展讯物理按键配置经验

展讯系统驱动配置物理按键，首先查看硬件原理图，找到对应物理按键的管脚，比如按键5接的是gpio125

1.打开kernel/arch/arm/boot/dts/对应项目的.dts文件
修改gpio_keys下的配置，gpios修改对应的gpio引脚号

gpio_keys {
 		key_5 {
 			label = "5 Key";
			linux,code = <6>;
-			gpios = <&ap_gpio 92 1>;
+			gpios = <&ap_gpio 125 1>;
 			gpio-key,wakeup;
			gpio-key,level-trigger;
 		};

}

linux,code对应的就是KEY CODE
gpio-key,wakeup代表按下时如果系统正在休眠会触发唤醒
gpio-key,level-trigger 表示增加电平触发判断

2.打开u-boot15/board/spreadtrum/对应项目的pinmap .c文件

对照平台GPIO_Spec的xls表，找到gpio125对应的Ball Name，修改Fuction为默认gpio功能:BITS_PIN_AF(3)

1 2	`{REG_PIN_RTCK_LTE, BITS_PIN_AF(3)}, {REG_MISC_PIN_RTCK_LTE, BITS_PIN_DS(1)\|BIT_PIN_NULL\|BIT_PIN_NUL\|BIT_PIN_SLP_AP\|BIT_PIN_SLP_NUL\|BIT_PIN_SLP_OE},`

2020-06-10

Linux cgroups机制 cpu/cpuset/schedtune

Linux / System

展讯物理按键配置经验

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