kernel/linux.git/drivers/clk/samsung, branch linux-7.0.y

firmware: exynos-acpm: Drop fake 'const' on handle pointer

2026-05-07T04:14:02+00:00

commit a2be37eedb52ea26938fa4cc9de1ff84963c57ad upstream. All the functions operating on the 'handle' pointer are claiming it is a pointer to const thus they should not modify the handle. In fact that's a false statement, because first thing these functions do is drop the cast to const with container_of: struct acpm_info *acpm = handle_to_acpm_info(handle); And with such cast the handle is easily writable with simple: acpm->handle.ops.pmic_ops.read_reg = NULL; The code is not correct logically, either, because functions like acpm_get_by_node() and acpm_handle_put() are meant to modify the handle reference counting, thus they must modify the handle. Modification here happens anyway, even if the reference counting is stored in the container which the handle is part of. The code does not have actual visible bug, but incorrect 'const' annotations could lead to incorrect compiler decisions. Fixes: a88927b534ba ("firmware: add Exynos ACPM protocol driver") Cc: stable@vger.kernel.org Signed-off-by: Krzysztof Kozlowski Link: https://patch.msgid.link/20260224104203.42950-2-krzysztof.kozlowski@oss.qualcomm.com Signed-off-by: Krzysztof Kozlowski Signed-off-by: Greg Kroah-Hartman

Convert 'alloc_flex' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This is the exact same thing as the 'alloc_obj()' version, only much smaller because there are a lot fewer users of the *alloc_flex() interface. As with alloc_obj() version, this was done entirely with mindless brute force, using the same script, except using 'flex' in the pattern rather than 'objs*'. Signed-off-by: Linus Torvalds

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

clk: samsung: gs101: add support for Display Process Unit (DPU) clocks

2026-01-17T19:30:38+00:00

cmu_dpu is the clock management unit used for the Display Process Unit block. It generates clocks for image scaler, compressor etc. Add support for the muxes, dividers and gates in cmu_dpu. Signed-off-by: Peter Griffin Reviewed-by: André Draszik Link: https://patch.msgid.link/20260113-dpu-clocks-v3-4-cb85424f2c72@linaro.org Signed-off-by: Krzysztof Kozlowski

clk: samsung: fix sysreg save/restore when PM is enabled for CMU

2026-01-17T19:25:56+00:00

Currently, sysreg registers of a CMU that has PM and automatic clock gating enabled are not saved / restored during runtime PM (RPM) or s2idle. During normal suspend, they are accessed too late, after the CMU (and potentially power domain) have been shut down, causing an SError. The reason is that these registers are registered to be saved/restored via a syscore suspend handler which doesn't run during RPM or s2idle. During normal suspend, this handler runs after the CMU has been shut down. This registration happens as part of samsung_clk_extended_sleep_init() via samsung_en_dyn_root_clk_gating(). When PM is enabled for a CMU, registers must be saved/restored via exynos_arm64_cmu_suspend() / exynos_arm64_cmu_resume() respectively instead. These use their own data structures and are unrelated to anything that samsung_clk_extended_sleep_init() does. Calling it unconditionally from samsung_en_dyn_root_clk_gating() therefore isn't useful. Update the code to prepare sysreg save / restore in a similar way to how it handles other clock registers in the PM case already. exynos_arm64_cmu_suspend() / exynos_arm64_cmu_resume() already handle sysreg save/restore, just the setup was incorrect. Fixes: 298fac4f4b96 ("clk: samsung: Implement automatic clock gating mode for CMUs") Signed-off-by: André Draszik Reviewed-by: Peter Griffin Link: https://patch.msgid.link/20260109-clk-samsung-autoclk-updates-v1-2-2394dcf242a9@linaro.org Signed-off-by: Krzysztof Kozlowski

clk: samsung: avoid warning message on legacy Exynos (auto clock gating)

2026-01-17T19:25:56+00:00

We currently print a warning message that the IO memory size is not compatible with automatic clock gating for many Exynos-based boards, including legacy ones, even if not requested to enable automatic clock gating in the first place. Change the test in question to avoid that warning. Fixes: 298fac4f4b96 ("clk: samsung: Implement automatic clock gating mode for CMUs") Reported-by: Marek Szyprowski Closes: https://lore.kernel.org/all/8b2c412d-3e1e-4be0-a9d5-ef67f6f0d409@samsung.com/ Suggested-by: Marek Szyprowski Signed-off-by: André Draszik Reviewed-by: Peter Griffin Link: https://patch.msgid.link/20260109-clk-samsung-autoclk-updates-v1-1-2394dcf242a9@linaro.org Signed-off-by: Krzysztof Kozlowski

clk: samsung: gs101: Enable auto_clock_gate mode for each gs101 CMU

2025-12-22T11:42:56+00:00

Enable auto clock mode, and define the additional fields which are used when this mode is enabled. /sys/kernel/debug/clk/clk_summary now reports approximately 308 running clocks and 298 disabled clocks. Prior to this commit 586 clocks were running and 17 disabled. Signed-off-by: Peter Griffin Link: https://patch.msgid.link/20251222-automatic-clocks-v7-4-fec86fa89874@linaro.org Signed-off-by: Krzysztof Kozlowski

clk: samsung: Implement automatic clock gating mode for CMUs

2025-12-22T11:42:54+00:00

Update exynos_arm64_init_clocks() so that it enables the automatic clock mode bits in the CMU option register if the auto_clock_gate flag and option_offset fields are set for the CMU. To ensure compatibility with older DTs (that specified an incorrect CMU reg size), detect this and fallback to manual clock gate mode as the auto clock mode feature depends on registers in this area. The CMU option register bits are global and effect every clock component in the CMU, as such clearing the GATE_ENABLE_HWACG bit and setting GATE_MANUAL bit on every gate register is only required if auto_clock_gate is false. Additionally if auto_clock_gate is enabled the dynamic root clock gating and memclk registers will be configured in the corresponding CMUs sysreg bank. These registers are exposed via syscon, so the register samsung_clk_save/restore paths are updated to also take a regmap. As many gates for various Samsung SoCs are already exposed in the Samsung clock drivers a new samsung_auto_clk_gate_ops is implemented. This uses some CMU debug registers to report whether clocks are enabled or disabled when operating in automatic mode. This allows /sys/kernel/debug/clk/clk_summary to still dump the entire clock tree and correctly report the status of each clock in the system. Signed-off-by: Peter Griffin Link: https://patch.msgid.link/20251222-automatic-clocks-v7-3-fec86fa89874@linaro.org Signed-off-by: Krzysztof Kozlowski

clk: samsung: exynosautov920: add clock support

2025-12-21T13:30:27+00:00

Add support for CMU_MFD which provides clocks to MFD block, and register the required compatible and cmu_info for the same. Signed-off-by: Raghav Sharma Reviewed-by: Alim Akhtar Link: https://patch.msgid.link/20251119114744.1914416-3-raghav.s@samsung.com Signed-off-by: Krzysztof Kozlowski