[riot-notifications] [RIOT-OS/RIOT] sys/saul: add saul_reg_find_type_and_name (#15791)

Bas Stottelaar notifications at github.com
Mon Jan 18 22:38:48 CET 2021

### Contribution description
This PR adds `saul_reg_find_type_and_name(type, name)`.

The existing `saul_reg_find_type(type)` and `saul_reg_find_name(name)` will only return the first registration found. Given that there can be multiple sensors/actuators of the same type and sensors/actuators register with the same name, the existing methods are not useful to find (for instance) a specific sensor or actuator.

The user could write its own method to find a registration, since `saul_reg` is exported as a global, but I think having this method as well won't hurt.

### Testing procedure
Unit tests have been provided.

### Issues/PRs references

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-- Commit Summary --

  * sys/saul_reg: add saul_reg_find_type_and_name
  * unittests: extend tests for saul_reg

-- File Changes --

    M sys/include/saul_reg.h (19)
    M sys/saul_reg/saul_reg.c (13)
    M tests/unittests/tests-saul_reg/tests-saul_reg.c (40)

-- Patch Links --


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