On Sat, Oct 14, 2017 at 02:25:48AM +0800, jeffy wrote: > 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()? You do not necessarily need to have a driver to power the dveice on and off. -- Dmitry
