On Thu, May 23, 2019 at 06:01:16PM -0700, Saravana Kannan wrote: > This sync_state driver/bus callback is called once all the consumers > of a supplier have probed successfully. > > This allows the supplier device's driver/bus to sync the supplier > device's state to the software state with the guarantee that all the > consumers are actively managing the resources provided by the supplier > device. > > To maintain backwards compatibility and ease transition from existing > frameworks and resource cleanup schemes, late_initcall_sync is the > earliest when the sync_state callback might be called. > > There is no upper bound on the time by which the sync_state callback > has to be called. This is because if a consumer device never probes, > the supplier has to maintain its resources in the state left by the > bootloader. For example, if the bootloader leaves the display > backlight at a fixed voltage and the backlight driver is never probed, > you don't want the backlight to ever be turned off after boot up. > > Signed-off-by: Saravana Kannan <saravanak@xxxxxxxxxx> > --- > drivers/base/core.c | 39 +++++++++++++++++++++++++++++++++++++++ > drivers/of/platform.c | 9 +++++++++ > include/linux/device.h | 19 +++++++++++++++++++ > 3 files changed, 67 insertions(+) Also: Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> thanks, greg k-h
