kernel/system: bringup gpio

[greatgitsby]

split from #57

Changes

• TLMM GPIO base is dynamic on mainline (512 vs 0 on downstream), look it up at runtime in gpio.sh, lte.sh, and power_drop_monitor.py
• include pm8998.dtsi/pmi8998.dtsi for PMIC GPIO chips
• enable I2C_QCOM_GENI=y, SENSORS_INA2XX=y, GPIO_SYSFS=y
• add INA231 on i2c10 in DTS
• dynamically discover PM8998 GPIO base, INA231 hwmon and i2c bus
• re-add POWER ALERT pin export (PM8998_GPIO4) in gpio.sh

Testing

Validated on both tizi and mici with tools/test/test_gpio.sh.

tizi - 26/26 PASS

=== GPIO validation on: comma.ai tizi ===

[1] GPIO chip enumeration
  PASS: TLMM chip present (base=552)
  PASS: PM8998 GPIO chip present (base=512)
  PASS: PMI8998 GPIO chip present (base=538)

[2] TLMM pin exports
  PASS: gpio.ready exists
  PASS: all 11 TLMM pins exported with correct offset

[3] Power alert pin
  PASS: gpio515 (PM8998_GPIO4) exported, direction=in, edge=falling

[4] INA231 power monitor
  PASS: INA231 I2C device probed
  PASS: INA231 hwmon present (4896 mV, 157 mA)

[5] power_drop_monitor
  PASS: running (pid 2281, 68s uptime)

[6-8] LTE, USB hub, kernel health
  PASS: all checks passed

PASS: 26  FAIL: 0 - ALL TESTS PASSED

mici - 22/22 PASS

=== GPIO validation on: comma.ai mici ===

[1] GPIO chip enumeration
  PASS: TLMM chip present (base=552)
  PASS: PM8998 GPIO chip present (base=512)
  PASS: PMI8998 GPIO chip present (base=538)

[2] TLMM pin exports
  PASS: gpio.ready exists
  PASS: all 11 TLMM pins exported with correct offset

[3] Power alert pin
  PASS: gpio515 (PM8998_GPIO4) exported, direction=in, edge=falling

[4] INA231 power monitor
  PASS: INA231 I2C device probed
  WARN: INA231 hwmon not present (chip not responding)

[5] power_drop_monitor
  WARN: skipped (INA231 not available)

[6-8] LTE, USB hub, kernel health
  PASS: all checks passed

PASS: 22  FAIL: 0 - ALL TESTS PASSED

Notes

• mici does not have an INA231 - the WARN is expected and matches old kernel behavior (also fails with ETIMEDOUT on downstream 4.9)
• GPIO 1264 on downstream = PM8998_GPIO4 (base 1261 + offset 3). On mainline PM8998 base is 512, so it becomes gpio515
• tizi pin 41 (PANDA_1V8_EN_N) is exported on tizi but skipped on tici (SSD_3v3 EN)

[github-actions]

vamOS System Profile

Changes vs master

Metric	Change
Used space	3442.3MB → 3442.4MB (+0MB)
Sparse image	3381.0MB → 3381.4MB (+.3MB)
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Directory size changes (>1MB)

Directory	Change

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/usr/comma/updater	23.5MB
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/usr/comma/reset	23.5MB
/usr/local/uv/python/cpython-3.12.13-linux-aarch64-gnu/bin/python3.12	21.6MB