
+    #define LCD_PINS_DC                DOGLCD_A0
+    #define LCD_BACKLIGHT_PIN               -1
+    #define LCD_RESET_PIN                   PE14
+    #define NEOPIXEL_PIN                    PE15
+    #define DOGLCD_MOSI                     PA7
+    #define DOGLCD_SCK                      PA5
+    #if SD_CONNECTION_IS(ONBOARD)
+      #define FORCE_SOFT_SPI
+    #endif
 
   #else // !MKS_MINI_12864