soc: riscv: openisa: rv32m1: add pinctrl support

[henrikbrixandersen]

• Add pinctrl support to the OpenISA RV32M1 SoC
• Add pinctrl support to the OpenISA RV32M1 peripheral drivers (lpuart, lpi2c, lpspi, tpm)
• Convert the OpenISA VEGAboard from pinmux to pinctrl

[henrikbrixandersen]

Note: As I do not have access to a machine parseable list of the allowed pin MUX settings, I have left out the otherwise recommended vnd-soc-pkgxx.h header file (see https://docs.zephyrproject.org/latest/hardware/pinctrl/index.html).

[gmarull]

lgtm, a few minor comments

[henrikbrixandersen]

so shouldn't it be made optional? seems though that in many cases slow could be preferred, and with a default people will forget about it :-)

Exactly why I am not making it optional. The hardware default is "fast", but likely many pins should be configured for "slow". I do not like putting in a DTS default that does not match the hardware default. By making this property required, users are required to consider if the slew rate should be "fast" or "slow".

This is equivalent to the NXP Kinetis pinctrl binding, by the way, on which this is based:

zephyr/dts/bindings/pinctrl/nxp,kinetis-pinctrl.yaml

Line 65 in 3122a2c

slew-rate:

The two IPs are very alike.

[codecov-commenter]

Codecov Report

Merging #45274 (3122a2c) into main (005968a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 3122a2c differs from pull request most recent head 05ccb61. Consider uploading reports for the commit 05ccb61 to get more accurate results

@@           Coverage Diff           @@
##             main   #45274   +/-   ##
=======================================
  Coverage   49.86%   49.86%           
=======================================
  Files         643      643           
  Lines       80617    80626    +9     
  Branches    18933    18933           
=======================================
+ Hits        40197    40206    +9     
  Misses      33757    33757           
  Partials     6663     6663           

Impacted Files	Coverage Δ
kernel/sched.c	88.71% <100.00%> (+0.16%)	⬆️
kernel/work.c	87.67% <100.00%> (ø)
include/zephyr/sys/time_units.h	97.51% <0.00%> (-0.50%)	⬇️
subsys/testsuite/ztest/src/ztress.c	88.09% <0.00%> (-0.48%)	⬇️
boards/posix/native_posix/timer_model.c	52.17% <0.00%> (+0.72%)	⬆️
drivers/timer/hpet.c	87.75% <0.00%> (+1.02%)	⬆️

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