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kernel/rv1106: PVTM VERIFIED — both monitors probe + read (7th driver)

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Whole-driver port (mainline has no rockchip pvtm): copied vendor rockchip_pvtm.c
+ pvtm.h. 6.18 deltas: thermal_zone opaque -> thermal_zone_get_temp; of_device.h.
Real blocker: vendor of_match_table wrapped rv1106 entries in #ifdef
CONFIG_CPU_RV1106 (nonexistent in mainline) -> devices+driver present but never
bound, probe silent. Dropped the guard -> both bind.

Verified: ff240000.pvtm + ff390000.pvtm probed; /sys/kernel/debug/pvtm/{core,pmu}/
value read ring-osc counts (71682 90462 / 35772). pvtm/PORT-DONE.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017wB8KB3MMQztRDXCMCkPrf
This commit is contained in:
BFE Engineering
2026-08-25 07:25:49 -06:00
co-authored by Claude Opus 4.8
parent aa25577095
commit 54f961c6b6
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kernel/rv1106-enablement/pvtm/PORT-DONE.md
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# PVTM (Process-Voltage-Temperature Monitor) — ✅ VERIFIED on warden-c8a3 (2026-08-25)
Whole-driver port: mainline 6.18 has **no** rockchip pvtm driver; the vendor
`drivers/soc/rockchip/rockchip_pvtm.c` (GPL-2.0, 1046L) supports rv1106. Copied it in
+ `include/linux/soc/rockchip/pvtm.h`; Kconfig `ROCKCHIP_PVTM` + Makefile; `=y`.
## API-delta fixes (6.18)
- `struct thermal_zone_device` is now opaque → replaced `pvtm->tz->ops->get_temp(...)`
with the public `thermal_zone_get_temp(pvtm->tz, &cur_temp)`.
- added `#include <linux/of_device.h>` for `of_match_device()`.
- copied the vendor-only header `linux/soc/rockchip/pvtm.h`.
## The real blocker (why it first probed silently)
The vendor of_match_table wraps the rv1106 entries in `#ifdef CONFIG_CPU_RV1106` — a
vendor per-SoC symbol that does **not exist** in mainline. Result: devices
(`ff240000.pvtm`, `ff390000.pvtm`) were created + the driver registered, but the
compatibles were compiled out of the match table, so nothing bound and probe never
ran (no dmesg at all). **Fix: drop the `#ifdef CONFIG_CPU_RV1106` guard** — our tree
only builds for rv1106, so the entries are unconditional. (Watch for this guard in any
other vendor driver ported by verbatim copy.)
## Evidence
`rockchip-pvtm ff240000.pvtm: pvtm@0 probed` + `ff390000.pvtm: pvtm@0 probed`;
`/sys/kernel/debug/pvtm/core/value = pvtm: 71682 90462`,
`/sys/kernel/debug/pvtm/pmu/value = pvtm: 35772` (ring-oscillator counts, the PVT
signal). Exports `rockchip_get_pvtm_value()` for future DVFS voltage margining.