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kernel: clk-rv1106.c COMPILES CLEAN on 6.18 (M1 first driver ported)

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Full clk port done: Kconfig/Makefile wired, 55 CRU macros, panic_notifier header
split, armclk signature adaptation, CLK_FRAC_DIVIDER_NO_LIMIT->0. clk-rv1106.o
(85KB) builds no-errors with gcc-8.3. Two PORT-VERIFY flags (CPU mux, UART frac
baud) for TRM/hardware validation. First RV1106 driver ported vendor-5.10->6.18.

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
2026-08-23 10:50:24 -06:00
co-authored by Claude Opus 4.8
parent 869fcebe6f
commit 656b463039
2 changed files with 16 additions and 6 deletions
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kernel/rv1106-enablement/PORT-STATUS.md
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@@ -10,8 +10,9 @@ from the **vendor 5.10.160** tree, no plan44 code, built with our
- rv1106's siblings **rv1126/rv1108 exist in both trees**, so their 5.10→6.18 delta is a
working template for the framework API changes.
## M1 — clock driver (`clk-rv1106.c`, 1284 lines): IN PROGRESS
Build-fix loop against 6.18. Fixed so far (captured in `clk/`):
## M1 — clock driver (`clk-rv1106.c`, 1294 lines): ✅ COMPILES CLEAN on 6.18
Build-fix loop against 6.18 — `clk-rv1106.o` (85732 bytes) builds with no errors.
Fixed (captured in `clk/`):
1. **Kconfig + Makefile hooks** — added `CONFIG_CLK_RV1106` (mirrors CLK_RV1126).
2. **CRU register macros** — ported all 55 `RV1106_*` register-accessor `#define`s from the
vendor `clk.h` into 6.18's `clk.h` (mainline has none).
@@ -26,10 +27,12 @@ Build-fix loop against 6.18. Fixed so far (captured in `clk/`):
checked against the RV1106 `CORECLKSEL_CON` register map (TRM) and validated on hardware
before trusting a boot. A wrong mux silently breaks boot.
**Next frontier:** `clk-rv1106.c:427` — `CLK_FRAC_DIVIDER_NO_LIMIT`, a Rockchip
downstream-only fractional-divider flag absent from mainline 6.18; needs mapping to the
mainline frac-divider behavior (likely define-as-0 if mainline defaults to no-limit, but
verify the divider min/max semantics).
5. **`CLK_FRAC_DIVIDER_NO_LIMIT`** — Rockchip downstream-only frac-divider flag (6 uses on
the UART frac clocks); mainline has no min/max opt-out, mapped to 0 (default limit).
**⚠ PORT-VERIFY**: UART fractional baud accuracy.
**Next:** the other core bring-up components (pinctrl, mach/timer, DT, defconfig) — being
surveyed breadth-first in parallel to surface all their deltas before porting.
## Honest scope
This is the first driver of ~120 in the RV1106 BSP. The clk port alone is a multi-cycle