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| author | Peter Rosin <peda@axentia.se> | 2017-05-14 21:51:06 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-03 12:29:26 +0200 |
| commit | a3b02a9c6591ce154cd44e2383406390a45b530c (patch) | |
| tree | d6d0547b25d3117c103370ee24020cfd6cced3fe /Documentation | |
| parent | dt-bindings: document devicetree bindings for mux-controllers and gpio-mux (diff) | |
| download | linux-a3b02a9c6591ce154cd44e2383406390a45b530c.tar.xz linux-a3b02a9c6591ce154cd44e2383406390a45b530c.zip | |
mux: minimal mux subsystem
Add a new minimalistic subsystem that handles multiplexer controllers.
When multiplexers are used in various places in the kernel, and the
same multiplexer controller can be used for several independent things,
there should be one place to implement support for said multiplexer
controller.
A single multiplexer controller can also be used to control several
parallel multiplexers, that are in turn used by different subsystems
in the kernel, leading to a need to coordinate multiplexer accesses.
The multiplexer subsystem handles this coordination.
Thanks go out to Lars-Peter Clausen, Jonathan Cameron, Rob Herring,
Wolfram Sang, Paul Gortmaker, Dan Carpenter, Colin Ian King, Greg
Kroah-Hartman and last but certainly not least to Philipp Zabel for
helpful comments, reviews, patches and general encouragement!
Reviewed-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-mux | 16 | ||||
| -rw-r--r-- | Documentation/driver-model/devres.txt | 5 |
2 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-mux b/Documentation/ABI/testing/sysfs-class-mux new file mode 100644 index 000000000000..8715f9c7bd4f --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-mux @@ -0,0 +1,16 @@ +What: /sys/class/mux/ +Date: April 2017 +KernelVersion: 4.13 +Contact: Peter Rosin <peda@axentia.se> +Description: + The mux/ class sub-directory belongs to the Generic MUX + Framework and provides a sysfs interface for using MUX + controllers. + +What: /sys/class/mux/muxchipN/ +Date: April 2017 +KernelVersion: 4.13 +Contact: Peter Rosin <peda@axentia.se> +Description: + A /sys/class/mux/muxchipN directory is created for each + probed MUX chip where N is a simple enumeration. diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt index af08b4cd7968..40e4787c399c 100644 --- a/Documentation/driver-model/devres.txt +++ b/Documentation/driver-model/devres.txt @@ -337,6 +337,11 @@ MEM MFD devm_mfd_add_devices() +MUX + devm_mux_chip_alloc() + devm_mux_chip_register() + devm_mux_control_get() + PER-CPU MEM devm_alloc_percpu() devm_free_percpu() |