linux-kernel - Re: [PATCH v8 3/7] mux: add help text for MULTIPLEXER config option

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Message-ID: <b7dcb374-b79c-4e9f-ac30-2f507127cfb3@solid-run.com>
Date: Sun, 8 Feb 2026 15:16:36 +0000
From: Josua Mayer <josua@...id-run.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>, Vincent Mailhol
	<mailhol@...nel.org>, Vinod Koul <vkoul@...nel.org>, Neil Armstrong
	<neil.armstrong@...aro.org>, Peter Rosin <peda@...ntia.se>, Aaro Koskinen
	<aaro.koskinen@....fi>, Andreas Kemnade <andreas@...nade.info>, Kevin Hilman
	<khilman@...libre.com>, Roger Quadros <rogerq@...nel.org>, Tony Lindgren
	<tony@...mide.com>, Janusz Krzysztofik <jmkrzyszt@...il.com>, Vignesh R
	<vigneshr@...com>, Andi Shyti <andi.shyti@...nel.org>, Ulf Hansson
	<ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
	<krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Geert Uytterhoeven
	<geert+renesas@...der.be>, Magnus Damm <magnus.damm@...il.com>, Wolfram Sang
	<wsa+renesas@...g-engineering.com>
CC: Yazan Shhady <yazan.shhady@...id-run.com>, Jon Nettleton
	<jon@...id-run.com>, Mikhail Anikin <mikhail.anikin@...id-run.com>,
	"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
	"linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
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	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v8 3/7] mux: add help text for MULTIPLEXER config option

On 03/02/2026 15:01, Josua Mayer wrote:
> Add prompt and help text for CONFIG_MULTIPLEXER to allow enabling this
> option thorugh the kernel configuration without explicit "select" driver
> dependencies.
>
> Select it by default when COMPILE_TEST is set for better coverage.
>
> Signed-off-by: Josua Mayer <josua@...id-run.com>
> ---
>   drivers/mux/Kconfig | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig
> index c68132e38138..e31c46820bdf 100644
> --- a/drivers/mux/Kconfig
> +++ b/drivers/mux/Kconfig
> @@ -4,7 +4,13 @@
>   #
>   
>   config MULTIPLEXER
> -	tristate
> +	tristate "Generic Multiplexer Support" if COMPILE_TEST

This didn't do what I thought it would.
It was my intention to allow enabling this through menuconfig / .config.

With the syntax above menuconfig shows:

│ Symbol: MULTIPLEXER [=n]
│ Type  : tristate
│ Defined at drivers/mux/Kconfig:6
│   Prompt: Generic Multiplexer Support
│   Visible if: COMPILE_TEST [=n]

This means it cannot be selected.

Instead I (think I) should use
default m if COMPILE_TEST

Since my patch-set broke x86_64 allmodconfig and failed merge into 
linux-next,
this presents an opportunity to change the above as well with 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.
>   
>   menu "Multiplexer drivers"
>   	depends on MULTIPLEXER
>