linux-kernel - Re: [PATCH v9 3/7] mux: add help text for MULTIPLEXER config option

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Message-ID: <bc5fbfc5-6f71-eeed-ad90-0c1b835e65ea@axentia.se>
Date: Mon, 9 Feb 2026 12:10:19 +0100
From: Peter Rosin <peda@...ntia.se>
To: Josua Mayer <josua@...id-run.com>, Marc Kleine-Budde
 <mkl@...gutronix.de>, Vincent Mailhol <mailhol@...nel.org>,
 Vinod Koul <vkoul@...nel.org>, Neil Armstrong <neil.armstrong@...aro.org>,
 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-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-omap@...r.kernel.org, linux-i2c@...r.kernel.org,
 linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v9 3/7] mux: add help text for MULTIPLEXER config option

Hi!

2026-02-08 at 16:38, 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 | 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
> +	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
> 

I'm not comfortable with making MULTIPLEXER a visible symbol. It is meant to
be selected when needed (and there are a dozen or so instances). The kbuild
docs has this on the subject:

	"In general use select only for non-visible symbols (no prompts
	 anywhere) and for symbols with no dependencies."

Cheers,
Peter