linux-kernel - Re: [PATCH v6 3/7] mux: add help text for MULTIPLEXER config option

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Message-ID: <CAMuHMdX_rKgfusHP5qVny8OZufU6VAiA6sqg1LP3T2jikSz7yQ@mail.gmail.com>
Date: Wed, 21 Jan 2026 11:59:52 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Josua Mayer <josua@...id-run.com>
Cc: 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>, 
	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 v6 3/7] mux: add help text for MULTIPLEXER config option

Hi Josua,

On Wed, 21 Jan 2026 at 11:02, Josua Mayer <josua@...id-run.com> wrote:
> Add help text for CONFIG_MULTIPLEXER to allow enabling this option
> through the kernel configuration without explicit "select" driver
> dependencies.
>
> Signed-off-by: Josua Mayer <josua@...id-run.com>

Thanks for your patch!

> --- a/drivers/mux/Kconfig
> +++ b/drivers/mux/Kconfig
> @@ -5,6 +5,14 @@
>
>  config MULTIPLEXER
>         tristate
> +       help
> +         Generic Multiplexer Support.
> +
> +         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
>

Unfortunately it doesn't work like that. As the tristate has no prompt
specified, the user will never be asked about this.
You should use something like below:

--- a/drivers/mux/Kconfig
+++ b/drivers/mux/Kconfig
@@ -4,10 +4,8 @@
 #

 config MULTIPLEXER
-       tristate
+       tristate "Generic Multiplexer Support" if COMPILE_TEST
        help
-         Generic Multiplexer Support.
-
          This framework is designed to abstract multiplexer handling for
          devices via various GPIO-, MMIO/Regmap or specific multiplexer
          controller chips.

Sorry for not noticing before.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds