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Commit a3b02a9c authored May 14, 2017 by Peter Rosin Committed by Greg Kroah-Hartman Jun 03, 2017

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>

parent 256ac037

Documentation/ABI/testing/sysfs-class-mux

0 → 100644

+16 −0

Original line number	Diff line number	Diff line
		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.

Documentation/driver-model/devres.txt

+5 −0

Original line number	Diff line number	Diff line
		@@ -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()

MAINTAINERS

+3 −0

Original line number	Diff line number	Diff line
		@@ -8719,8 +8719,11 @@ F: include/linux/spi/mmc_spi.h
		MULTIPLEXER SUBSYSTEM
		M: Peter Rosin <peda@axentia.se>
		S: Maintained
		F: Documentation/ABI/testing/mux/sysfs-class-mux*
		F: Documentation/devicetree/bindings/mux/
		F: include/linux/dt-bindings/mux/
		F: include/linux/mux/
		F: drivers/mux/

		MULTISOUND SOUND DRIVER
		M: Andrew Veliath <andrewtv@usa.net>

drivers/Kconfig

+2 −0

Original line number	Diff line number	Diff line
		@@ -206,4 +206,6 @@ source "drivers/fsi/Kconfig"

		source "drivers/tee/Kconfig"

		source "drivers/mux/Kconfig"

		endmenu

drivers/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -181,3 +181,4 @@ obj-$(CONFIG_NVMEM) += nvmem/
		obj-$(CONFIG_FPGA) += fpga/
		obj-$(CONFIG_FSI) += fsi/
		obj-$(CONFIG_TEE) += tee/
		obj-$(CONFIG_MULTIPLEXER) += mux/