On 10/14/2017 02:19 AM, jeffy wrote: > > > it looks like the suspend sequence depends on the dt node sequence, and > we are putting display-subsystem dt node above spi dt node, so it would > be earlier in the device list, then got suspended later than spi device. > > the pwm backlight and cros_ec_spi pwm are very interesting, not only > about suspend dependency... if we unbind cros_ec_spi pwm, the pwm > backlight would still hold a reference to it, and crash the kernel later. or maybe we should move device_pm_add() from device_add() to driver_bound()?
