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

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
  ...

1 files changed, 49 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-mhi-devices-loopback b/Documentation/ABI/testing/sysfs-bus-mhi-devices-loopback
new file mode 100644
index 000000000000..5435e65ef056
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-mhi-devices-loopback
@@ -0,0 +1,49 @@
+What:		/sys/bus/mhi/devices/mhi<N>_LOOPBACK/tre_size
+Date:		August 2026
+KernelVersion:	7.4
+Contact:	mhi@lists.linux.dev
+Description:
+		(RW) Size of each Transfer Ring Element (TRE) buffer in bytes
+		used for the loopback test. Valid range is 1 to the value
+		reported by max_tre_size. Default value is 32 bytes.
+
+What:		/sys/bus/mhi/devices/mhi<N>_LOOPBACK/max_tre_size
+Date:		August 2026
+KernelVersion:	7.4
+Contact:	mhi@lists.linux.dev
+Description:
+		(RO) Maximum allowed Transfer Ring Element (TRE) size in bytes.
+		Reading this file returns the upper bound for the tre_size
+		attribute.
+
+What:		/sys/bus/mhi/devices/mhi<N>_LOOPBACK/num_tre
+Date:		August 2026
+KernelVersion:	7.4
+Contact:	mhi@lists.linux.dev
+Description:
+		(RW) Number of Transfer Ring Elements (TREs) to use per
+		loopback test. Must be greater than zero and must not exceed
+		the value reported by max_num_tre. Default value is 1.
+
+What:		/sys/bus/mhi/devices/mhi<N>_LOOPBACK/max_num_tre
+Date:		August 2026
+KernelVersion:	7.4
+Contact:	mhi@lists.linux.dev
+Description:
+		(RO) Maximum number of Transfer Ring Elements (TREs) currently
+		available on the channel ring. Reading this file returns the
+		upper bound for the num_tre attribute.
+
+What:		/sys/bus/mhi/devices/mhi<N>_LOOPBACK/start
+Date:		August 2026
+KernelVersion:	7.4
+Contact:	mhi@lists.linux.dev
+Description:
+		(WO) Write any value to trigger a loopback test. The driver
+		sends random data to the endpoint using the configured tre_size
+		and num_tre parameters, waits for the endpoint to echo it back,
+		and verifies the received data matches what was sent.
+
+		This is a blocking write that returns when the test completes
+		or times out after 5 seconds. The write returns an error code
+		if the test fails or times out.