automation/eclair: add deviation for MISRA C:2012 Rule 16.6

Update ECLAIR configuration to take into account the deviations
agreed during MISRA meetings.

Signed-off-by: Federico Serafini <federico.serafini@bugseng.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

automation/eclair_analysis/ECLAIR/deviations.ecl

@@ -378,6 +378,10 @@ explicit comment indicating the fallthrough intention is present."
 -config=MC3R1.R16.3,reports+={safe, "any_area(end_loc(any_exp(text(^(?s).*/\\* [fF]all ?through.? \\*/.*$,0..1))))"}
 -doc_end
 
+-doc_begin="A switch statement with a single switch clause and no default label may be used in place of an equivalent if statement if it is considered to improve readability."
+-config=MC3R1.R16.6,switch_clauses+={deliberate, "default(0)"}
+-doc_end
+
 #
 # Series 18.
 #

docs/misra/deviations.rst

@@ -322,6 +322,12 @@ Deviations related to MISRA C:2012 Rules:
          - /\* Fallthrough \*/
          - /\* Fallthrough. \*/
 
+   * - R16.6
+     - A switch statement with a single switch clause and no default label may
+       be used in place of an equivalent if statement if it is considered to
+       improve readability.
+     - Tagged as `deliberate` for ECLAIR.
+
    * - R20.7
      - Code violating Rule 20.7 is safe when macro parameters are used:
        (1) as function arguments;