reset: allow drivers to request probe deferral
If the requested reset controller is not yet available, have reset_control_get and device_reset return -EPROBE_DEFER so the driver can decide to request probe deferral. Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de> Acked-by: NShawn Guo <shawn.guo@linaro.org> Reviewed-by: NStephen Warren <swarren@nvidia.com>
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