kernel/linux.git/drivers/power/sequencing, branch master

Merge tag 'pwrseq-updates-for-v7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

2026-04-14T03:28:22+00:00

Pull power sequencing updates from Bartosz Golaszewski: "For this release we have an extension of the pwrseq-pcie-m2 driver with support for PCIe M.2 Key E connectors. The rest of the commits fulfill a supporting role: document the hardware in DT bindings, provide required serdev helpers (this has been provided in an immutable branch to Rob Herring so you may see it in his PR as well) and is followed up by some Kconfig fixes from Arnd. Summary: - add support for the PCIe M.2 Key E connectors in pwrseq-pcie-m2 - describe PCIe M.2 Mechanical Key E connectors in DT bindings - add serdev helpers for looking up devices by OF nodes - minor serdev core rework to enable support for PCIe M.2 Key E connectors" * tag 'pwrseq-updates-for-v7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux: power: sequencing: pcie-m2: add SERIAL_DEV_BUS dependency power: sequencing: pcie-m2: enforce PCI and OF dependencies power: sequencing: pcie-m2: Create serdev device for WCN7850 bluetooth power: sequencing: pcie-m2: Add support for PCIe M.2 Key E connectors dt-bindings: connector: Add PCIe M.2 Mechanical Key E connector dt-bindings: serial: Document the graph port serdev: Do not return -ENODEV from of_serdev_register_devices() if external connector is used serdev: Add an API to find the serdev controller associated with the devicetree node serdev: Convert to_serdev_*() helpers to macros and use container_of_const()

power: sequencing: pcie-m2: add SERIAL_DEV_BUS dependency

2026-04-03T12:20:36+00:00

The newly added serdev code fails to link when serdev is turned off: arm-linux-gnueabi-ld: drivers/power/sequencing/pwrseq-pcie-m2.o: in function `pwrseq_pcie_m2_remove_serdev': pwrseq-pcie-m2.c:(.text+0xc8): undefined reference to `serdev_device_remove' arm-linux-gnueabi-ld: drivers/power/sequencing/pwrseq-pcie-m2.o: in function `pwrseq_m2_pcie_notify': pwrseq-pcie-m2.c:(.text+0x69c): undefined reference to `of_find_serdev_controller_by_node' arm-linux-gnueabi-ld: pwrseq-pcie-m2.c:(.text+0x6f8): undefined reference to `serdev_device_alloc' arm-linux-gnueabi-ld: pwrseq-pcie-m2.c:(.text+0x724): undefined reference to `serdev_device_add' Add another Kconfig dependency for this Fixes: 3f736aecbdc8 ("power: sequencing: pcie-m2: Create serdev device for WCN7850 bluetooth") Signed-off-by: Arnd Bergmann Link: https://patch.msgid.link/20260401191030.948046-1-arnd@kernel.org Signed-off-by: Bartosz Golaszewski

power: sequencing: pcie-m2: enforce PCI and OF dependencies

2026-04-03T12:20:10+00:00

The driver fails to build when PCI is disabled: drivers/power/sequencing/pwrseq-pcie-m2.c: In function 'pwrseq_pcie_m2_register_notifier': drivers/power/sequencing/pwrseq-pcie-m2.c:368:54: error: 'pci_bus_type' undeclared (first use in this function); did you mean 'pci_pcie_type'? 368 | ret = bus_register_notifier(&pci_bus_type, &ctx->nb); | ^~~~~~~~~~~~ | pci_pcie_type Similarly, when CONFIG_OF is disabled: drivers/power/sequencing/pwrseq-pcie-m2.c: In function 'pwrseq_m2_pcie_create_bt_node': drivers/power/sequencing/pwrseq-pcie-m2.c:191:9: error: implicit declaration of function 'of_changeset_init' [-Wimplicit-function-declaration] 191 | of_changeset_init(ctx->ocs); | ^~~~~~~~~~~~~~~~~ Make both dependencies unconditional to prevent compile-testing in either configuration. Fixes: 3f736aecbdc8 ("power: sequencing: pcie-m2: Create serdev device for WCN7850 bluetooth") Signed-off-by: Arnd Bergmann Reviewed-by: Ulf Hansson Link: https://patch.msgid.link/20260401091847.305294-1-arnd@kernel.org Signed-off-by: Bartosz Golaszewski

power: sequencing: pcie-m2: Create serdev device for WCN7850 bluetooth

2026-03-31T07:48:44+00:00

For supporting bluetooth over the non-discoverable UART interface of WCN7850, create the serdev device after enumerating the PCIe interface. This is mandatory since the device ID is only known after the PCIe enumeration and the ID is used for creating the serdev device. Since by default there is no OF or ACPI node for the created serdev, create a dynamic OF 'bluetooth' node with the 'compatible' property and attach it to the serdev device. This will allow the serdev device to bind to the existing bluetooth driver. Tested-by: Hans de Goede # ThinkPad T14s gen6 (arm64) Signed-off-by: Manivannan Sadhasivam Link: https://patch.msgid.link/20260326-pci-m2-e-v7-8-43324a7866e6@oss.qualcomm.com Signed-off-by: Bartosz Golaszewski

power: sequencing: pcie-m2: Add support for PCIe M.2 Key E connectors

2026-03-31T07:48:44+00:00

Add support for handling the power sequence of the PCIe M.2 Key E connectors. These connectors are used to attach the Wireless Connectivity devices to the host machine including combinations of WiFi, BT, NFC using interfaces such as PCIe/SDIO for WiFi, USB/UART for BT and I2C for NFC. Currently, this driver supports only the PCIe interface for WiFi and UART interface for BT. The driver also only supports driving the 3.3v/1.8v power supplies and W_DISABLE{1/2}# GPIOs. The optional signals of the Key E connectors are not currently supported. Tested-by: Hans de Goede # ThinkPad T14s gen6 (arm64) Signed-off-by: Manivannan Sadhasivam Link: https://patch.msgid.link/20260326-pci-m2-e-v7-7-43324a7866e6@oss.qualcomm.com Signed-off-by: Bartosz Golaszewski

power: sequencing: pcie-m2: Fix device node reference leak in probe

2026-03-04T08:16:41+00:00

In pwrseq_pcie_m2_probe(), ctx->of_node acquires an explicit reference to the device node using of_node_get(), but there is no corresponding of_node_put() in the driver's error handling paths or removal. Since the ctx is tied to the lifecycle of the platform device, there is no need to hold an additional reference to the device's own of_node. Fixes: 52e7b5bd62ba ("power: sequencing: Add the Power Sequencing driver for the PCIe M.2 connectors") Signed-off-by: Felix Gu Link: https://patch.msgid.link/20260302-m2-v1-1-a6533e18aa69@gmail.com Signed-off-by: Bartosz Golaszewski

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

power: sequencing: qcom-wcn: fix error path for VDDIO handling

2026-02-09T09:32:27+00:00

In case getting VDDIO regulator returned an error, WCN power sequencing driver passes ret to dev_err_probe() as the error code, however it is known that ret is 0 at this point. Pass PTR_ERR(ctx->vddio) instead. Fixes: 0eb85f468ef5 ("power: sequencing: qcom-wcn: add support for WCN39xx") Reported-by: Dan Carpenter Closes: https://lore.kernel.org/r/aYXvQxKqmjP_sdCd@stanley.mountain/ Signed-off-by: Dmitry Baryshkov Link: https://patch.msgid.link/20260207-fix-wcn39xx-v1-1-df0606108ce2@oss.qualcomm.com Signed-off-by: Bartosz Golaszewski

power: sequencing: fix missing state_lock in pwrseq_power_on() error path

2026-02-04T10:26:14+00:00

pwrseq_power_on() calls pwrseq_unit_disable() when the post_enable callback fails. However, this call is outside the scoped_guard(mutex, &pwrseq->state_lock) block that ends. pwrseq_unit_disable() has lockdep_assert_held(&pwrseq->state_lock), which will fail when called from this error path. Add the scoped_guard block to cover the post_enable callback and its error handling to ensure the lock is held when pwrseq_unit_disable() is called. Signed-off-by: Ziyi Guo Link: https://patch.msgid.link/20260130182651.1576579-1-n7l8m4@u.northwestern.edu Signed-off-by: Bartosz Golaszewski