kernel/linux.git/drivers/pwm, branch v6.19.11

pwm: tiehrpwm: Enable pwmchip's parent device before setting configuration

2026-02-26T23:01:01+00:00

[ Upstream commit 75e7ed52ac7c1da90f304dcda2906636404df921 ] 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 Suggested-by: Uwe Kleine-König Link: https://patch.msgid.link/20260121061134.15466-1-g-praveen@ti.com Signed-off-by: Uwe Kleine-König Signed-off-by: Sasha Levin

pwm: max7360: Populate missing .sizeof_wfhw in max7360_pwm_ops

2026-01-19T17:31:05+00:00

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 Link: https://patch.msgid.link/20260113163907.368919-1-richard.genoud@bootlin.com Signed-off-by: Uwe Kleine-König

pwm: Ensure ioctl() returns a negative errno on error

2026-01-19T16:46:51+00:00

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 Link: https://patch.msgid.link/20260119151325.571857-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König

Merge tag 'pwm/for-6.19-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux

2025-12-13T04:41:50+00:00

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

pwm: th1520: Fix missing Kconfig dependencies

2025-12-10T07:14:27+00:00

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 Closes: https://lore.kernel.org/all/a66b337528d700ae92d7940a04c59206e06a8495.camel@posteo.de/ Reported-by: kernel test robot 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 Link: https://patch.msgid.link/20251209-fix_deps_pwm-v1-1-f7ed8bd1bd3d@samsung.com Signed-off-by: Uwe Kleine-König

Merge tag 'driver-core-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core

2025-12-06T05:29:02+00:00

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 - 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 - Implement safe accessor for a driver's device private data for Device (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> 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 ...

pwm: rzg2l-gpt: Allow checking period_tick cache value only if sibling channel is enabled

2025-11-27T08:58:07+00:00

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 Link: https://patch.msgid.link/20251126104308.142302-1-biju.das.jz@bp.renesas.com Signed-off-by: Uwe Kleine-König

pwm: bcm2835: Make sure the channel is enabled after pwm_request()

2025-11-19T10:41:00+00:00

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 Reviewed-by: Florian Fainelli Link: https://patch.msgid.link/20251118174303.1761577-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König

Merge branch 'pwm/th1520' into pwm/for-next

2025-11-14T10:56:14+00:00

pwm: mediatek: Make use of struct_size macro

2025-11-14T10:56:14+00:00

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 Reported-by: Julia Lawall Closes: https://lore.kernel.org/r/202510301753.iqGmTwae-lkp@intel.com/ Signed-off-by: Uwe Kleine-König Link: https://patch.msgid.link/20251030222528.632836-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König