Kernel-4.18.0-80.el8_gpio-exar published: 2021-02-19 updated: 2021-02-19 Kernel_4.18.0-80.el8_内核文档 Exportable MPIO interface of Exar UART chips Required properties of the device: exar,first-pin: first exportable pins (0..15) ngpios: number of exportable pins (1..16)