description: > Backlight for an SH8601 AMOLED panel. The panel has no dedicated backlight pin: brightness is controlled over the panel's own QSPI command interface (command 0x51), so this driver sends that command through the parent display device's panel IO. Must be declared as a child node of the display device it dims. compatible: "sh8601-backlight" properties: brightness-default: type: int default: 255 description: Default brightness level (0-255), applied by set_brightness_default()