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BFE EngineeringandClaude Opus 4.8 869fcebe6f kernel: start RV1106 -> Linux 6.18 forward-port (self-built, from vendor 5.10)

Per [maintainer]: forward-port the RV1106 SoC enablement from the vendor 5.10 tree to
6.18 LTS ourselves (no plan44), on our Buildroot. Verified mainline has ZERO
RV1106 support, so this is a whole-BSP port. docs/bringup.md = the console-first
milestone plan + method (sibling-delta from rv1126/rv1108, which exist in both
trees). M1 (clk driver) underway: gcc-8.3 builds 6.18; wired CLK_RV1106; ported
55 CRU macros + the panic_notifier header split + the armclk signature change
(flagged PORT-VERIFY for the CPU-mux, TRM-check needed). Captured in
rv1106-enablement/. Honest: first of ~120 files; multi-month effort.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017wB8KB3MMQztRDXCMCkPrf

2026-08-23 10:32:33 -06:00

2.9 KiB

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RV1106 → 6.18 forward-port — live status

Target: Linux 6.18.46 (vanilla, flare-edge/research/linux-6.18.46/), forward-ported from the vendor 5.10.160 tree, no plan44 code, built with our arm-rockchip830-...-gcc 8.3 (confirmed: gcc 8.3 builds 6.18 fine).

Confirmed feasibility facts

gcc 8.3 (our SDK toolchain) compiles the 6.18 kernel — no toolchain bump needed to start.
multi_v7_defconfig (ARM + rockchip) configures; CLK_RV1106=y wires in cleanly.
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/):

Kconfig + Makefile hooks — added CONFIG_CLK_RV1106 (mirrors CLK_RV1126).
CRU register macros — ported all 55 RV1106_* register-accessor #defines from the vendor clk.h into 6.18's clk.h (mainline has none).
Header split — panic_notifier_list moved to <linux/panic_notifier.h> (kernel 5.18); added the include.
rockchip_clk_register_armclk signature change — 5.10 took (num_parents, parent_clk, alt_parent_clk); 6.18 takes (parent_names[], num_parents) and drives the mux from reg_data.mux_core_main/alt. Adapted the call to the 6.18 form using a parent-names array (sibling-delta from rv1126). ⚠ PORT-VERIFY: the mux input list { "gpll","cpll","apll" } and the mux_core_main/alt=2 mapping are a best-effort from the 5.10 intent (main=apll) — they set the CPU clock source, so they must be 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).

Honest scope

This is the first driver of ~120 in the RV1106 BSP. The clk port alone is a multi-cycle effort of the four delta classes above; the whole bring-up (M1–M6 in ../docs/bringup.md) is a multi-month kernel effort. Progress is real and the method is proven; correctness of boot-critical pieces (clock mux, PLL rates, DDR, pinctrl iomux) requires the TRM and on-hardware validation — which waits on c8a3's recovery and, ultimately, careful bring-up.

Layout

clk/
  clk-rv1106.c                         the ported driver (WIP, compiles to :427)
  rv1106-cru.h                         the clock-id dt-bindings header (staged)
  0001-rv1106-clk-framework-hooks.wip.patch   Makefile/Kconfig/clk.h deltas vs vanilla 6.18

The full ported tree lives in flare-edge/research/linux-6.18.46/ (scratch); this dir is the durable, reviewable capture, to become a proper patch series as milestones land.

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