linux-kernel - Re: [PATCH v3 2/6] mux: Add helper functions for getting optional and selected mux-state

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20f2128c-c6cb-4b13-aa08-b93e540f5bd9@solid-run.com>
Date: Sun, 21 Dec 2025 10:37:47 +0000
From: Josua Mayer <josua@...id-run.com>
To: Ulf Hansson <ulf.hansson@...aro.org>
CC: 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>, Marc Kleine-Budde <mkl@...gutronix.de>,
	Vincent Mailhol <mailhol@...nel.org>, Vinod Koul <vkoul@...nel.org>, Kishon
 Vijay Abraham I <kishon@...nel.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>, Vignesh R <vigneshr@...com>, Janusz Krzysztofik
	<jmkrzyszt@...il.com>, Andi Shyti <andi.shyti@...nel.org>, Mikhail Anikin
	<mikhail.anikin@...id-run.com>, Yazan Shhady <yazan.shhady@...id-run.com>,
	Jon Nettleton <jon@...id-run.com>, "linux-mmc@...r.kernel.org"
	<linux-mmc@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-renesas-soc@...r.kernel.org"
	<linux-renesas-soc@...r.kernel.org>, "linux-can@...r.kernel.org"
	<linux-can@...r.kernel.org>, "linux-phy@...ts.infradead.org"
	<linux-phy@...ts.infradead.org>, "linux-omap@...r.kernel.org"
	<linux-omap@...r.kernel.org>, "linux-i2c@...r.kernel.org"
	<linux-i2c@...r.kernel.org>
Subject: Re: [PATCH v3 2/6] mux: Add helper functions for getting optional and
 selected mux-state

Hi Ulf,

Am 17.12.25 um 14:38 schrieb Ulf Hansson:
> On Wed, 10 Dec 2025 at 18:39, Josua Mayer <josua@...id-run.com> wrote:

cut

>>  /*
>>   * Using subsys_initcall instead of module_init here to try to ensure - for
>>   * the non-modular case - that the subsystem is initialized when mux consumers
>> diff --git a/include/linux/mux/consumer.h b/include/linux/mux/consumer.h
>> index 2e25c838f8312..a5da2e33a45c0 100644
>> --- a/include/linux/mux/consumer.h
>> +++ b/include/linux/mux/consumer.h
>> @@ -60,5 +60,9 @@ struct mux_control *devm_mux_control_get(struct device *dev,
>>                                          const char *mux_name);
>>  struct mux_state *devm_mux_state_get(struct device *dev,
>>                                      const char *mux_name);
>> +struct mux_state *devm_mux_state_get_optional(struct device *dev,
>> +                                             const char *mux_name);
>> +struct mux_state *devm_mux_state_get_optional_selected(struct device *dev,
>> +                                                      const char *mux_name);
> Seems like we need stub-functions of these too. Otherwise
> subsystems/drivers need to have a "depends on MULTIPLEXER" in their
> Kconfigs.

Currently the drivers that can use a mux select MULTIPLEXER in Kconfig.

There already exist a few mux helpers both for mux-state and for mux-control,
and they might all need stubs.

I'd prefer the restructuring of kconfig dependencies being independent from
adding mux-state functionality to renesas sdhi driver.

sincerely
Josua Mayer