linux-toradex.git/drivers/bus, branch master

Merge tag 'char-misc-7.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2026-10-25T01:44:26+00:00

Pull Char/Misc/IIO/others driver updates from Greg KH:
 "Here is the big set of char/misc/android/iio and other small driver
  subsystem patches for 7.4-rc1. Loads of stuff in here, larger than
  normal. Highlights include:

   - removal of the C binder code, the rust version is stable and will
     be used going forward in a few billion devices. Great job by those
     developers

   - loads and loads of IIO driver updates and feature additions

   - speakup driver fixes and updates

   - mhi driver updates

   - mei driver updates

   - xillybus driver fixes

   - comedi driver fixes

   - lots of coresight driver updates

   - Interconnect driver updates

   - nvmem driver updates and fixes

   - slimbus driver updates and fixes

   - spmi driver updates and fixes

   - lots of tiny misc and char driver fixes based on people scanning
     for things

  All of these have been in linux-next for a while with no reported
  issues, other than a merge conflict with one of the rust tree files,
  which should be simple to resolve"

* tag 'char-misc-7.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (446 commits)
  rust_binder: wake epoll on self-work queued to poll thread
  rust_binder: avoid overflow in get_node_debug_info()
  MAINTAINERS: Add Abel as SPMI co-maintainer
  spmi: mtk-pmif: Fix clock reference leak in mtk_spmi_bus_probe()
  iio: adc: qcom-spmi-iadc: Remove regmap R/W wrapper functions
  iio: adc: qcom-spmi-iadc: Migrate to devm_spmi_subdevice_alloc_and_add()
  misc: qcom-coincell: Migrate to devm_spmi_subdevice_alloc_and_add()
  phy: qualcomm: eusb2-repeater: Migrate to devm_spmi_subdevice_alloc_and_add()
  power: reset: qcom-pon: Migrate to devm_spmi_subdevice_alloc_and_add()
  nvmem: qcom-spmi-sdam: Migrate to devm_spmi_subdevice_alloc_and_add()
  spmi: Add helper to get a parent SPMI device
  spmi: Implement spmi_subdevice_alloc_and_add() and devm variant
  spmi: Remove unneeded goto in spmi_device_add() error path
  spmi: Print error status with %pe format
  spmi: Remove redundant dev_name() print in spmi_device_add()
  spmi: Fix potential use-after-free by grabbing of_node reference
  spmi: mtk-pmif: Add workaround for FSM lockup/error in read operation
  MAINTAINERS: Add Qualcomm SPMI controller entry
  spmi: pmic-arb: return 0 in spmi_pmic_arb_register_buses() on success
  comedi: addi_apci_3xxx: fix subdevice count underallocation
  ...

Merge tag 'soc_fsl-7.4-1' of https://git.kernel.org/pub/scm/linux/kernel/git/chleroy/linux into soc/drivers

2026-10-13T15:08:33+00:00

FSL SOC Changes for 7.4

Freescale QUICC Engine:
- Fix sparse warnings in GPIO
- Drop GPIOD_FLAGS_BIT_NONEXCLUSIVE

Freescale CPM1 Timeslot Assigner:
- Fix clock leak in tsa_of_parse_tdms()

Data Path I/O:
- Free the IRQ before releasing the I/O object
- Fix cleanup on IRQ registration failure

Freescale Management Complex:
- Annotate fsl_mc_io.portal_virt_addr with __counted_by_ptr
- Drop the fwnode links of the dpmacs nodes
- Register the object drivers after misc_class exists
- Set dma_mask for the DPRC devices
- Fix repeated word 'for' in comment

* tag 'soc_fsl-7.4-1' of https://git.kernel.org/pub/scm/linux/kernel/git/chleroy/linux:
  soc: fsl: dpio: Free the IRQ before releasing the I/O object
  soc: fsl: dpio: Fix cleanup on IRQ registration failure
  bus: fsl-mc: Annotate fsl_mc_io.portal_virt_addr with __counted_by_ptr
  bus: fsl-mc: drop the fwnode links of the dpmacs nodes
  soc: fsl: cpm1: tsa: Fix clock leak in tsa_of_parse_tdms()
  soc: fsl: qe: drop GPIOD_FLAGS_BIT_NONEXCLUSIVE
  bus: fsl-mc: register the object drivers after misc_class exists
  bus: fsl-mc: set dma_mask for the DPRC devices
  bus: fsl-mc: fix repeated word 'for' in comment
  soc: fsl: qe: Fix sparse warnings in GPIO

Signed-off-by: Arnd Bergmann

bus: arm-cci: Drop cci-control-port node reference in __cci_ace_get_port()

2026-10-13T14:36:25+00:00

__cci_ace_get_port() looks up the device's "cci-control-port" node with
of_parse_phandle(), which returns the node with its reference count
raised, and only compares the pointer against the probed ports.  Neither
the match nor the no-match return releases it.

Drop the reference on both paths once the comparison is done.

Fixes: ed69bdd8fd9b ("drivers: bus: add ARM CCI support")
Signed-off-by: Yuho Choi 
Link: https://lore.kernel.org/r/20260923164122.596910-1-oss.patchbox@gmail.com
Signed-off-by: Arnd Bergmann

bus: arm-cci: Drop CPU node reference in cci_ace_init_ports()

2026-10-13T14:36:15+00:00

cci_ace_init_ports() looks up each possible CPU's node with
of_get_cpu_node(), which returns the node with its reference count
raised, but never releases it: neither when the CPU has no ACE port nor
after the port has been recorded.  Before the commit below the loop used
for_each_child_of_node(), which manages the references itself.

The node is only needed for the port lookup, so drop the reference right
after __cci_ace_get_port().

Fixes: 78b4d6e0fd26 ("drivers/bus: arm-cci: avoid parsing DT for cpu device nodes")
Signed-off-by: Yuho Choi 
Link: https://lore.kernel.org/r/20260923163536.596107-1-oss.patchbox@gmail.com
Signed-off-by: Arnd Bergmann

bus: mhi: ep: clients: Add loopback driver for data path testing

2026-10-11T16:22:48+00:00

When an MHI endpoint device runs Linux, there is no firmware to implement
the LOOPBACK channel echo that real modem firmware provides. Without an
endpoint-side driver, the host loopback test has no software echo partner
and cannot exercise the full end-to-end MHI data path.

Add an endpoint-side loopback driver that binds to the LOOPBACK channel and
echoes received data back to the host. An ordered workqueue is used for
asynchronous processing to preserve packet ordering. Together with the
host-side loopback driver, this enables complete MHI data path validation
for Linux-based endpoint devices.

Co-developed-by: Krishna Chaitanya Chundru 
Signed-off-by: Krishna Chaitanya Chundru 
Signed-off-by: Sumit Kumar 
Link: https://patch.msgid.link/20261005-lb-v7-3-36a268b6386f@oss.qualcomm.com
[mani: fixed checkpatch warnings]
Signed-off-by: Manivannan Sadhasivam

bus: mhi: ep: Add mhi_ep_queue_buf() API for raw buffer queuing

2026-10-11T16:22:26+00:00

Some MHI endpoint clients do not use socket buffers and need a way to queue
raw buffers for DL transfers. Add mhi_ep_queue_buf() to support this use
case.

Refactor mhi_ep_queue_skb() to delegate to a new internal mhi_ep_queue()
helper shared by both APIs, and rename mhi_ep_skb_completion() to
mhi_ep_buf_completion() to reflect its broader use.

Signed-off-by: Sumit Kumar 
Link: https://patch.msgid.link/20261005-lb-v7-2-36a268b6386f@oss.qualcomm.com
Signed-off-by: Manivannan Sadhasivam

bus: mhi: host: clients: Add loopback driver with sysfs interface

2026-10-11T16:22:20+00:00

The MHI specification defines a LOOPBACK channel. The endpoint firmware
echoes back whatever the host sends on this channel. Without a host-side
driver, there is no way to exercise this channel to validate MHI data path
integrity between host and endpoint.

Add a host-side loopback driver that binds to the LOOPBACK channel and
expose a sysfs interface for data path testing. The sysfs interface allows
users to configure TRE buffer size and count, trigger a loopback test, and
read the result.

The new sysfs ABI is documented under Documentation/ABI/testing/, not
stable/, since this is a new interface without established API
guarantees yet. It is unrelated to the existing stable MHI sysfs ABI
documented in Documentation/ABI/stable/sysfs-bus-mhi, despite both
being covered by the same MAINTAINERS entry.

Co-developed-by: Krishna Chaitanya Chundru 
Signed-off-by: Krishna Chaitanya Chundru 
Signed-off-by: Sumit Kumar 
Link: https://patch.msgid.link/20261005-lb-v7-1-36a268b6386f@oss.qualcomm.com
Signed-off-by: Manivannan Sadhasivam

bus: mhi: host: pci_generic: Add Quectel RM500Q-AE support

2026-10-11T16:22:07+00:00

The Quectel RM500Q-AE (SDX55) enumerates with the Qualcomm SDX55 ID
17cb:0306 and subsystem ID 17cb:5002, so it binds to the generic
qcom-sdx55m entry. That configuration expects QMI on channels 14/15,
which this module's firmware does not answer: the modem probes, but
every QMI request over the control channel times out and no data
session can be set up. Users of this module have had to fall back to
Quectel's out-of-tree driver.

Like the other Quectel modules, the RM500Q-AE provides MBIM control on
channels 12/13 and data on IP_HW0_MBIM. Add an entry for its subsystem
ID, which no other entry in the table uses, that reuses the Quectel
em1xx channel configuration. The EDL image name is the one the generic
SDX55 entry already uses.

Tested on a Xunison Exigo D50 5G (IPQ5018) with modem firmware
RM500QAEAAR13A03M4G: the modem probes as quectel-rm500q and exposes
wwan0mbim0, wwan0at0 and an MBIM network device. A data session set up
with mbimcli and with OpenWrt's umbim reached 160-180 Mbps, the
limit of the cell.

Assisted-by: LLM
Signed-off-by: Steve Meek 
Link: https://patch.msgid.link/20261011-mhi-next-v1-1-13a738637ff0@gmail.com
Signed-off-by: Manivannan Sadhasivam

bus: fsl-mc: drop the fwnode links of the dpmacs nodes

2026-10-09T08:15:19+00:00

A DPMAC node under dpmacs/ is never the fwnode of any device:
  the fsl-mc bus creates dpmac.N objects without one,
  then dpaa2-mac finds its node in dpmacs/ at connect time.

fw_devlink therefore attaches the supplier links of those nodes (phys, ...)
to the nearest ancestor device, the fsl-mc bus, as SYNC_STATE_ONLY proxies.

device_link_add() refuses such a link once the consumer has probed, and
fw_devlink logs the refusal as an error.

On an LX2160A board with 4x25G DPMACs for which phys = <&serdes_1 N>,
the Serdes PHY binds after the bus and then at every boot it shows:

  fsl_mc_bus 80c000000.fsl-mc: Failed to create device link (0x180) with supplier 1ea0000.phy for /soc/fsl-mc@80c000000/dpmacs/ethernet@3

once per port!

To fix it, when the root MC bus probes, purge the fwnode links of every
child of its dpmacs node, so fw_devlink has no supplier link left to
proxy to the bus and no longer tries to create those device links.

Signed-off-by: Vincent Jardin 
Reviewed-by: Ioana Ciornei 
Tested-by: Ioana Ciornei  # LX2160ARDB
Link: https://lore.kernel.org/r/20260930-for-upstream-fsl-mc-dpmac-fwnode-links-v2-1-13f7b6ef000f@free.fr
Signed-off-by: Christophe Leroy (CS GROUP)

bus: mhi: host: pci_generic: Add DUN channel configuration

2026-09-26T11:39:39+00:00

Add the DUN uplink (ch32) and downlink (ch33) channel definitions to
the Qualcomm modem MHI channel configuration table.
 
These channels are used for transporting AT commands over MHI.
Defining them allows the MHI core to create the corresponding DUN MHI
devices and enables userspace access to the modem AT interface through
the MHI WWAN client driver.

Signed-off-by: Krishna Chaitanya Chundru 
Signed-off-by: Manivannan Sadhasivam 
Link: https://patch.msgid.link/20260925-mhi_dun-v1-1-65bc07ec8a59@oss.qualcomm.com