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* mux: make device_type constBhumika Goyal2017-08-291-1/+1
| | | | | | | | | | Make this const as it is only stored in the type field of a device structure, which is const. Done using Coccinelle. Signed-off-by: Bhumika Goyal <bhumirks@gmail.com> Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mux: zap mux- prefix from the source filesPeter Rosin2017-08-285-0/+5
| | | | | | | Preserve the module names with Makefile additions. Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mux: convert to using %pOF instead of full_nameRob Herring2017-08-281-6/+6
| | | | | | | | | | Now that we have a custom printf format specifier, convert users of full_name to use %pOF instead. This is preparation to remove storing of the full path string for each node. Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mux: mux-core: unregister mux_class in mux_exit()Kuppuswamy Sathyanarayanan2017-07-171-1/+1
| | | | | | | | | Fixes an obvious and nasty typo. Fixes: a3b02a9c6591 ("mux: minimal mux subsystem") Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mux: remove the Kconfig question for the subsystemPeter Rosin2017-07-171-14/+5
| | | | | | | | | | The MULTIPLEXER question in the Kconfig might be confusing and is of dubious value. Remove it. This makes consumers responsible for selecting MULTIPLEXER, which they already do. Signed-off-by: Peter Rosin <peda@axentia.se> Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mux: adg792a: always require I2C supportArnd Bergmann2017-06-091-1/+1
| | | | | | | | | | | | | | | | | | | COMPILE_TEST makes no sense when I2C is disabled, as the driver cannot compile in that configuration: drivers/mux/mux-adg792a.c: In function 'adg792a_write_cmd': drivers/mux/mux-adg792a.c:34:9: error: implicit declaration of function 'i2c_smbus_write_byte_data'; did you mean 'i2c_set_clientdata'? [-Werror=implicit-function-declaration] drivers/mux/mux-adg792a.o: In function `adg792a_driver_init': mux-adg792a.c:(.init.text+0x14): undefined reference to `i2c_register_driver' drivers/mux/mux-adg792a.o: In function `adg792a_probe': mux-adg792a.c:(.text.adg792a_probe+0x94): undefined reference to `i2c_smbus_write_byte_data' drivers/mux/mux-adg792a.o: In function `adg792a_set': mux-adg792a.c:(.text.adg792a_set+0x80): undefined reference to `i2c_smbus_write_byte_data' Fixes: afda08c4caa9 ("mux: adg792a: add mux controller driver for ADG792A/G") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Peter Rosin <peda@axentia.se> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mux: mmio-based syscon mux controllerPhilipp Zabel2017-06-033-0/+155
| | | | | | | | | This adds a driver for mmio-based syscon multiplexers controlled by bitfields in a syscon register range. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mux: adg792a: add mux controller driver for ADG792A/GPeter Rosin2017-06-033-0/+170
| | | | | | | | Analog Devices ADG792A/G is a triple 4:1 mux. Reviewed-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mux: gpio: add mux controller driver for gpio based multiplexersPeter Rosin2017-06-033-0/+133
| | | | | | | | | | | | The driver builds a single multiplexer controller using a number of gpio pins. For N pins, there will be 2^N possible multiplexer states. The GPIO pins can be connected (by the hardware) to several multiplexers, which in that case will be operated in parallel. Reviewed-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Peter Rosin <peda@axentia.se> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mux: minimal mux subsystemPeter Rosin2017-06-033-0/+568
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>
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