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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: hUktw4mTJVXydX67xzt32OCRpPvOYMxh3P1Yk91T5JFcoFXYLHms9BliXwKvWWVh6FSqeInqRC+Ikvf9UGvlLbLuXbJOI06MRz0hM9YPrs4XbGgMENdZR7+TXCgA+UJq9VAm520qLz7nXhPt3JQejHBzjemKabYnERDzMLjtR1M5wAXkBtskoIYkZunKJjETLDNdEz//Czw+0QxKTdVZrCX8SMQrXEcqrawX/m9vM2bI90UrWtthytpGmcSRwbRdI/PUVEiabtxAVF38+8+AjEaix/f6V82LNYEHfEt6gCpDXhjNvcHB2hQEi/Ml9mK29oqb15oQ92XDggvJLoqWcBcL0hHdgXdSoaSRU3JN6BsvYXHGY2r+W+H7LFkIwVKjtEF3sgirohF0gtU8hQbViASwqJg3K7EmT+kbHzPI0ji6Ayjhb/fOkHQpYFAv0P0V X-OriginatorOrg: solid-run.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Feb 2026 11:34:58.3994 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e3c5f3c2-5ba2-4050-843b-08de7461e7eb X-MS-Exchange-CrossTenant-Id: a4a8aaf3-fd27-4e27-add2-604707ce5b82 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=a4a8aaf3-fd27-4e27-add2-604707ce5b82;Ip=[52.17.62.50];Helo=[eu-dlp.cloud-sec-av.com] X-MS-Exchange-CrossTenant-AuthSource: AMS1EPF0000004E.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PA6PR04MB11779 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 @@ # =20 config MULTIPLEXER - tristate + tristate "Generic Multiplexer Support" + default m if COMPILE_TEST + 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. =20 menu "Multiplexer drivers" depends on MULTIPLEXER --=20 2.43.0