参考链接

https://www.360doc.cn/article/71858349_1119199262.html

修改驱动drivers/mfd/rk808.c

static void rk817_shutdown_prepare(void)                                  
{                                                                         int ret;                                                              struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);           /* close int when power off */                                        regmap_update_bits(rk808->regmap,                                     RK817_INT_STS_MSK_REG0,                                    
-              0xff, 0xff);  
+              0xff, 0x9f);                                                               regmap_update_bits(rk808->regmap,                                     RK817_INT_STS_MSK_REG1,                                    0xff, 0xff);                                               regmap_update_bits(rk808->regmap,                                     RK817_INT_STS_MSK_REG2,                                    0xff, 0xff);                                               regmap_update_bits(rk808->regmap,                                     RK817_RTC_INT_REG,                                         
-              (0x3 << 2), (0x0 << 2));       
+              (0x3 << 2), (0x3 << 2));  

测试验证

echo +60 > /sys/class/rtc/rtc0/wakealarm 去设置60秒后开机
然后echo freeze > /sys/power/state等待开机
RTC唤醒时间是从执行echo +60 > /sys/class/rtc/rtc0/wakealarm 起算