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pinctrl: sh-pfc: Validate pinmux tables at runtime when debugging
Perform some basic sanity checks on all built-in pinmux tables when
DEBUG is defined, to help catching bugs early.
For now the following checks are included:
- Check register and field widths in descriptors for config registers
with variable-width fields,
- Check relations between pin groups and functions:
- All pin functions must refer to existing pin groups,
- All pin groups must be referred to by a pin function,
- Warn if a pin group is referred to by multiple pin functions
(which is OK for backwards-compatibility aliases),
- Provide suggestions for reducing table sizes: reserved fields of
more than 3 bits can better be split in smaller subfields, as the
storage need is proportional to the square of the width of the
(sub)field,
Note that a dummy non-matching entry is added to the DT match table for
checking r8a7795es1_pinmux_info, as R-Car H3 ES1.0 is matched using
soc_device_match() in r8a7795_pinmux_init(), instead of by the DT match
table.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>