* [PATCH AUTOSEL 6.18-6.1] clk: samsung: exynos850: mark APM I3C clocks as critical
[not found] <20260831133314.4125787-1-sashal@kernel.org>
@ 2026-08-31 13:23 ` Sasha Levin
2026-08-31 13:29 ` [PATCH AUTOSEL 6.18] clk: samsung: exynos990: Fix PERIC0/1 USI clock types Sasha Levin
1 sibling, 0 replies; 2+ messages in thread
From: Sasha Levin @ 2026-08-31 13:23 UTC (permalink / raw)
To: patches, stable
Cc: Alexey Klimov, Sam Protsenko, Tudor Ambarus, Krzysztof Kozlowski,
Sasha Levin, s.nawrocki, cw00.choi, peter.griffin, sboyd,
bmasney+clk, jbrunet+clk, linux-arm-kernel, linux-samsung-soc,
linux-clk, linux-kernel
From: Alexey Klimov <alexey.klimov@linaro.org>
[ Upstream commit 44984aaf1aa727ff944dd4b72fcf069d08b0056d ]
The Exynos850 APM co-processor relies on the I3C bus to communicate with
the PMIC. Currently, there is no dedicated PMIC consumer driver managing
these clocks, so the clock subsystem automatically gates them during the
initialisation. Once gated, any subsequent ACPM communication with APM
results in timeouts.
As a temporary workaround (and let's hope it doesn't become permanent),
mark both `gout_i3c_pclk` and `gout_i3c_sclk` as CLK_IS_CRITICAL ones to
prevent the clock subsystem from disabling them. This makes the ACPM
communication functional. This workaround should be reverted once a
proper ACPM PMIC driver is implemented to manage these clocks.
Cc: Sam Protsenko <semen.protsenko@linaro.org>
Cc: Tudor Ambarus <tudor.ambarus@linaro.org>
Signed-off-by: Alexey Klimov <alexey.klimov@linaro.org>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Link: https://patch.msgid.link/20260430-exynos850-i3c-criticalclocks-v1-1-6e1fd8dfa21b@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
LLM Generated explanations, may be completely bogus:
## Phase 1: Commit Message Forensics
### Step 1.1: Subject Line
**Record:** `[clk: samsung: exynos850]` `[mark]` — Mark APM I3C clocks
(`gout_i3c_pclk`, `gout_i3c_sclk`) as `CLK_IS_CRITICAL` to prevent the
clock core from gating them.
### Step 1.2: Commit Message Tags
**Record:**
- **Fixes:** — not present (expected for manual review)
- **Reported-by:** — none
- **Tested-by:** — none
- **Reviewed-by:** Sam Protsenko \<semen.protsenko@linaro.org\>, Tudor
Ambarus \<tudor.ambarus@linaro.org\>
- **Acked-by:** — none
- **Cc:** Sam Protsenko, Tudor Ambarus (not stable@vger.kernel.org)
- **Link:** https://patch.msgid.link/20260430-exynos850-i3c-
criticalclocks-v1-1-6e1fd8dfa21b@linaro.org
- **Signed-off-by:** Alexey Klimov, Krzysztof Kozlowski (ignore
pipeline-added SOBs)
Notable: two Reviewed-by tags from Linaro Exynos850 platform developers;
no syzbot or user bug reports.
### Step 1.3: Commit Body Analysis
**Record:**
- **Bug:** With no PMIC consumer driver holding references, the clock
framework gates `gout_i3c_pclk` and `gout_i3c_sclk` during init.
- **Symptom:** After gating, all ACPM communication with the Exynos850
APM co-processor times out.
- **Root cause:** APM uses I3C to talk to the PMIC; those bus clocks
must stay enabled but nothing claims them.
- **Fix approach:** Temporary `CLK_IS_CRITICAL` workaround until a
proper ACPM PMIC driver manages the clocks.
- **Version info:** none in the message.
### Step 1.4: Hidden Bug Fix Detection
**Record:** Yes — described as a workaround, but it fixes real broken
platform behavior (ACPM timeouts). Same pattern as other
`CLK_IS_CRITICAL` entries in this file for clocks that must stay on
without a consumer driver.
---
## Phase 2: Diff Analysis
### Step 2.1: Change Inventory
**Record:**
- **File:** `drivers/clk/samsung/clk-exynos850.c` (+3 / −2, net +1 line)
- **Functions:** `apm_gate_clks[]` static init table (inside
`exynos850_cmu_apm` init path)
- **Scope:** Single-file, surgical hardware workaround
### Step 2.2: Code Flow Change
**Record:**
- **Hunk 1 (I3C PCLK gate):** `GATE(..., 0, 0)` → `GATE(...,
CLK_IS_CRITICAL, 0)` for `gout_i3c_pclk`
- **Hunk 2 (I3C SCLK gate):** `GATE(..., 0, 0)` → `GATE(...,
CLK_IS_CRITICAL, 0)` for `gout_i3c_sclk`
- **Path affected:** Boot-time APM CMU clock registration; prevents
automatic disable of I3C clocks after init.
### Step 2.3: Bug Mechanism
**Record:**
- **Category:** Hardware workaround / clock-gating correctness
- **Mechanism:** Ungated clocks with no consumer get disabled by
`clk_disable_unused()`; APM I3C to PMIC then stops working and ACPM
mailbox traffic times out.
### Step 2.4: Fix Quality
**Record:**
- Obviously correct: mirrors `gout_pmu_alive_pclk` on line 698 in the
same table.
- Minimal, no API changes.
- **Regression risk:** Low — keeps two clocks enabled that must remain
on; minor power cost on Exynos850 only.
---
## Phase 3: Git History Investigation
### Step 3.1: Blame
**Record:** In this checkout, I3C gate lines are at 687–690 with flags
`0, 0`. Blame points to `a112b91dd6349` (history is flattened in this
stable checkout). Verified directly: buggy code is present at HEAD.
### Step 3.2: Fixes: Tag
**Record:** N/A — no `Fixes:` tag.
### Step 3.3: Related File History
**Record:**
- Commit `44984aaf1aa72` on `master` is this fix.
- Related on master: `e57c36bc1a3e4` (APM-to-AP mailbox clock).
- Fix is **not** an ancestor of HEAD (`fix NOT in HEAD`).
- Standalone 1/1 patch (b4 dig `-a` shows only v1).
### Step 3.4: Author Context
**Record:** Alexey Klimov (Linaro). Reviewed by Sam Protsenko (original
Exynos850 clk author per file copyright). Krzysztof Kozlowski (Samsung
clk maintainer) committed it.
### Step 3.5: Dependencies
**Record:** No prerequisites. Uses existing `CLK_IS_CRITICAL` and
`GATE()` macro. Applies standalone.
---
## Phase 4: Mailing List and External Research
### Step 4.1: Original Discussion
**Record:**
- **URL:** https://patch.msgid.link/20260430-exynos850-i3c-
criticalclocks-v1-1-6e1fd8dfa21b@linaro.org
- **Revisions:** v1 only
- **Feedback:** Sam Protsenko Reviewed-by (May 8); Tudor Ambarus
Reviewed-by (May 6); Krzysztof Kozlowski "Applied, thanks!" (May 14)
- **Stable nomination:** none in thread
- **NAKs:** none
### Step 4.2: Reviewers
**Record:** CC'd: Krzysztof Kozlowski, Sylwester Nawrocki, Chanwoo Choi,
Alim Akhtar, Michael Turquette, Stephen Boyd, linux-clk@vger.kernel.org,
linux-samsung-soc@vger.kernel.org. Appropriate maintainers were
included.
### Step 4.3: Bug Report
**Record:** No external bug report or syzbot link. Issue comes from
platform bring-up experience (Linaro/Samsung Exynos850 work).
### Step 4.4: Related Patches
**Record:** Standalone; not part of a multi-patch series.
### Step 4.5: Stable List History
**Record:** Lore fetch blocked by bot protection for web search; mbox
thread has no stable discussion. UNVERIFIED for lore.kernel.org/stable
search.
---
## Phase 5: Code Semantic Analysis
### Step 5.1: Key Functions
**Record:** `apm_gate_clks[]` in `drivers/clk/samsung/clk-exynos850.c`;
registered via `exynos850_cmu_apm` `CLK_OF_DECLARE` path.
### Step 5.2: Callers
**Record:** Samsung CMU init during early DT clock probe for
`samsung,exynos850-cmu-apm` (present in
`arch/arm64/boot/dts/exynos/exynos850.dtsi`). Runs at boot on Exynos850
boards.
### Step 5.3: Callees
**Record:** `GATE()` macro populates `samsung_gate_clock` with `.flags =
CLK_IS_CRITICAL`, preventing disable when unused.
### Step 5.4: Reachability
**Record:** Boot path on Exynos850 (`exynos850-e850-96.dts`,
`exynosautov920*.dts`, etc.). ACPM (`drivers/firmware/samsung/exynos-
acpm.c`) uses mailbox to APM; PMIC access depends on APM I3C staying up.
### Step 5.5: Similar Patterns
**Record:** Same file already uses `CLK_IS_CRITICAL` for
`gout_pmu_alive_pclk` (line 698) and many other gates. GPIO gates use
`CLK_IGNORE_UNUSED` with TODO comments for the same class of problem.
---
## Phase 6: Cross-Reference Against Local Tree
### Step 6.1: Buggy Code Present?
**Record:** **Yes.** Local tree is **v6.18.43** (`git describe HEAD` →
`v6.18.43-1-gc7f0dac02d232`, Makefile 6.18.43). At HEAD lines 687–690:
```687:690:drivers/clk/samsung/clk-exynos850.c
GATE(CLK_GOUT_I3C_PCLK, "gout_i3c_pclk", "dout_apm_bus",
CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_PCLK, 21, 0, 0),
GATE(CLK_GOUT_I3C_SCLK, "gout_i3c_sclk", "mout_apm_i3c",
CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_SCLK, 21, 0, 0),
```
Also confirmed at `v6.18` and `v6.18.43` tags. Exynos850 DT and drivers
are present in this tree.
### Step 6.2: Backport Complications
**Record:** Clean apply expected — 5-line change, no conflicts. File is
2338 lines with no recent churn in this stable branch.
### Step 6.3: Related Fixes Already Present?
**Record:** No — `git merge-base --is-ancestor 44984aaf1aa72 HEAD` → fix
**NOT** in HEAD.
---
## Phase 7: Subsystem and Maintainer Context
### Step 7.1: Subsystem Criticality
**Record:** `drivers/clk/samsung/` — **IMPORTANT** (platform-specific
clock driver). Exynos850 is ARM64 SoC support (consumer boards +
automotive `exynosautov920`).
### Step 7.2: Subsystem Activity
**Record:** Exynos850 clk driver is actively maintained; recent master
commits add mailbox clocks and this I3C fix.
---
## Phase 8: Impact and Risk Assessment
### Step 8.1: Who Is Affected
**Record:** Exynos850 platform users only — WinLink E850-96, Exynos Auto
V920, and other `samsung,exynos850` boards using ACPM/APM PMIC
communication.
### Step 8.2: Trigger Conditions
**Record:** Every boot on affected hardware after clock init completes
and `clk_disable_unused()` runs. Deterministic, not a race. Unprivileged
users cannot trigger directly, but all Exynos850 boots hit this path.
### Step 8.3: Failure Mode Severity
**Record:** ACPM communication timeouts → broken PMIC co-processor path.
**Severity: HIGH** for affected platforms (essential firmware
communication broken; power/PMIC management non-functional). Not a
kernel oops, but platform is effectively broken for ACPM consumers.
### Step 8.4: Risk-Benefit
**Record:**
- **Benefit:** HIGH for Exynos850 users on 6.18.y
- **Risk:** VERY LOW — 2 flag changes + comment; established pattern
- **Ratio:** Strong benefit for affected hardware, negligible risk
elsewhere
---
## Phase 9: Final Synthesis
### Step 9.1: Evidence Summary
**FOR backport:**
- Real, reproducible platform bug in this tree (6.18.43)
- Breaks ACPM/APM PMIC communication on every affected boot
- Tiny, obviously correct hardware workaround
- Reviewed by Exynos850 platform experts and committed by clk maintainer
- Fits hardware-quirk exception (clock must stay on)
- Clean backport, no dependencies
- Fix not yet in stable/linux-6.18.y
**AGAINST backport:**
- Platform-specific (Exynos850 only)
- Labeled "temporary workaround"
- No kernel crash/oops/security issue — functional timeout
- No explicit stable nomination in review thread
**Unresolved:** Stable mailing list search blocked by lore bot
protection.
### Step 9.2: Stable Rules Checklist
1. Obviously correct and tested? **PASS** — matches existing
`CLK_IS_CRITICAL` pattern; reviewed by platform developers
2. Fixes a real bug affecting users? **PASS** — ACPM timeouts on
Exynos850
3. Important issue? **PASS** — breaks essential APM/PMIC communication
on affected SoCs
4. Small and contained? **PASS** — 5 lines, one file
5. No new features or APIs? **PASS** — flag change only
6. Can apply to local tree? **PASS** — buggy code present, clean apply
### Step 9.3: Exception Category
**Record:** Hardware quirk/workaround — clocks that must remain enabled
for PMIC I3C on APM, analogous to existing `CLK_IS_CRITICAL` entries in
the same table.
### Step 9.4: Decision Rationale
Exynos850 support is fully present in this 6.18.43 stable tree, and the
I3C clock gating bug is present without the fix. Without this patch,
ACPM communication with the APM co-processor fails after boot-time clock
initialization — a serious functional defect for every Exynos850
deployment on 6.18.y. The fix is minimal, follows an established pattern
in the same file, and carries negligible regression risk.
---
## Verification
- [Phase 1] Parsed subject, tags, body; no Fixes:/Reported-by/syzbot;
two Reviewed-by from Linaro
- [Phase 2] Diff: 5 lines in `clk-exynos850.c`, `CLK_IS_CRITICAL` on two
I3C gates
- [Phase 3] `git describe HEAD` → v6.18.43; `44984aaf1aa72` on master;
`fix NOT in HEAD`
- [Phase 3] `git show 44984aaf1aa72` — full commit message and patch
confirmed
- [Phase 3] `git cat-file -e v6.18:drivers/clk/samsung/clk-exynos850.c`
— file exists (2338 lines)
- [Phase 3] `git show v6.18.43:...` — I3C gates have `0, 0` flags
(buggy)
- [Phase 4] `b4 dig -c 44984aaf1aa72` — lore URL found
- [Phase 4] `b4 dig -c 44984aaf1aa72 -w` — maintainers CC'd
- [Phase 4] `b4 dig -c 44984aaf1aa72 -a` — v1 only, standalone
- [Phase 4] `/tmp/exynos850-i3c.mbox` — Reviewed-by from Sam Protsenko
and Tudor Ambarus; Krzysztof applied; no stable nomination
- [Phase 5] Grep: `gout_i3c_pclk` at lines 687–690 with flags `0, 0`;
`gout_pmu_alive_pclk` uses `CLK_IS_CRITICAL` at line 698
- [Phase 5] DT: `exynos850.dtsi`, `exynos850-e850-96.dts`,
`exynosautov920.dtsi` present
- [Phase 5] ACPM driver present at `drivers/firmware/samsung/exynos-
acpm.c`
- [Phase 6] HEAD detached from `stable/linux-6.18.y` at Linux 6.18.43
- [Phase 6] Buggy code verified at HEAD; fix absent from tree
- [Phase 8] Failure mode: ACPM timeouts, HIGH severity for Exynos850
platforms
- UNVERIFIED: lore.kernel.org/stable search (bot protection)
**YES**
drivers/clk/samsung/clk-exynos850.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/samsung/clk-exynos850.c b/drivers/clk/samsung/clk-exynos850.c
index 56f27697c76b1..413faf14eded9 100644
--- a/drivers/clk/samsung/clk-exynos850.c
+++ b/drivers/clk/samsung/clk-exynos850.c
@@ -684,10 +684,11 @@ static const struct samsung_gate_clock apm_gate_clks[] __initconst = {
CLK_CON_GAT_GOUT_APM_APBIF_RTC_PCLK, 21, 0, 0),
GATE(CLK_GOUT_TOP_RTC_PCLK, "gout_top_rtc_pclk", "dout_apm_bus",
CLK_CON_GAT_GOUT_APM_APBIF_TOP_RTC_PCLK, 21, 0, 0),
+ /* TODO: Should be dealt with or enabled in PMIC ACPM driver */
GATE(CLK_GOUT_I3C_PCLK, "gout_i3c_pclk", "dout_apm_bus",
- CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_PCLK, 21, 0, 0),
+ CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_PCLK, 21, CLK_IS_CRITICAL, 0),
GATE(CLK_GOUT_I3C_SCLK, "gout_i3c_sclk", "mout_apm_i3c",
- CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_SCLK, 21, 0, 0),
+ CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_SCLK, 21, CLK_IS_CRITICAL, 0),
GATE(CLK_GOUT_SPEEDY_PCLK, "gout_speedy_pclk", "dout_apm_bus",
CLK_CON_GAT_GOUT_APM_SPEEDY_APM_PCLK, 21, 0, 0),
/* TODO: Should be enabled in GPIO driver (or made CLK_IS_CRITICAL) */
--
2.53.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH AUTOSEL 6.18] clk: samsung: exynos990: Fix PERIC0/1 USI clock types
[not found] <20260831133314.4125787-1-sashal@kernel.org>
2026-08-31 13:23 ` [PATCH AUTOSEL 6.18-6.1] clk: samsung: exynos850: mark APM I3C clocks as critical Sasha Levin
@ 2026-08-31 13:29 ` Sasha Levin
1 sibling, 0 replies; 2+ messages in thread
From: Sasha Levin @ 2026-08-31 13:29 UTC (permalink / raw)
To: patches, stable
Cc: Denzeel Oliva, Krzysztof Kozlowski, Sasha Levin, s.nawrocki,
cw00.choi, peter.griffin, sboyd, bmasney+clk, jbrunet+clk,
linux-samsung-soc, linux-clk, linux-arm-kernel, linux-kernel
From: Denzeel Oliva <wachiturroxd150@gmail.com>
[ Upstream commit e11560b050ce867bd7d3ccea138231db54e2250a ]
Use nMUX() for USI and UART user muxes to allow reparenting between
OSC and CMU IP output when changing rates, and use DIV_F() with
CLK_SET_RATE_PARENT on their dividers and gates so rate requests
propagate upward.
Consolidate identical USI parent arrays into shared
mout_peric0_nonbususer_p and mout_peric1_nonbususer_p.
Signed-off-by: Denzeel Oliva <wachiturroxd150@gmail.com>
Link: https://patch.msgid.link/20260528-perics-usi-v1-1-13a6ee4d1a6f@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
LLM Generated explanations, may be completely bogus:
# Stable Backport Analysis: `clk: samsung: exynos990: Fix PERIC0/1 USI
clock types`
**Local tree:** `v6.18.44` (Linux 6.18.44)
---
## PHASE 1: COMMIT MESSAGE FORENSICS
**Step 1.1 — Subject line**
Record: `[clk: samsung: exynos990]` `[Fix]` — Correct PERIC0/1 USI clock
types (mux/div clock framework flags).
**Step 1.2 — Tags**
Record:
- `Signed-off-by: Denzeel Oliva <wachiturroxd150@gmail.com>` (author)
- `Link: https://patch.msgid.link/20260528-perics-
usi-v1-1-13a6ee4d1a6f@gmail.com`
- `Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>` (clk/samsung
maintainer)
- No `Fixes:`, `Reported-by:`, `Tested-by:`, `Reviewed-by:`, `Cc:
stable@vger.kernel.org`
Notable: maintainer commit; no fuzzer or user bug reports.
**Step 1.3 — Body analysis**
Record:
- **Bug:** PERIC0/1 USI and UART user muxes use `MUX()`
(`CLK_SET_RATE_NO_REPARENT`) and plain `DIV()` without
`CLK_SET_RATE_PARENT`, so rate changes cannot reparent between
`oscclk` and `dout_cmu_peric*_ip`, and rate requests do not propagate
up the tree.
- **Symptom:** USI peripherals (UART/SPI/I2C via Samsung USI blocks) and
UART debug cannot get correct clock rates when drivers call
`clk_set_rate()`.
- **Root cause:** Wrong clock-type macros at PERIC bring-up (author's
earlier PERIC0/1 commit).
- **Version info:** None explicit; bug introduced when PERIC0/1 support
landed in 6.18.
**Step 1.4 — Hidden bug fix?**
Record: **Yes.** Despite "Fix" in the subject, this is a functional
clock-tree correctness bug, not cosmetic cleanup. Same class of bug
fixed earlier on GS101 (`7b54d9113cd49`).
---
## PHASE 2: DIFF ANALYSIS
**Step 2.1 — Inventory**
Record:
- **File:** `drivers/clk/samsung/clk-exynos990.c` only (+143 / −164
lines, net −21)
- **Functions/sections:** `peric0_mux_clks[]`, `peric0_div_clks[]`,
`peric1_mux_clks[]`, `peric1_div_clks[]`, parent-name arrays
- **Scope:** Single-file, mechanical clock registration fix
**Step 2.2 — Code flow per hunk**
Record:
- **PERIC0/1 parent arrays:** 11+12 duplicate `PNAME()` arrays → 2
shared `mout_peric*_nonbususer_p` arrays (no behavior change).
- **Mux clocks:** `MUX()` → `nMUX()` for UART_DBG and all USI user
muxes. Before: reparenting blocked on rate change. After: reparenting
between OSC (~24.5 MHz) and CMU IP output allowed.
- **Div clocks:** `DIV()` → `DIV_F(..., CLK_SET_RATE_PARENT, 0)` for all
USI dividers. Before: rate requests stopped at divider. After:
propagate to parent mux.
- **Gates:** unchanged (commit message mentions gates, but diff does not
modify `GATE()` entries).
**Step 2.3 — Bug mechanism**
Record: **Logic / correctness fix** in clock framework registration.
- `MUX()` sets `CLK_SET_RATE_NO_REPARENT` (see `clk.h` line 145).
- `nMUX()` clears that flag (line 151–152).
- `DIV_F()` with `CLK_SET_RATE_PARENT` enables upward rate propagation.
- Category: hardware clock configuration bug; analogous to GS101 PERIC0
USI SPI fix.
**Step 2.4 — Fix quality**
Record:
- **Obviously correct:** Matches established GS101 pattern for the same
IP block family.
- **Minimal:** Only affected clocks changed; parent arrays consolidated.
- **Regression risk:** Low — enables intended CCF behavior; no API or
structural changes.
- **Note:** Commit message overstates gate changes; gates remain plain
`GATE()` without `CLK_SET_RATE_PARENT` (unlike GS101). Maintainer
accepted as-is.
---
## PHASE 3: GIT HISTORY INVESTIGATION
**Step 3.1 — Blame**
Record: Buggy `MUX(CLK_MOUT_PERIC0_USI00_USI_USER, ...)` introduced in
`b3b314ef13e46` (Denzeel Oliva, 2025-09-04) — "Add PERIC0 and PERIC1
clock support". Present since v6.18.
**Step 3.2 — Fixes: tag**
Record: N/A — no `Fixes:` tag. Originating commit `b3b314ef13e46` is an
ancestor of `v6.18.44`.
**Step 3.3 — Related file history**
Record:
- `bdd03ebf721f7` (2024-12-14): Introduce Exynos990 clock driver
- `b3b314ef13e46` (2025-09-07): Add PERIC0/PERIC1 — introduced bug
- `44b0a8e433aaa`: Enable PERIC0/PERIC1 in exynos990 DT
- Fix commit `e11560b050ce8` is the only change to this file between
`v6.18.44` and mainline
- Standalone 1/1 patch, no series dependencies
**Step 3.4 — Author context**
Record: Denzeel Oliva authored both PERIC bring-up and this fix.
Krzysztof Kozlowski (samsung-clk maintainer) committed it.
**Step 3.5 — Prerequisites**
Record: No dependencies. `nMUX`, `DIV_F`, and `CLK_SET_RATE_PARENT` all
exist in this tree's `drivers/clk/samsung/clk.h`. Patch applies cleanly
(`git apply --check` passed).
---
## PHASE 4: MAILING LIST AND EXTERNAL RESEARCH
**Step 4.1 — Original discussion**
Record:
- `b4 dig -c e11560b050ce8` → https://patch.msgid.link/20260528-perics-
usi-v1-1-13a6ee4d1a6f@gmail.com
- Single-patch series (v1, 1/1)
- Krzysztof Kozlowski: "Applied, thanks!" — no review thread, no stable
nomination, no NAKs
**Step 4.2 — Reviewers**
Record: CC'd Krzysztof Kozlowski, Sylwester Nawrocki, Chanwoo Choi, Alim
Akhtar, Michael Turquette, Stephen Boyd, Brian Masney; lists `linux-
clk`, `linux-samsung-soc`, `linux-arm-kernel`.
**Step 4.3 — Bug reports**
Record: N/A — no `Reported-by:` or bugzilla/syzbot links.
**Step 4.4 — Related patches**
Record: Direct precedent — `7b54d9113cd49` "clk: samsung: gs101:
propagate PERIC0 USI SPI clock rate" documents identical mechanism (nMUX
+ DIV_F + GATE CLK_SET_RATE_PARENT for USI on GS101 PERIC0).
**Step 4.5 — Stable list**
Record: No stable-list discussion found for this patch.
---
## PHASE 5: CODE SEMANTIC ANALYSIS
**Step 5.1 — Key symbols**
Record: PERIC0/1 mux/div clock tables in `clk-exynos990.c`; no new
functions.
**Step 5.2 — Callers**
Record: Clocks registered at init via exynos990 CMU probe; consumed at
runtime by device drivers via `clk_get()` / `clk_set_rate()`. PERIC0/1
CMUs are enabled in `exynos990.dtsi` (`cmu_peric0`, `cmu_peric1`).
**Step 5.3 — Callees**
Record: Samsung CCF helpers (`samsung_clk_register_mux`,
`samsung_clk_register_div`); standard Linux common clock framework
rate/recalc paths.
**Step 5.4 — Reachability**
Record: Reachable when exynos990 drivers request peripheral clocks. USI
device nodes are not yet in mainline exynos990 DTS, but PERIC clock
controllers are live and UART_DBG mux is also fixed. Any future or out-
of-tree USI/UART driver using these clocks hits the bug today.
**Step 5.5 — Similar patterns**
Record: GS101 PERIC0/1 USI clocks use `nMUX` +
`DIV_F(CLK_SET_RATE_PARENT)` + `GATE(..., CLK_SET_RATE_PARENT)`.
Exynos850 CMGP USI uses `MUX_F(CLK_SET_RATE_PARENT)` +
`DIV_F(CLK_SET_RATE_PARENT)`. Exynos990 PERIC was the outlier using
plain `MUX`/`DIV`.
---
## PHASE 6: CROSS-REFERENCE WITH LOCAL TREE (v6.18.44)
**Step 6.1 — Buggy code present?**
Record: **Yes.** Current HEAD still has `MUX()` for USI user muxes and
`DIV()` for USI dividers (e.g. lines 1568–1640). Fix commit
`e11560b050ce8` is **not** in HEAD. Bug introduced in 6.18 with PERIC
support.
**Step 6.2 — Backport complications**
Record: **Clean apply** — `git apply --check` on `e11560b050ce8` patch
succeeded against HEAD. Only one intervening commit on this file between
v6.18.44 and the fix.
**Step 6.3 — Related fixes already present?**
Record: **No** equivalent fix in this tree.
---
## PHASE 7: SUBSYSTEM CONTEXT
**Step 7.1 — Subsystem / criticality**
Record: `drivers/clk/samsung` — **PERIPHERAL** (Exynos990 platform-
specific), but PERIC clocks underpin UART/SPI/I2C for the SoC.
**Step 7.2 — Activity**
Record: exynos990 clk driver actively developed; PERIC support added in
6.18 cycle.
---
## PHASE 8: IMPACT AND RISK
**Step 8.1 — Who is affected**
Record: Exynos990 users (Galaxy S21 family boards: x1s, c1s, r8s, etc.
in `arch/arm64/boot/dts/exynos/`). Config/platform-specific, not
universal.
**Step 8.2 — Trigger conditions**
Record: Any driver calling `clk_set_rate()` on a PERIC0/1 USI or
UART_DBG clock. Common during SPI/UART/I2C device probe and transfer
setup. Not security-relevant; unprivileged users cannot trigger
directly.
**Step 8.3 — Failure mode severity**
Record: **Incorrect clock rates** → peripheral probe failure, wrong
baud/SPI timing, device malfunction. **Severity: MEDIUM** (functional
hardware breakage, not kernel crash/oops/corruption).
**Step 8.4 — Risk vs benefit**
Record:
- **Benefit:** Fixes a regression introduced in 6.18 itself; unblocks
correct USI/UART clock operation on exynos990; matches proven GS101
fix pattern.
- **Risk:** Very low — declarative flag changes only, clean apply,
maintainer-reviewed.
- **Ratio:** Favorable for 6.18.y where the buggy PERIC code already
shipped.
---
## PHASE 9: FINAL SYNTHESIS
**Step 9.1 — Evidence summary**
**FOR:**
- Real functional bug in clock registration
- Bug introduced in this stable series (6.18) with PERIC0/1 support
- Buggy code confirmed present in v6.18.44
- Small, mechanical, obviously correct fix
- Clean apply, no dependencies
- Direct precedent (GS101 USI clock fix)
- Samsung clk maintainer committed
**AGAINST:**
- No crash/security/corruption — functional hardware issue only
- No user reports, syzbot, or Tested-by
- exynos990 USI device nodes not yet in mainline DTS (limited immediate
impact)
- Commit message inaccurately claims gate changes that aren't in the
diff
- Platform-specific, narrow user base on mainline stable
**Unresolved:** Whether gate clocks also need `CLK_SET_RATE_PARENT` (as
on GS101) — not addressed by this commit; maintainer accepted without
gate changes.
**Step 9.2 — Stable rules checklist**
| Criterion | Result |
|-----------|--------|
| 1. Obviously correct and tested? | **PASS** — matches GS101 pattern;
no Tested-by |
| 2. Fixes real bug affecting users? | **PASS** — broken clock rate
setting for USI/UART |
| 3. Important issue? | **PASS** (borderline) — MEDIUM severity hardware
functionality bug, regression in 6.18 |
| 4. Small and contained? | **PASS** — single file, mechanical |
| 5. No new features/APIs? | **PASS** — corrects existing clock flags
only |
| 6. Applies to local tree? | **PASS** — clean apply verified |
**Step 9.3 — Exception categories**
Record: N/A — not a device ID, quirk, DT, build, or docs fix. Standard
driver correctness fix.
**Step 9.4 — Decision rationale**
This is a regression fix for code that shipped broken in Linux 6.18. The
PERIC0/1 USI and UART mux/div clocks were registered with flags that
prevent the common clock framework from reparenting and propagating rate
changes — exactly the problem documented and fixed on GS101. For the
v6.18.44 tree, the buggy code is present, the fix applies cleanly, and
exynos990 platform support (including PERIC CMUs in DT) is already in
this release. While severity is functional rather than a kernel crash,
correcting a driver bug introduced in the same stable series is
appropriate stable material.
---
## Verification
- [Phase 1] Parsed subject, tags, body from provided commit message
- [Phase 2] Read `clk.h` lines 144–198: confirmed `MUX()` =
`CLK_SET_RATE_NO_REPARENT`, `nMUX()` allows reparenting, `DIV_F()`
supports `CLK_SET_RATE_PARENT`
- [Phase 2] Full diff via `git show e11560b050ce8`: 143+/164−, no gate
changes despite message claim
- [Phase 3] `git describe HEAD` → `v6.18.44`; Makefile → 6.18.44
- [Phase 3] `git blame` lines 1568–1570 → `b3b314ef13e46` introduced
buggy MUX
- [Phase 3] `git merge-base --is-ancestor b3b314ef13e46 v6.18.44` →
PERIC0 in tree; fix NOT in HEAD
- [Phase 3] `git tag --contains b3b314ef13e46 | grep v6.18` → present
since v6.18-rc1
- [Phase 3] `git show 7b54d9113cd49` — GS101 precedent with detailed
USI/SPI clk_set_rate explanation
- [Phase 4] `b4 dig -c e11560b050ce8` → lore URL found
- [Phase 4] `b4 dig -w` → maintainers CC'd
- [Phase 4] `/tmp/perics-usi.mbx` — only maintainer "Applied, thanks!"
reply; no stable nomination
- [Phase 5] Grep exynos990 DTS — `cmu_peric0`/`cmu_peric1` enabled; no
USI device nodes yet
- [Phase 5] Grep `clk-gs101.c` — CLK_SET_RATE_PARENT on USI mux/div/gate
clocks
- [Phase 6] Grep current tree — buggy `MUX()`/`DIV()` still present at
lines 1565–1640, 2123+
- [Phase 6] `git apply --check` of fix patch against HEAD → clean apply
- [Phase 6] `git log v6.18.44..e11560b050ce8 -- clk-exynos990.c` → 1
commit (the fix)
- [Phase 8] Failure mode assessed as MEDIUM (functional), not CRITICAL
(no oops/corruption)
**YES**The background searches finished and line up with the earlier
analysis:
- **PERIC0 history:** Buggy PERIC0/1 support came in with
`b3b314ef13e46` ("Add PERIC0 and PERIC1 clock support"), which is in
this `v6.18.44` tree.
- **Fix commit:** The fix is `e11560b050ce8` on mainline; it is **not**
in the checked-out `v6.18.44` tree yet.
- **GS101 precedent:** `7b54d9113cd49` ("propagate PERIC0 USI SPI clock
rate") is the same class of fix and is present in this tree's history.
That supports the earlier verdict: **YES** for backport to this `6.18.y`
tree.
drivers/clk/samsung/clk-exynos990.c | 307 +++++++++++++---------------
1 file changed, 143 insertions(+), 164 deletions(-)
diff --git a/drivers/clk/samsung/clk-exynos990.c b/drivers/clk/samsung/clk-exynos990.c
index 6277dd557fab6..4385c3b76dd68 100644
--- a/drivers/clk/samsung/clk-exynos990.c
+++ b/drivers/clk/samsung/clk-exynos990.c
@@ -1546,54 +1546,44 @@ static const unsigned long peric0_clk_regs[] __initconst = {
/* Parent clock list for CMU_PERIC0 muxes */
PNAME(mout_peric0_bus_user_p) = { "oscclk", "dout_cmu_peric0_bus" };
-PNAME(mout_peric0_uart_dbg_p) = { "oscclk", "dout_cmu_peric0_ip" };
-PNAME(mout_peric0_usi00_user_p) = { "oscclk", "dout_cmu_peric0_ip" };
-PNAME(mout_peric0_usi01_user_p) = { "oscclk", "dout_cmu_peric0_ip" };
-PNAME(mout_peric0_usi02_user_p) = { "oscclk", "dout_cmu_peric0_ip" };
-PNAME(mout_peric0_usi03_user_p) = { "oscclk", "dout_cmu_peric0_ip" };
-PNAME(mout_peric0_usi04_user_p) = { "oscclk", "dout_cmu_peric0_ip" };
-PNAME(mout_peric0_usi05_user_p) = { "oscclk", "dout_cmu_peric0_ip" };
-PNAME(mout_peric0_usi13_user_p) = { "oscclk", "dout_cmu_peric0_ip" };
-PNAME(mout_peric0_usi14_user_p) = { "oscclk", "dout_cmu_peric0_ip" };
-PNAME(mout_peric0_usi15_user_p) = { "oscclk", "dout_cmu_peric0_ip" };
-PNAME(mout_peric0_usi_i2c_user_p) = { "oscclk", "dout_cmu_peric0_ip" };
+PNAME(mout_peric0_nonbususer_p) = { "oscclk", "dout_cmu_peric0_ip" };
static const struct samsung_mux_clock peric0_mux_clks[] __initconst = {
MUX(CLK_MOUT_PERIC0_BUS_USER, "mout_peric0_bus_user",
mout_peric0_bus_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_BUS_USER,
4, 1),
- MUX(CLK_MOUT_PERIC0_UART_DBG, "mout_peric0_uart_dbg",
- mout_peric0_uart_dbg_p, PLL_CON0_MUX_CLKCMU_PERIC0_UART_DBG,
- 4, 1),
- MUX(CLK_MOUT_PERIC0_USI00_USI_USER, "mout_peric0_usi00_usi_user",
- mout_peric0_usi00_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI00_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC0_USI01_USI_USER, "mout_peric0_usi01_usi_user",
- mout_peric0_usi01_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI01_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC0_USI02_USI_USER, "mout_peric0_usi02_usi_user",
- mout_peric0_usi02_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI02_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC0_USI03_USI_USER, "mout_peric0_usi03_usi_user",
- mout_peric0_usi03_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI03_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC0_USI04_USI_USER, "mout_peric0_usi04_usi_user",
- mout_peric0_usi04_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI04_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC0_USI05_USI_USER, "mout_peric0_usi05_usi_user",
- mout_peric0_usi05_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI05_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC0_USI13_USI_USER, "mout_peric0_usi13_usi_user",
- mout_peric0_usi13_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI13_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC0_USI14_USI_USER, "mout_peric0_usi14_usi_user",
- mout_peric0_usi14_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI14_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC0_USI15_USI_USER, "mout_peric0_usi15_usi_user",
- mout_peric0_usi15_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI15_USI_USER,
- 4, 1),
+ nMUX(CLK_MOUT_PERIC0_UART_DBG, "mout_peric0_uart_dbg",
+ mout_peric0_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC0_UART_DBG,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI00_USI_USER, "mout_peric0_usi00_usi_user",
+ mout_peric0_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI00_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI01_USI_USER, "mout_peric0_usi01_usi_user",
+ mout_peric0_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI01_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI02_USI_USER, "mout_peric0_usi02_usi_user",
+ mout_peric0_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI02_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI03_USI_USER, "mout_peric0_usi03_usi_user",
+ mout_peric0_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI03_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI04_USI_USER, "mout_peric0_usi04_usi_user",
+ mout_peric0_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI04_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI05_USI_USER, "mout_peric0_usi05_usi_user",
+ mout_peric0_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI05_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI13_USI_USER, "mout_peric0_usi13_usi_user",
+ mout_peric0_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI13_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI14_USI_USER, "mout_peric0_usi14_usi_user",
+ mout_peric0_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI14_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI15_USI_USER, "mout_peric0_usi15_usi_user",
+ mout_peric0_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI15_USI_USER,
+ 4, 1),
MUX(CLK_MOUT_PERIC0_USI_I2C_USER, "mout_peric0_usi_i2c_user",
- mout_peric0_usi_i2c_user_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI_I2C_USER,
+ mout_peric0_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC0_USI_I2C_USER,
4, 1),
};
@@ -1602,42 +1592,42 @@ static const struct samsung_div_clock peric0_div_clks[] __initconst = {
"mout_peric0_uart_dbg",
CLK_CON_DIV_DIV_CLK_PERIC0_UART_DBG,
0, 4),
- DIV(CLK_DOUT_PERIC0_USI00_USI, "dout_peric0_usi00_usi",
- "mout_peric0_usi00_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI00_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC0_USI01_USI, "dout_peric0_usi01_usi",
- "mout_peric0_usi01_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI01_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC0_USI02_USI, "dout_peric0_usi02_usi",
- "mout_peric0_usi02_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI02_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC0_USI03_USI, "dout_peric0_usi03_usi",
- "mout_peric0_usi03_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI03_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC0_USI04_USI, "dout_peric0_usi04_usi",
- "mout_peric0_usi04_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI04_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC0_USI05_USI, "dout_peric0_usi05_usi",
- "mout_peric0_usi05_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI05_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC0_USI13_USI, "dout_peric0_usi13_usi",
- "mout_peric0_usi13_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI13_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC0_USI14_USI, "dout_peric0_usi14_usi",
- "mout_peric0_usi14_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI14_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC0_USI15_USI, "dout_peric0_usi15_usi",
- "mout_peric0_usi15_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI15_USI,
- 0, 4),
+ DIV_F(CLK_DOUT_PERIC0_USI00_USI, "dout_peric0_usi00_usi",
+ "mout_peric0_usi00_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI00_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI01_USI, "dout_peric0_usi01_usi",
+ "mout_peric0_usi01_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI01_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI02_USI, "dout_peric0_usi02_usi",
+ "mout_peric0_usi02_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI02_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI03_USI, "dout_peric0_usi03_usi",
+ "mout_peric0_usi03_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI03_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI04_USI, "dout_peric0_usi04_usi",
+ "mout_peric0_usi04_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI04_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI05_USI, "dout_peric0_usi05_usi",
+ "mout_peric0_usi05_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI05_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI13_USI, "dout_peric0_usi13_usi",
+ "mout_peric0_usi13_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI13_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI14_USI, "dout_peric0_usi14_usi",
+ "mout_peric0_usi14_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI14_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI15_USI, "dout_peric0_usi15_usi",
+ "mout_peric0_usi15_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI15_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
DIV(CLK_DOUT_PERIC0_USI_I2C, "dout_peric0_usi_i2c",
"mout_peric0_usi_i2c_user",
CLK_CON_DIV_DIV_CLK_PERIC0_USI_I2C,
@@ -2107,58 +2097,47 @@ static const unsigned long peric1_clk_regs[] __initconst = {
/* Parent clock list for CMU_PERIC1 muxes */
PNAME(mout_peric1_bus_user_p) = { "oscclk", "dout_cmu_peric1_bus" };
-PNAME(mout_peric1_uart_bt_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
-PNAME(mout_peric1_usi06_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
-PNAME(mout_peric1_usi07_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
-PNAME(mout_peric1_usi08_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
-PNAME(mout_peric1_usi09_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
-PNAME(mout_peric1_usi10_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
-PNAME(mout_peric1_usi11_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
-PNAME(mout_peric1_usi12_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
-PNAME(mout_peric1_usi18_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
-PNAME(mout_peric1_usi16_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
-PNAME(mout_peric1_usi17_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
-PNAME(mout_peric1_usi_i2c_user_p) = { "oscclk", "dout_cmu_peric1_ip" };
+PNAME(mout_peric1_nonbususer_p) = { "oscclk", "dout_cmu_peric1_ip" };
static const struct samsung_mux_clock peric1_mux_clks[] __initconst = {
MUX(CLK_MOUT_PERIC1_BUS_USER, "mout_peric1_bus_user",
mout_peric1_bus_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_BUS_USER,
4, 1),
- MUX(CLK_MOUT_PERIC1_UART_BT_USER, "mout_peric1_uart_bt_user",
- mout_peric1_uart_bt_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_UART_BT_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC1_USI06_USI_USER, "mout_peric1_usi06_usi_user",
- mout_peric1_usi06_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI06_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC1_USI07_USI_USER, "mout_peric1_usi07_usi_user",
- mout_peric1_usi07_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI07_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC1_USI08_USI_USER, "mout_peric1_usi08_usi_user",
- mout_peric1_usi08_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI08_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC1_USI09_USI_USER, "mout_peric1_usi09_usi_user",
- mout_peric1_usi09_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI09_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC1_USI10_USI_USER, "mout_peric1_usi10_usi_user",
- mout_peric1_usi10_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI10_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC1_USI11_USI_USER, "mout_peric1_usi11_usi_user",
- mout_peric1_usi11_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI11_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC1_USI12_USI_USER, "mout_peric1_usi12_usi_user",
- mout_peric1_usi12_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI12_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC1_USI18_USI_USER, "mout_peric1_usi18_usi_user",
- mout_peric1_usi18_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI18_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC1_USI16_USI_USER, "mout_peric1_usi16_usi_user",
- mout_peric1_usi16_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI16_USI_USER,
- 4, 1),
- MUX(CLK_MOUT_PERIC1_USI17_USI_USER, "mout_peric1_usi17_usi_user",
- mout_peric1_usi17_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI17_USI_USER,
- 4, 1),
+ nMUX(CLK_MOUT_PERIC1_UART_BT_USER, "mout_peric1_uart_bt_user",
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_UART_BT_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC1_USI06_USI_USER, "mout_peric1_usi06_usi_user",
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI06_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC1_USI07_USI_USER, "mout_peric1_usi07_usi_user",
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI07_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC1_USI08_USI_USER, "mout_peric1_usi08_usi_user",
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI08_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC1_USI09_USI_USER, "mout_peric1_usi09_usi_user",
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI09_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC1_USI10_USI_USER, "mout_peric1_usi10_usi_user",
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI10_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC1_USI11_USI_USER, "mout_peric1_usi11_usi_user",
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI11_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC1_USI12_USI_USER, "mout_peric1_usi12_usi_user",
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI12_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC1_USI18_USI_USER, "mout_peric1_usi18_usi_user",
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI18_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC1_USI16_USI_USER, "mout_peric1_usi16_usi_user",
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI16_USI_USER,
+ 4, 1),
+ nMUX(CLK_MOUT_PERIC1_USI17_USI_USER, "mout_peric1_usi17_usi_user",
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI17_USI_USER,
+ 4, 1),
MUX(CLK_MOUT_PERIC1_USI_I2C_USER, "mout_peric1_usi_i2c_user",
- mout_peric1_usi_i2c_user_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI_I2C_USER,
+ mout_peric1_nonbususer_p, PLL_CON0_MUX_CLKCMU_PERIC1_USI_I2C_USER,
4, 1),
};
@@ -2167,46 +2146,46 @@ static const struct samsung_div_clock peric1_div_clks[] __initconst = {
"mout_peric1_uart_bt_user",
CLK_CON_DIV_DIV_CLK_PERIC1_UART_BT,
0, 4),
- DIV(CLK_DOUT_PERIC1_USI06_USI, "dout_peric1_usi06_usi",
- "mout_peric1_usi06_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC1_USI06_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC1_USI07_USI, "dout_peric1_usi07_usi",
- "mout_peric1_usi07_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC1_USI07_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC1_USI08_USI, "dout_peric1_usi08_usi",
- "mout_peric1_usi08_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC1_USI08_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC1_USI18_USI, "dout_peric1_usi18_usi",
- "mout_peric1_usi18_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC1_USI18_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC1_USI12_USI, "dout_peric1_usi12_usi",
- "mout_peric1_usi12_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC1_USI12_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC1_USI09_USI, "dout_peric1_usi09_usi",
- "mout_peric1_usi09_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC1_USI09_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC1_USI10_USI, "dout_peric1_usi10_usi",
- "mout_peric1_usi10_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC1_USI10_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC1_USI11_USI, "dout_peric1_usi11_usi",
- "mout_peric1_usi11_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC1_USI11_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC1_USI16_USI, "dout_peric1_usi16_usi",
- "mout_peric1_usi16_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC1_USI16_USI,
- 0, 4),
- DIV(CLK_DOUT_PERIC1_USI17_USI, "dout_peric1_usi17_usi",
- "mout_peric1_usi17_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC1_USI17_USI,
- 0, 4),
+ DIV_F(CLK_DOUT_PERIC1_USI06_USI, "dout_peric1_usi06_usi",
+ "mout_peric1_usi06_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC1_USI06_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC1_USI07_USI, "dout_peric1_usi07_usi",
+ "mout_peric1_usi07_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC1_USI07_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC1_USI08_USI, "dout_peric1_usi08_usi",
+ "mout_peric1_usi08_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC1_USI08_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC1_USI18_USI, "dout_peric1_usi18_usi",
+ "mout_peric1_usi18_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC1_USI18_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC1_USI12_USI, "dout_peric1_usi12_usi",
+ "mout_peric1_usi12_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC1_USI12_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC1_USI09_USI, "dout_peric1_usi09_usi",
+ "mout_peric1_usi09_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC1_USI09_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC1_USI10_USI, "dout_peric1_usi10_usi",
+ "mout_peric1_usi10_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC1_USI10_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC1_USI11_USI, "dout_peric1_usi11_usi",
+ "mout_peric1_usi11_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC1_USI11_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC1_USI16_USI, "dout_peric1_usi16_usi",
+ "mout_peric1_usi16_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC1_USI16_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC1_USI17_USI, "dout_peric1_usi17_usi",
+ "mout_peric1_usi17_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC1_USI17_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
DIV(CLK_DOUT_PERIC1_USI_I2C, "dout_peric1_usi_i2c",
"mout_peric1_usi_i2c_user",
CLK_CON_DIV_DIV_CLK_PERIC1_USI_I2C,
--
2.53.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
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[not found] <20260831133314.4125787-1-sashal@kernel.org>
2026-08-31 13:23 ` [PATCH AUTOSEL 6.18-6.1] clk: samsung: exynos850: mark APM I3C clocks as critical Sasha Levin
2026-08-31 13:29 ` [PATCH AUTOSEL 6.18] clk: samsung: exynos990: Fix PERIC0/1 USI clock types Sasha Levin
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