jedec_ts: a driver for temperature sensors on memory modules

[avg]

Summary

The driver currently supports chips that are fully compliant with the
JEDEC SPD / EEPROM / TS standard (JEDEC Standard 21-C,
TSE2002 Specification, frequenlty referred to as JEDEC JC 42.4).

Additionally some chips from STMicroelectronics are supported as well.
They are compliant except for their Device ID pattern.

Test Plan

Tested on hardware that I have access to:
KVR16E11S8/4 memory modules with STTS424E02 chip (compines a temperature
sensor and an SPD EEPROM).
Example:
dev.jedec_ts.0.temp: 39.2500C

[imp]

sys/dev/jedec_ts/jedec_ts.c

103 ↗

(On Diff #21137)

It would be safer to put all this in the attach routine.
Most of the I2C drivers just assume the probe is good.
There are a few that write to the chip during the probe.

[avg]

sys/dev/jedec_ts/jedec_ts.c

103 ↗

(On Diff #21137)

Is this to avoid fiddling with the hardware in case that a more specific driver wins the device during probing?
I'll make the change.

[avg]

jedec_ts: move hardware probing to the attach routine

This is done, so that another, more specific driver could claim
the device before this driver has a chance to mess up the hardware.

[avg]

• actually allow to be compiled into the kernel
• add to NOTES / LINT
• some clean-ups in the manual page

[wblock]

share/man/man4/jedec_ts.4

79 ↗

(On Diff #21342)

Not sure if .Va should be included in the parameter as it is invisible, but at worst it just gives an extra three spaces of indent.

85 ↗

(On Diff #21342)

Needs a comma:

.Xr device.hints 5 ,

99 ↗

(On Diff #21342)

Generally, numbers less than ten should be spelled out.

100 ↗

(On Diff #21342)

As above, s/8/eight/.

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man page fixes suggested by wblock

[wblock]

Man page looks good, but please test with mandoc -Tlint and igor -Rbefore commit. Thanks!

[avg]

add jedec_ts to modules/i2c/Makefile

[avg]

If there are no objections or requests for changes, I would like to commit this driver sooner rather than later.