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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org Am 25.02.26 um 13:24 schrieb Ulf Hansson: > On Wed, 25 Feb 2026 at 12:35, Josua Mayer wrote: >> The multiplexer subsystem was initially designed only for use by drivers >> that require muxes, and did in particular not consider optional muxes or >> to compile as a module. >> >> Over time several drivers have added a "select MULTIPLEXER" dependency, >> 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. >> >> Further some drivers such as gpio-mux are useful on their own (e.g. >> through device-tree idle-state property), but can not currently be >> selected through menuconfig unless another driver selecting MULTIPLEXER >> symbol was enabled first. >> >> The natural step forward to allow enabling mux core and drivers would be >> adding prompt and help text to the existing symbol. >> >> This violates the general kbuild advice to avoid selecting visible >> symbols. >> >> Alternatively addition of a wrapper symbol MUX_CORE was considered, >> which in turn would "select MULTIPLEXER". This however creates new >> issues and confusion as MULTIPLEXER and MUX_CORE need to share the same >> state, i.e. MUX_CORE in menuconfig must not be set to m while >> MULTIPLEXER was selected builtin. Further confusion occurs with Kconfig >> "depends on" relationships that could reference either MUX_CORE or >> MULTIPLEXER. >> >> It is common across the tree for subsystem symbols to be both visible >> and selected, e.g. I2C & SPI. In the same spirit multiplexer needs to >> ignore this particular kbuild rule. >> >> Add prompt and help text to the existing MULTIPLEXER symbol, making it >> visible in (menu)config without breaking existing "select MULTIPLEXER" >> occurrences in the tree. >> >> Select it by default when COMPILE_TEST is set for better coverage. >> >> Signed-off-by: Josua Mayer >> --- >> drivers/mux/Kconfig | 9 ++++++++- >> 1 file changed, 8 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig >> index c68132e38138..4f7c6bb86fc6 100644 >> --- a/drivers/mux/Kconfig >> +++ b/drivers/mux/Kconfig >> @@ -4,7 +4,14 @@ >> # >> >> config MULTIPLEXER >> - tristate >> + tristate "Generic Multiplexer Support" >> + default m if COMPILE_TEST > Allowing the core being a module makes things/code a bit unnecessarily > complicated, I think. > > Similar to other subsystems (like regulators/clk/etc), the core is a > bool and the menu below it for its provider drivers depends on it to > be configurable, allowing them to be tristate. This seems reasonable. Before revising this patch I'd appreciate input from Peter Rosin, who had strong opinions on v9. >> + help >> + This framework is designed to abstract multiplexer handling for >> + devices via various GPIO-, MMIO/Regmap or specific multiplexer >> + controller chips. >> + >> + If unsure, say no. >> > continuing from the above comment, this would instead be: > > if MULTIPLEXER > > menu "Multiplexer drivers" > > >> menu "Multiplexer drivers" >> depends on MULTIPLEXER >> >> -- >> 2.43.0 >> > Kind regards > Uffe -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy