| ce5c7c17 | 26-Feb-2026 |
Josua Mayer <josua@solid-run.com> |
mux: add visible config symbol to enable multiplexer subsystem
The multiplexer subsystem was initially designed to be completely
hidden, relying on consumers to "select MULTIPLEXER" explicitly.
Dri
mux: add visible config symbol to enable multiplexer subsystem
The multiplexer subsystem was initially designed to be completely
hidden, relying on consumers to "select MULTIPLEXER" explicitly.
Drivers implementing multiplexers depend on this hidden symbol.
This prevents users from manually enabling both the mux core and any of
the multiplexer drivers.
All multiplexer drivers in drivers/mux/ can operate standalone without a
consumer. This is particularly useful in a device-tree, where a default
state can be set through the idle-state property.
Over time, several drivers have added "select MULTIPLEXER" dependencies,
some of which require a mux and some consider it optional. v7.0-rc1
shows 15 such occurrences in Kconfig files, in a variety of subsystems.
The natural step forward to allow enabling mux core and drivers would be
adding a prompt and help text to the existing symbol.
This violates the general Kbuild advice to avoid selecting visible
symbols for all existing consumers of the mux core.
Add the new config symbol MUX_CORE with a prompt and help text as a
wrapper for users to enable manually. This avoids existing consumers
automatically selecting a visible symbol.
Change the MULTIPLEXER symbol from tristate to bool. This avoids complex
dependencies if users were to attempt a configuration where the mux is a
module but one of its consumers is built-in, as well as difficulties
keeping the state of visible and invisible symbols in sync.
Further convert the "menu ... depends on ..." structure to "if ... menu
... endmenu endif". These are functionally equivalent, but the new
structure is more efficient and can support future source statements
within the conditional block.
Signed-off-by: Josua Mayer <josua@solid-run.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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| 9761037d | 01-May-2025 |
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> |
mux: adgs1408: fix Wvoid-pointer-to-enum-cast warning
'chip_id' is an enum, thus cast of pointer on 64-bit compile test with
W=1 causes:
adgs1408.c:63:12: error: cast to smaller integer type 'enu
mux: adgs1408: fix Wvoid-pointer-to-enum-cast warning
'chip_id' is an enum, thus cast of pointer on 64-bit compile test with
W=1 causes:
adgs1408.c:63:12: error: cast to smaller integer type 'enum adgs1408_chip_id' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast]
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250501181819.164207-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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| 12d3c69b | 27-Mar-2025 |
Srinivas Kandagatla <srinivas.kandagatla@linaro.org> |
mux: gpio: add optional regulator support
Some of the external muxes needs powering up using a regulator.
This is the case with Lenovo T14s laptop which has a external audio mux
to handle US/EURO he
mux: gpio: add optional regulator support
Some of the external muxes needs powering up using a regulator.
This is the case with Lenovo T14s laptop which has a external audio mux
to handle US/EURO headsets.
Add support to the driver to handle this optional regulator.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Tested-by: Christopher Obbard <christopher.obbard@linaro.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20250327100633.11530-3-srinivas.kandagatla@linaro.org
[krzk: Adjust dev_err message per Johan's review]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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| 61de83fd | 23-Jan-2025 |
Andrew Davis <afd@ti.com> |
mux: mmio: Do not use syscon helper to build regmap
The syscon helper device_node_to_regmap() is used to fetch a regmap
registered to a device node. It also currently creates this regmap
if the node
mux: mmio: Do not use syscon helper to build regmap
The syscon helper device_node_to_regmap() is used to fetch a regmap
registered to a device node. It also currently creates this regmap
if the node did not already have a regmap associated with it. This
should only be used on "syscon" nodes. This driver is not such a
device and instead uses device_node_to_regmap() on its own node as
a hacky way to create a regmap for itself.
This will not work going forward and so we should create our regmap
the normal way by defining our regmap_config, fetching our memory
resource, then using the normal regmap_init_mmio() function.
Signed-off-by: Andrew Davis <afd@ti.com>
Tested-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20250123182059.597491-1-afd@ti.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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| 7ea3876a | 09-Apr-2025 |
Arnd Bergmann <arnd@arndb.de> |
mux: adg792a: remove incorrect of_match_ptr annotation
Building with W=1 shows a warning about adg792a_of_match being unused
when CONFIG_OF is disabled:
drivers/mux/adg792a.c:134:34: error: unused
mux: adg792a: remove incorrect of_match_ptr annotation
Building with W=1 shows a warning about adg792a_of_match being unused
when CONFIG_OF is disabled:
drivers/mux/adg792a.c:134:34: error: unused variable 'adg792a_of_match' [-Werror,-Wunused-const-variable]
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250409122314.2848028-4-arnd@kernel.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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| 702a0950 | 06-Jun-2024 |
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> |
mux: adgs1408: simplify with spi_get_device_match_data()
Use spi_get_device_match_data() helper to simplify a bit the driver.
Link: https://lore.kernel.org/r/20240606142443.130517-1-krzysztof.kozlo
mux: adgs1408: simplify with spi_get_device_match_data()
Use spi_get_device_match_data() helper to simplify a bit the driver.
Link: https://lore.kernel.org/r/20240606142443.130517-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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