[riot-notifications] [RIOT-OS/RIOT] netdev: add netdev_register_signal (#16922)

José Alamos notifications at github.com
Thu Sep 30 16:36:39 CEST 2021

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### Contribution description
This PR is an alternative to #16921 but more generic (as proposed by @benpicco ).

It adds a callback mechanism to indicate the upper layer that a netdev device finished its setup/registration procedure.

This function can be used as a post_setup hook to do clock configuration or trimming, without requiring to get the private descriptor through the network interface (without this PR the device descriptor is retrieved with gnrc_netif_get_by_type).

This PR is required to remove the GNRC<->netdev dependency, because it won't be guaranteed that the device descriptor of GNRC netif points to a netdev device.

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Compile test should be enough.

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### Issues/PRs references
Alternative to #16921 
Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * <a href="https://github.com/RIOT-OS/RIOT/pull/16922/commits/296dbc5a60b475fa0bf9e4f848d90d9d79e098b1">netdev: add netdev_register_signal</a>

-- File Changes --

    M drivers/include/net/netdev.h (27)

-- Patch Links --


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