CONFIG_OF_GPIO_MM_GPIOCHIP (not configurable)

configname: CONFIG_OF_GPIO_MM_GPIOCHIP

Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>OF_GPIO_MM_GPIOCHIP
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
This adds support for the legacy 'struct of_mm_gpio_chip' interface
from PowerPC. Existing drivers using this interface need to select
this symbol, but new drivers should use the generic gpio-regmap
infrastructure instead.