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8 daysMerge tag 'pwm/for-7.2-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux Pull pwm updates from Uwe Kleine-König: "The usual mixture of minor fixes, a few cleanups, a new driver and dt updates for the pwm subsystem. Thanks to Chen Ni, Devi Priya, Manish Baing, Maurice Hieronymus, Ronaldo Nunez, Rosen Penev, Shiji Yang and Yixun Lan for the actual changes and Bjorn Andersson, Conor Dooley, Frank Li, Michal Wilczynski and Rob Herring for reviews and acks" * tag 'pwm/for-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux: pwm: th1520: Remove requirement for mul_u64_u64_div_u64_roundup dt-bindings: pwm: stmpe: Drop legacy binding pwm: pca9685: Use named initializers for struct i2c_device_id pwm: pxa: Add optional bus clock dt-bindings: pwm: marvell,pxa-pwm: Add SpacemiT K3 PWM support pwm: ipq: Add missing module description pwm: stm32: Make use of mul_u64_u64_div_u64_roundup() pwm: Consistently define pci_device_ids using named initializers pwm: Driver for qualcomm ipq6018 pwm block pwm: imx27: Fix variable truncation in .apply() pwm: mediatek: correct mt7628 clock source setting pwm: mediatek: set mt7628 pwm45_fixup flag to false pwm: atmel-tcb: Remove unneeded semicolon
2026-06-05pwm: th1520: Remove requirement for mul_u64_u64_div_u64_roundupMaurice Hieronymus
The cycle register is always u32, so cycles_to_ns() can take a u32 instead of a u64. With that narrowing, cycles * NSEC_PER_SEC is at most u32::MAX * 1e9 (~4.3e18), which fits in u64 without overflow. The saturating arithmetic is therefore no longer needed, and the ceiling division can use Rust's u64::div_ceil() directly instead of the open-coded numerator/denominator form. This also drops the TODO referring to a future mul_u64_u64_div_u64_roundup kernel helper, which is no longer required. Reviewed-by: Michal Wilczynski <m.wilczynski@samsung.com> Signed-off-by: Maurice Hieronymus <mhi@mailbox.org> Link: https://patch.msgid.link/20260605-pwm-th1520-fix-v2-1-5921e3a595f7@mailbox.org Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-05-27rust: io: make IoMem and ExclusiveIoMem lifetime-parameterizedDanilo Krummrich
Add a lifetime parameter to IoMem<'a, SIZE> and ExclusiveIoMem<'a, SIZE>, storing a &'a Device<Bound> reference to tie the mapping to the device's lifetime. This mirrors the pci::Bar<'a, SIZE> design and enables drivers to hold I/O memory mappings directly in their HRT private data, tied to the device lifetime. IoRequest::iomap_* methods now return the mapping directly instead of wrapping it in Devres. Callers that need device-managed revocation can call the new into_devres() method. Acked-by: Uwe Kleine-König <ukleinek@kernel.org> Reviewed-by: Eliot Courtney <ecourtney@nvidia.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Reviewed-by: Gary Guo <gary@garyguo.net> Link: https://patch.msgid.link/20260525202921.124698-20-dakr@kernel.org Signed-off-by: Danilo Krummrich <dakr@kernel.org>
2026-05-27rust: platform: make Driver trait lifetime-parameterizedDanilo Krummrich
Add a 'bound lifetime to the associated Data, changing type Data to type Data<'bound>. This allows the driver's bus device private data to capture the device / driver bound lifetime; device resources can be stored directly by reference rather than requiring Devres. The probe() and unbind() callbacks thus gain a 'bound lifetime parameter on the methods themselves; avoiding a global lifetime on the trait impl. Existing drivers set type Data<'bound> = Self, preserving the current behavior. Acked-by: Uwe Kleine-König <ukleinek@kernel.org> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Gary Guo <gary@garyguo.net> Link: https://patch.msgid.link/20260525202921.124698-14-dakr@kernel.org Signed-off-by: Danilo Krummrich <dakr@kernel.org>
2026-05-27rust: device: make Core and CoreInternal lifetime-parameterizedDanilo Krummrich
Device<Core> references in probe callbacks are scoped to the callback, not the full binding duration. Add a lifetime parameter to Core and CoreInternal to accurately represent this in the type system. Suggested-by: Gary Guo <gary@garyguo.net> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Reviewed-by: Eliot Courtney <ecourtney@nvidia.com> Reviewed-by: Gary Guo <gary@garyguo.net> Link: https://patch.msgid.link/20260525202921.124698-12-dakr@kernel.org Signed-off-by: Danilo Krummrich <dakr@kernel.org>
2026-05-27rust: driver: decouple driver private data from driver typeDanilo Krummrich
Add a type Data<'bound> associated type to all bus driver traits, decoupling the driver's bus device private data type from the driver struct itself. In the context of adding a 'bound lifetime, making this an associated type has the advantage that it allows us to avoid a driver trait global lifetime and it avoids the need for ForLt for bus device private data; both of which make the subsequent implementation by buses much simpler. All existing drivers and doc examples set type Data = Self to preserve the current behavior. Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Reviewed-by: Gary Guo <gary@garyguo.net> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://patch.msgid.link/20260525202921.124698-5-dakr@kernel.org Signed-off-by: Danilo Krummrich <dakr@kernel.org>
2026-05-26pwm: pca9685: Use named initializers for struct i2c_device_idUwe Kleine-König (The Capable Hub)
While being less compact, using named initializers allows to more easily see which members of the structs are assigned which value without having to lookup the declaration of the struct. And it's also more robust against changes to the struct definition. This patch doesn't modify the compiled arrays, only their representation in source form benefits. The former was confirmed with x86 and arm64 builds. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/20260518172323.932774-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-05-26pwm: pxa: Add optional bus clockYixun Lan
Add one secondary optional bus clock for the PWM PXA driver, also keep it compatible with old single clock. The SpacemiT K3 SoC require a bus clock for PWM controller, acquire and enable it during probe phase. Signed-off-by: Yixun Lan <dlan@kernel.org> Link: https://patch.msgid.link/20260428-03-k3-pwm-drv-v2-2-a532bbe45556@kernel.org Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-05-26pwm: ipq: Add missing module descriptionRosen Penev
Add a MODULE_DESCRIPTION() entry to fix the modpost warning: WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pwm/pwm-ipq.o Assisted-by: Codex:GPT-5.5 Signed-off-by: Rosen Penev <rosenp@gmail.com> Fixes: 728796fc4193 ("pwm: Driver for qualcomm ipq6018 pwm block") Link: https://patch.msgid.link/20260509023609.1007698-1-rosenp@gmail.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-05-26pwm: stm32: Make use of mul_u64_u64_div_u64_roundup()Uwe Kleine-König
When the driver was converted to the waveform API the need for this function arised but at that time this function didn't exist yet. In the meantime it's available, so switch to the global function and drop the driver specific implementation. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/788319f0fff963feca4df3c5fcdd471dcf70ccdf.1776264104.git.u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-05-26pwm: Consistently define pci_device_ids using named initializersUwe Kleine-König (The Capable Hub)
The .driver_data member in the various struct pci_device_id arrays were initialized by list expressions. This isn't easily readable if you're not into PCI. Using named initializers is more explicit and thus easier to parse. The secret plan is to make struct pci_device_id::driver_data an anonymous union (similar to https://lore.kernel.org/all/cover.1776579304.git.u.kleine-koenig@baylibre.com/) and that requires named initializers. But it's also a nice cleanup on its own. This change doesn't introduce changes to the compiled pci_device_id arrays. Tested on x86 and arm64. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/20260504085535.1914668-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-05-26pwm: Driver for qualcomm ipq6018 pwm blockDevi Priya
Driver for the PWM block in Qualcomm IPQ6018 line of SoCs. Based on driver from downstream Codeaurora kernel tree. Removed support for older (V1) variants because I have no access to that hardware. Tested on IPQ5018 and IPQ6010 based hardware. Co-developed-by: Baruch Siach <baruch.siach@siklu.com> Signed-off-by: Baruch Siach <baruch.siach@siklu.com> Signed-off-by: Devi Priya <quic_devipriy@quicinc.com> Reviewed-by: Bjorn Andersson <andersson@kernel.org> Signed-off-by: George Moussalem <george.moussalem@outlook.com> Link: https://patch.msgid.link/20260406-ipq-pwm-v21-2-6ed1e868e4c2@outlook.com [ukleinek: Fixed a few nitpicks as agreed on the mailing list] Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-05-23pwm: imx27: Fix variable truncation in .apply()Ronaldo Nunez
Fix a variable truncation when calculating period in microseconds as part of the solution for the ERR051198 in .apply() callback. Example scenario: - Period of 3us (PWMPR = 196 and prescaler = 1) - Expected value in tmp: 198000000000 (NSEC_PER_SEC * (196 + 2) * 1) - Actual value is 431504384 (truncation to u32) Signed-off-by: Ronaldo Nunez <rnunez@baylibre.com> Reviewed-by: Frank Li <Frank.Li@nxp.com> Link: https://patch.msgid.link/20260522191348.6227-1-rnunez@baylibre.com Fixes: a25351e4c774 ("pwm: imx27: Workaround of the pwm output bug when decrease the duty cycle") Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-05-23pwm: mediatek: correct mt7628 clock source settingShiji Yang
PWMCON register Bit(3) is used to configure whether to pre divide the clock source. Most revisions clear this bit to disable frequency division. However, mt7628 needs to set this bit. Hence, we introduce a new clksel_fixup flag to correctly configure the clock source for mt7628. Signed-off-by: Shiji Yang <yangshiji66@outlook.com> Link: https://patch.msgid.link/OS7PR01MB136020DA816E8D601D5BA8BF4BC74A@OS7PR01MB13602.jpnprd01.prod.outlook.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-05-23pwm: mediatek: set mt7628 pwm45_fixup flag to falseShiji Yang
According to the programing guide, mt7628 has generic register layout like most other hardware revisions. We should not set pwm45_fixup flag for it. Signed-off-by: Shiji Yang <yangshiji66@outlook.com> Link: https://patch.msgid.link/OS7PR01MB13602B3C7E43A2E38275C73AEBC74A@OS7PR01MB13602.jpnprd01.prod.outlook.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-05-18pwm: atmel-tcb: Remove unneeded semicolonChen Ni
Remove unnecessary semicolons reported by Coccinelle/coccicheck and the semantic patch at scripts/coccinelle/misc/semicolon.cocci. This was introduced in commit 68637b68afcc ("pwm: atmel-tcb: Cache clock rates and mark chip as atomic") in Uwe's adaption of Sangyun's original patch. Signed-off-by: Chen Ni <nichen@iscas.ac.cn> Link: https://patch.msgid.link/20260428075329.1234735-1-nichen@iscas.ac.cn Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-04-23Merge tag 'pwm/fixes-7.1-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux Pull pwm fixes from Uwe Kleine-König: "Two driver fixes After having added some more code to libpwm checking the pwm rounding rules for the userspace interface I spotted an issue in the pwm-stm32 driver where in some cases involving inverted polarity the wrong hardware settings for the duty offset are chosen. I think it has little practical effect because the duty offset is in most cases an artificial property of the output waveform. Still it's relevant to get this fixed because this driver serves as a reference implementation for the still young waveform API. The second fix addresses a sleep-in-atomic issue in the pwm-atmel-tcb driver" * tag 'pwm/fixes-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux: pwm: atmel-tcb: Cache clock rates and mark chip as atomic pwm: stm32: Fix rounding issue for requests with inverted polarity
2026-04-22pwm: atmel-tcb: Cache clock rates and mark chip as atomicSangyun Kim
atmel_tcb_pwm_apply() holds tcbpwmc->lock as a spinlock via guard(spinlock)() and then calls atmel_tcb_pwm_config(), which calls clk_get_rate() twice. clk_get_rate() acquires clk_prepare_lock (a mutex), so this is a sleep-in-atomic-context violation. On CONFIG_DEBUG_ATOMIC_SLEEP kernels every pwm_apply_state() that enables or reconfigures the PWM triggers a "BUG: sleeping function called from invalid context" warning. Acquire exclusive control over the clock rates with clk_rate_exclusive_get() at probe time and cache the rates in struct atmel_tcb_pwm_chip, then read the cached rates from atmel_tcb_pwm_config(). This keeps the spinlock-based mutual exclusion introduced in commit 37f7707077f5 ("pwm: atmel-tcb: Fix race condition and convert to guards") and removes the sleeping calls from the atomic section. With no sleeping calls left in .apply() and the regmap-mmio bus already running with fast_io=true, also mark the chip as atomic so consumers can use pwm_apply_atomic() from atomic context. Fixes: 37f7707077f5 ("pwm: atmel-tcb: Fix race condition and convert to guards") Signed-off-by: Sangyun Kim <sangyun.kim@snu.ac.kr> Link: https://patch.msgid.link/20260419080838.3192357-1-sangyun.kim@snu.ac.kr [ukleinek: Ensure .clk is enabled before calling clk_get_rate on it.] Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-04-16pwm: stm32: Fix rounding issue for requests with inverted polarityUwe Kleine-König
The calculation of the number of pwm clk ticks from a time length in nanoseconds involves a division and thus some rounding. That might result in duty_ticks + offset_ticks < period_ticks despite duty_length_ns + duty_offset_ns >= period_length_ns . The stm32 PWM cannot configure offset_ticks freely, it can only select 0 or period_length_ns - duty_length_ns---that is the classic normal and inverted polarity. The decision to select the hardware polarity must be done using the ticks values and not the nanoseconds times to adhere to the rounding rules by the pwm core. With the pwm clk running at 208900 kHz on my test machine (stm32mp135f-dk), a test case that was handled wrong is: # pwmround -P 9999962 -O 24970 -D 9974992 period_length = 9999962 duty_length = 9974840 duty_offset = 25123 With this change applied the rounding is done correctly: # pwmround -P 9999962 -O 24970 -D 9974992 period_length = 9999962 duty_length = 9974840 duty_offset = 0 Fixes: deaba9cff809 ("pwm: stm32: Implementation of the waveform callbacks") Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/c5e7767cee821b5f6e00f95bd14a5e13015646fb.1776264104.git.u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-04-15Merge tag 'pwm/for-7.1-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux Pull pwm updates from Uwe Kleine-König: "Just two minor fixes, a device tree binding addition to support a few more SoCs (without the need for driver adaptions), a driver include cleanup and the addition of the #linux-pwm irc channel to MAINTAINERS" * tag 'pwm/for-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux: pwm: th1520: fix `CLIPPY=1` warning pwm: jz4740: Drop unused include MAINTAINERS: Add #linux-pwm irc channel to pwm entry dt-bindings: pwm: amlogic: Document A4 A5 and T7 PWM pwm: imx-tpm: Count the number of enabled channels in probe
2026-04-03pwm: th1520: remove impl Send/Sync for Th1520PwmDriverDataAlice Ryhl
Now that clk implements Send and Sync, we no longer need to manually implement these traits for Th1520PwmDriverData. Thus remove the implementations. Reviewed-by: Gary Guo <gary@garyguo.net> Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com> Acked-by: Uwe Kleine-König <ukleinek@kernel.org> Reviewed-by: Michal Wilczynski <m.wilczynski@samsung.com> Signed-off-by: Alice Ryhl <aliceryhl@google.com> Link: https://patch.msgid.link/20260223-clk-send-sync-v5-3-181bf2f35652@google.com Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-03-29pwm: th1520: fix `CLIPPY=1` warningMiguel Ojeda
The Rust kernel code should be kept `CLIPPY=1`-clean [1]. Clippy reports: error: this pattern reimplements `Option::unwrap_or` --> drivers/pwm/pwm_th1520.rs:64:5 | 64 | / (match ns.checked_mul(rate_hz) { 65 | | Some(product) => product, 66 | | None => u64::MAX, 67 | | }) / NSEC_PER_SEC_U64 | |______^ help: replace with: `ns.checked_mul(rate_hz).unwrap_or(u64::MAX)` | = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#manual_unwrap_or = note: `-D clippy::manual-unwrap-or` implied by `-D warnings` = help: to override `-D warnings` add `#[allow(clippy::manual_unwrap_or)]` Applying the suggestion then triggers: error: manual saturating arithmetic --> drivers/pwm/pwm_th1520.rs:64:5 | 64 | ns.checked_mul(rate_hz).unwrap_or(u64::MAX) / NSEC_PER_SEC_U64 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `saturating_mul`: `ns.saturating_mul(rate_hz)` | = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#manual_saturating_arithmetic = note: `-D clippy::manual-saturating-arithmetic` implied by `-D warnings` = help: to override `-D warnings` add `#[allow(clippy::manual_saturating_arithmetic)]` Thus fix it by using saturating arithmetic, which simplifies the code as well. Link: https://rust-for-linux.com/contributing#submit-checklist-addendum [1] Fixes: e03724aac758 ("pwm: Add Rust driver for T-HEAD TH1520 SoC") Signed-off-by: Miguel Ojeda <ojeda@kernel.org> Reviewed-by: Danilo Krummrich <dakr@kernel.org> Reviewed-by: Michal Wilczynski <m.wilczynski@samsung.com> Link: https://patch.msgid.link/20260121183719.71659-1-ojeda@kernel.org Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-03-21pwm: jz4740: Drop unused includeAndy Shevchenko
This driver includes the legacy header <linux/gpio.h> but does not use any symbols from it. Drop the inclusion. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Paul Cercueil <paul@crapouillou.net> Link: https://patch.msgid.link/20260320220644.3237290-1-andriy.shevchenko@linux.intel.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-03-13pwm: imx-tpm: Count the number of enabled channels in probeViorel Suman (OSS)
On a soft reset TPM PWM IP may preserve its internal state from previous runtime, therefore on a subsequent OS boot and driver probe "enable_count" value and TPM PWM IP internal channels "enabled" states may get unaligned. In consequence on a suspend/resume cycle the call "if (--tpm->enable_count == 0)" may lead to "enable_count" overflow the system being blocked from entering suspend due to: if (tpm->enable_count > 0) return -EBUSY; Fix the problem by counting the enabled channels in probe function. Signed-off-by: Viorel Suman (OSS) <viorel.suman@oss.nxp.com> Fixes: 738a1cfec2ed ("pwm: Add i.MX TPM PWM driver support") Link: https://patch.msgid.link/20260311123309.348904-1-viorel.suman@oss.nxp.com Cc: stable@vger.kernel.org Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-02-21Convert 'alloc_flex' family to use the new default GFP_KERNEL argumentLinus Torvalds
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 <torvalds@linux-foundation.org>
2026-02-21Convert 'alloc_obj' family to use the new default GFP_KERNEL argumentLinus Torvalds
This was done entirely with mindless brute force, using git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' | xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/' to convert the new alloc_obj() users that had a simple GFP_KERNEL argument to just drop that argument. Note that due to the extreme simplicity of the scripting, any slightly more complex cases spread over multiple lines would not be triggered: they definitely exist, but this covers the vast bulk of the cases, and the resulting diff is also then easier to check automatically. For the same reason the 'flex' versions will be done as a separate conversion. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2026-02-21treewide: Replace kmalloc with kmalloc_obj for non-scalar typesKees Cook
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 <kees@kernel.org>
2026-02-11Merge tag 'driver-core-7.0-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core Pull driver core updates from Danilo Krummrich: "Bus: - Ensure bus->match() is consistently called with the device lock held - Improve type safety of bus_find_device_by_acpi_dev() Devtmpfs: - Parse 'devtmpfs.mount=' boot parameter with kstrtoint() instead of simple_strtoul() - Avoid sparse warning by making devtmpfs_context_ops static IOMMU: - Do not register the qcom_smmu_tbu_driver in arm_smmu_device_probe() MAINTAINERS: - Add the new driver-core mailing list (driver-core@lists.linux.dev) to all relevant entries - Add missing tree location for "FIRMWARE LOADER (request_firmware)" - Add driver-model documentation to the "DRIVER CORE" entry - Add missing driver-core maintainers to the "AUXILIARY BUS" entry Misc: - Change return type of attribute_container_register() to void; it has always been infallible - Do not export sysfs_change_owner(), sysfs_file_change_owner() and device_change_owner() - Move devres_for_each_res() from the public devres header to drivers/base/base.h - Do not use a static struct device for the faux bus; allocate it dynamically Revocable: - Patches for the revocable synchronization primitive have been scheduled for v7.0-rc1, but have been reverted as they need some more refinement Rust: - Device: - Support dev_printk on all device types, not just the core Device struct; remove now-redundant .as_ref() calls in dev_* print calls - Devres: - Introduce an internal reference count in Devres<T> to avoid a deadlock condition in case of (indirect) nesting - DMA: - Allow drivers to tune the maximum DMA segment size via dma_set_max_seg_size() - I/O: - Introduce the concept of generic I/O backends to handle different kinds of device shared memory through a common interface. This enables higher-level concepts such as register abstractions, I/O slices, and field projections to be built generically on top. In a first step, introduce the Io, IoCapable<T>, and IoKnownSize trait hierarchy for sharing a common interface supporting offset validation and bound-checking logic between I/O backends. - Refactor MMIO to use the common I/O backend infrastructure - Misc: - Add __rust_helper annotations to C helpers for inlining into Rust code - Use "kernel vertical" style for imports - Replace kernel::c_str! with C string literals - Update ARef imports to use sync::aref - Use pin_init::zeroed() for struct auxiliary_device_id and debugfs file_operations initialization - Use LKMM atomic types in debugfs doc-tests - Various minor comment and documentation fixes - PCI: - Implement PCI configuration space accessors using the common I/O backend infrastructure - Document pci::Bar device endianness assumptions - SoC: - Abstractions for struct soc_device and struct soc_device_attribute - Sample driver for soc::Device" * tag 'driver-core-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core: (79 commits) rust: devres: fix race condition due to nesting rust: dma: add missing __rust_helper annotations samples: rust: pci: Remove some additional `.as_ref()` for `dev_*` print Revert "revocable: Revocable resource management" Revert "revocable: Add Kunit test cases" Revert "selftests: revocable: Add kselftest cases" driver core: remove device_change_owner() export sysfs: remove exports of sysfs_*change_owner() driver core: disable revocable code from build revocable: Add KUnit test for concurrent access revocable: fix SRCU index corruption by requiring caller-provided storage revocable: Add KUnit test for provider lifetime races revocable: Fix races in revocable_alloc() using RCU driver core: fix inverted "locked" suffix of driver_match_device() rust: io: move MIN_SIZE and io_addr_assert to IoKnownSize rust: pci: re-export ConfigSpace rust: dma: allow drivers to tune max segment size gpu: tyr: remove redundant `.as_ref()` for `dev_*` print rust: auxiliary: use `pin_init::zeroed()` for device ID rust: debugfs: use pin_init::zeroed() for file_operations ...
2026-01-30pwm: Remove redundant check in pwm_ops_check()Ben Zong-You Xie
ops->write_waveform is already known to be non-NULL so there is no need to check it a second time. The superflous check was introduced in commit 17e40c25158f ("pwm: New abstraction for PWM waveforms"). Signed-off-by: Ben Zong-You Xie <ben717@andestech.com> Link: https://patch.msgid.link/20260129-fix-pwm-ops-check-v1-1-6f0b7952c875@andestech.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-01-26Merge tag 'v6.19-rc7' into driver-core-nextDanilo Krummrich
We need the driver-core fixes in here as well to build on top of. Signed-off-by: Danilo Krummrich <dakr@kernel.org>
2026-01-23rust: io: separate generic I/O helpers from MMIO implementationZhi Wang
The previous Io<SIZE> type combined both the generic I/O access helpers and MMIO implementation details in a single struct. This coupling prevented reusing the I/O helpers for other backends, such as PCI configuration space. Establish a clean separation between the I/O interface and concrete backends by separating generic I/O helpers from MMIO implementation. Introduce a new trait hierarchy to handle different access capabilities: - IoCapable<T>: A marker trait indicating that a backend supports I/O operations of a certain type (u8, u16, u32, or u64). - Io trait: Defines fallible (try_read8, try_write8, etc.) and infallibile (read8, write8, etc.) I/O methods with runtime bounds checking and compile-time bounds checking. - IoKnownSize trait: The marker trait for types support infallible I/O methods. Move the MMIO-specific logic into a dedicated Mmio<SIZE> type that implements the Io traits. Rename IoRaw to MmioRaw and update consumers to use the new types. Cc: Alexandre Courbot <acourbot@nvidia.com> Cc: Alice Ryhl <aliceryhl@google.com> Cc: Bjorn Helgaas <helgaas@kernel.org> Cc: Gary Guo <gary@garyguo.net> Cc: Danilo Krummrich <dakr@kernel.org> Cc: John Hubbard <jhubbard@nvidia.com> Signed-off-by: Zhi Wang <zhiw@nvidia.com> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Reviewed-by: Gary Guo <gary@garyguo.net> Link: https://patch.msgid.link/20260121202212.4438-3-zhiw@nvidia.com [ Add #[expect(unused)] to define_{read,write}!(). - Danilo ] Signed-off-by: Danilo Krummrich <dakr@kernel.org>
2026-01-21pwm: tiehrpwm: Enable pwmchip's parent device before setting configurationGokul Praveen
The period and duty cycle configurations on J7200 and J784S4 SoCs does not get reflected after setting them using sysfs nodes. This is because at the end of ehrpwm_pwm_config function, the put_sync function is called which resets the hardware. Hold the PWM controller out of low-power mode during .apply() to make sure it accepts the writes to its registers. This renders the calls to pm_runtime_get_sync() and pm_runtime_put_sync() in ehrpwm_pwm_config() into no-ops, so these can be dropped. Fixes: 5f027d9b83db ("pwm: tiehrpwm: Implement .apply() callback") Signed-off-by: Gokul Praveen <g-praveen@ti.com> Suggested-by: Uwe Kleine-König <ukleinek@kernel.org> Link: https://patch.msgid.link/20260121061134.15466-1-g-praveen@ti.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-01-20pwm: th1520: Replace `kernel::c_str!` with C-StringsTamir Duberstein
C-String literals were added in Rust 1.77. Replace instances of `kernel::c_str!` with C-String literals where possible. Signed-off-by: Tamir Duberstein <tamird@gmail.com> Reviewed-by: Michal Wilczynski <m.wilczynski@samsung.com> Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com> Link: https://patch.msgid.link/20251222-cstr-pwm-v1-1-e8916d976f8d@gmail.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-01-20pwm: dwc: Use size macroRaag Jadav
Use SZ_4K from linux/sizes.h instead of hardcoding constant. Signed-off-by: Raag Jadav <raag.jadav@intel.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://patch.msgid.link/20260105091737.17280-1-raag.jadav@intel.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-01-20pwm: Emit native configuration in /sys/kernel/debug/pwmUwe Kleine-König
Currently there are two abstractions for PWM drivers. Use the waveform representation for the drivers that support it as this is more expressive and so tells more about the actual hardware state. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/20251121104947.2652013-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-01-20rust: pwm: Add UnregisteredChip wrapper around ChipMarkus Probst
The `pwm::Registration::register` function provides no guarantee that the function isn't called twice with the same pwm chip, which is considered unsafe. Add `pwm::UnregisteredChip` as wrapper around `pwm::Chip`. Implement `pwm::UnregisteredChip::register` for the registration. This function takes ownership of `pwm::UnregisteredChip` and therefore guarantees that the registration can't be called twice on the same pwm chip. Signed-off-by: Markus Probst <markus.probst@posteo.de> Tested-by: Michal Wilczynski <m.wilczynski@samsung.com> Acked-by: Michal Wilczynski <m.wilczynski@samsung.com> Link: https://patch.msgid.link/20251202-pwm_safe_register-v2-1-7a2e0d1e287f@posteo.de [ukleinek: fixes a typo that Michal pointed out during review] Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-01-19pwm: max7360: Populate missing .sizeof_wfhw in max7360_pwm_opsRichard Genoud
The sizeof_wfhw field wasn't populated in max7360_pwm_ops so it was set to 0 by default. While this is ok for now because: sizeof(struct max7360_pwm_waveform) < PWM_WFHWSIZE in the future, if struct max7360_pwm_waveform grows, it could lead to stack corruption. Fixes: d93a75d94b79 ("pwm: max7360: Add MAX7360 PWM support") Signed-off-by: Richard Genoud <richard.genoud@bootlin.com> Link: https://patch.msgid.link/20260113163907.368919-1-richard.genoud@bootlin.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2026-01-19pwm: Ensure ioctl() returns a negative errno on errorUwe Kleine-König
copy_to_user() returns the number of bytes not copied, thus if there is a problem a positive number. However the ioctl callback is supposed to return a negative error code on error. This error is a unfortunate as strictly speaking it became ABI with the introduction of pwm character devices. However I never saw the issue in real life -- I found this by code inspection -- and it only affects an error case where readonly memory is passed to the ioctls or the address mapping changes while the ioctl is active. Also there are already error cases returning negative values, so the calling code must be prepared to see such values already. Fixes: 9c06f26ba5f5 ("pwm: Add support for pwmchip devices for faster and easier userspace access") Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/20260119151325.571857-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2025-12-13Merge tag 'pwm/for-6.19-rc1-fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux Pull pwm fix from Uwe Kleine-König: "Fix missing th1520 Kconfig dependencies This tightens the dependency for the new pwm driver written in Rust to make build bots and obviously also users happy" * tag 'pwm/for-6.19-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux: pwm: th1520: Fix missing Kconfig dependencies
2025-12-10pwm: th1520: Fix missing Kconfig dependenciesMichal Wilczynski
The driver fails to build on configurations lacking COMMON_CLK (missing clk::Clk) or HAS_IOMEM (incomplete `pwm_chip` struct on UML). Add dependencies on ARCH_THEAD and HAS_IOMEM, and add COMMON_CLK to ensure correct compilation and platform targeting. Reported-by: Markus Probst <markus.probst@gmail.com> Closes: https://lore.kernel.org/all/a66b337528d700ae92d7940a04c59206e06a8495.camel@posteo.de/ Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202512020957.PqnHfe7C-lkp@intel.com/ Fixes: e03724aac758 ("pwm: Add Rust driver for T-HEAD TH1520 SoC") Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com> Link: https://patch.msgid.link/20251209-fix_deps_pwm-v1-1-f7ed8bd1bd3d@samsung.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2025-12-05Merge tag 'driver-core-6.19-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core Pull driver core updates from Danilo Krummrich: "Arch Topology: - Move parse_acpi_topology() from arm64 to common code for reuse in RISC-V CPU: - Expose housekeeping CPUs through /sys/devices/system/cpu/housekeeping - Print a newline (or 0x0A) instead of '(null)' reading /sys/devices/system/cpu/nohz_full when nohz_full= is not set debugfs - Remove (broken) 'no-mount' mode - Remove redundant access mode checks in debugfs_get_tree() and debugfs_create_*() functions Devres: - Remove unused devm_free_percpu() helper - Move devm_alloc_percpu() from device.h to devres.h Firmware Loader: - Replace simple_strtol() with kstrtoint() - Do not call cancel_store() when no upload is in progress kernfs: - Increase struct super_block::maxbytes to MAX_LFS_FILESIZE - Fix a missing unwind path in __kernfs_new_node() Misc: - Increase the name size in struct auxiliary_device_id to 40 characters - Replace system_unbound_wq with system_dfl_wq and add WQ_PERCPU to alloc_workqueue() Platform: - Replace ERR_PTR() with IOMEM_ERR_PTR() in platform ioremap functions Rust: - Auxiliary: - Unregister auxiliary device on parent device unbind - Move parent() to impl Device; implement device context aware parent() for Device<Bound> - Illustrate how to safely obtain a driver's device private data when calling from an auxiliary driver into the parant device driver - DebugFs: - Implement support for binary large objects - Device: - Let probe() return the driver's device private data as pinned initializer, i.e. impl PinInit<Self, Error> - Implement safe accessor for a driver's device private data for Device<Bound> (returned reference can't out-live driver binding and guarantees the correct private data type) - Implement AsBusDevice trait, to be used by class device abstractions to derive the bus device type of the parent device - DMA: - Store raw pointer of allocation as NonNull - Use start_ptr() and start_ptr_mut() to inherit correct mutability of self - FS: - Add file::Offset type alias - I2C: - Add abstractions for I2C device / driver infrastructure - Implement abstractions for manual I2C device registrations - I/O: - Use "kernel vertical" style for imports - Define ResourceSize as resource_size_t - Move ResourceSize to top-level I/O module - Add type alias for phys_addr_t - Implement Rust version of read_poll_timeout_atomic() - PCI: - Use "kernel vertical" style for imports - Move I/O and IRQ infrastructure to separate files - Add support for PCI interrupt vectors - Implement TryInto<IrqRequest<'a>> for IrqVector<'a> to convert an IrqVector bound to specific pci::Device into an IrqRequest bound to the same pci::Device's parent Device - Leverage pin_init_scope() to get rid of redundant Result in IRQ methods - PinInit: - Add {pin_}init_scope() to execute code before creating an initializer - Platform: - Leverage pin_init_scope() to get rid of redundant Result in IRQ methods - Timekeeping: - Implement abstraction of udelay() - Uaccess: - Implement read_slice_partial() and read_slice_file() for UserSliceReader - Implement write_slice_partial() and write_slice_file() for UserSliceWriter sysfs: - Prepare the constification of struct attribute" * tag 'driver-core-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core: (75 commits) rust: pci: fix build failure when CONFIG_PCI_MSI is disabled debugfs: Fix default access mode config check debugfs: Remove broken no-mount mode debugfs: Remove redundant access mode checks driver core: Check drivers_autoprobe for all added devices driver core: WQ_PERCPU added to alloc_workqueue users driver core: replace use of system_unbound_wq with system_dfl_wq tick/nohz: Expose housekeeping CPUs in sysfs tick/nohz: avoid showing '(null)' if nohz_full= not set sysfs/cpu: Use DEVICE_ATTR_RO for nohz_full attribute kernfs: fix memory leak of kernfs_iattrs in __kernfs_new_node fs/kernfs: raise sb->maxbytes to MAX_LFS_FILESIZE mod_devicetable: Bump auxiliary_device_id name size sysfs: simplify attribute definition macros samples/kobject: constify 'struct foo_attribute' samples/kobject: add is_visible() callback to attribute group sysfs: attribute_group: enable const variants of is_visible() sysfs: introduce __SYSFS_FUNCTION_ALTERNATIVE() sysfs: transparently handle const pointers in ATTRIBUTE_GROUPS() sysfs: attribute_group: allow registration of const attribute ...
2025-11-27pwm: rzg2l-gpt: Allow checking period_tick cache value only if sibling ↵Biju Das
channel is enabled The rzg2l_gpt_config() tests the rzg2l_gpt->period_tick variable when both channels of a hardware channel are in use. This check is not valid if rzg2l_gpt_config() is called after disabling all the channels, as it tests against the cached value. Hence, allow checking and setting the cached value only if the sibling channel is enabled. While at it, drop else after return statement to fix the check patch warning. Cc: stable@kernel.org Fixes: 061f087f5d0b ("pwm: Add support for RZ/G2L GPT") Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Link: https://patch.msgid.link/20251126104308.142302-1-biju.das.jz@bp.renesas.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2025-11-19pwm: bcm2835: Make sure the channel is enabled after pwm_request()Uwe Kleine-König
The .free callback cleared among others the enable bit PWENx in the control register. When the PWM is requested later again this bit isn't restored but the core assumes the PWM is enabled and thus skips a request to configure the same state as before. To fix that don't touch the hardware configuration in .free(). For symmetry also drop .request() and configure the mode completely in .apply(). Fixes: e5a06dc5ac1f ("pwm: Add BCM2835 PWM driver") Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com> Link: https://patch.msgid.link/20251118174303.1761577-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2025-11-14Merge branch 'pwm/th1520' into pwm/for-nextUwe Kleine-König
2025-11-14pwm: mediatek: Make use of struct_size macroUwe Kleine-König
struct_size provides the size of a struct with a flexible array member. Use that instead of open-coding it (with less checks than the global macro). Reported-by: kernel test robot <lkp@intel.com> Reported-by: Julia Lawall <julia.lawall@inria.fr> Closes: https://lore.kernel.org/r/202510301753.iqGmTwae-lkp@intel.com/ Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/20251030222528.632836-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2025-11-14pwm: mediatek: Remove unneeded semicolonChen Ni
Remove unnecessary semicolons reported by Coccinelle/coccicheck and the semantic patch at scripts/coccinelle/misc/semicolon.cocci. This was introduced in commit 3a4a308c069a ("pwm: mediatek: Convert to waveform API"). Signed-off-by: Chen Ni <nichen@iscas.ac.cn> Link: https://patch.msgid.link/20251105214847.1279520-1-nichen@iscas.ac.cn [ukleinek: Add reference to introducing commit.] Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2025-11-14pwm: airoha: Add support for EN7581 SoCBenjamin Larsson
Introduce driver for PWM module available on EN7581 SoC. Limitations: - Only 8 concurrent waveform generators are available for 8 combinations of duty_cycle and period. Waveform generators are shared between 16 GPIO pins and 17 SIPO GPIO pins. - Supports only normal polarity. - On configuration the currently running period is completed. - Minimum supported period is 4 ms - Maximum supported period is 1s Signed-off-by: Benjamin Larsson <benjamin.larsson@genexis.eu> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Co-developed-by: Christian Marangi <ansuelsmth@gmail.com> Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> Link: https://patch.msgid.link/20251013103408.14724-1-ansuelsmth@gmail.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2025-11-14pwm: mediatek: Convert to waveform APIUwe Kleine-König
Implement the new waveform callbacks which makes the usage of this hardware more flexible and allows to use it via the pwm character device. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/20251013114258.149260-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2025-11-14pwm: max7360: Clean MAX7360 codeMathieu Dubois-Briand
Duty steps computation can never end in values higher than MAX7360_PWM_MAX: remove useless use of min(). Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com> Suggested-by: Uwe Kleine-König <ukleinek@kernel.org> Link: https://patch.msgid.link/20250924-mdb-max7360-pwm-optimize-v1-1-5959eeed20d8@bootlin.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2025-11-14pwm: Use %u to printf unsigned int pwm_chip::npwm and pwm_chip::idUwe Kleine-König
%u is the right conversion specifier to emit an unsigned int value. Fixes: 62099abf67a2 ("pwm: Add debugfs interface") Fixes: 0360a4873372 ("pwm: Mention PWM chip ID in /sys/kernel/debug/pwm") Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/20251006133525.2457171-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
generated by cgit v1.2.3 (git 2.0.4) at 2026-06-24 07:49:41 +0000