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b=kAS48+zZ/dAUneAQe78DTxeGThwy5S5Ruv6lBpYmU4Afhvc3but/58ra0NfJKHjFpvAyMFhIXa9f7wkzq7n1rj+Tg6hJVXuUYMsXGtPN6Bo2mqLyplTSFDAkuKJaPMZWkUp/itJbEcfJ7OlicSqRtVEUq2tIQXVrvQwYKP1SuW8= Received: from PAXPR04MB8749.eurprd04.prod.outlook.com (2603:10a6:102:21f::22) by AM9PR04MB8844.eurprd04.prod.outlook.com (2603:10a6:20b:40b::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9587.19; Mon, 9 Feb 2026 11:31:31 +0000 Received: from PAXPR04MB8749.eurprd04.prod.outlook.com ([fe80::d782:fbb2:be9a:43f1]) by PAXPR04MB8749.eurprd04.prod.outlook.com ([fe80::d782:fbb2:be9a:43f1%3]) with mapi id 15.20.9587.017; Mon, 9 Feb 2026 11:31:31 +0000 From: Josua Mayer To: Peter Rosin , Marc Kleine-Budde , Vincent Mailhol , Vinod Koul , Neil Armstrong , Aaro Koskinen , Andreas Kemnade , Kevin Hilman , Roger Quadros , Tony Lindgren , Janusz Krzysztofik , Vignesh R , Andi Shyti , Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Geert Uytterhoeven , Magnus Damm , Wolfram Sang CC: Yazan Shhady , Jon Nettleton , Mikhail Anikin , "linux-can@vger.kernel.org" , "linux-phy@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-omap@vger.kernel.org" , "linux-i2c@vger.kernel.org" , "linux-mmc@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-renesas-soc@vger.kernel.org" Subject: Re: [PATCH v9 3/7] mux: add help text for MULTIPLEXER config option Thread-Topic: [PATCH v9 3/7] mux: add help text for MULTIPLEXER config option Thread-Index: AQHcmRESUG4499YSf0mIlO8cui8aobV6NzeAgAAF7AA= Date: Mon, 9 Feb 2026 11:31:31 +0000 Message-ID: References: <20260208-rz-sdio-mux-v9-0-9a3be13c1280@solid-run.com> <20260208-rz-sdio-mux-v9-3-9a3be13c1280@solid-run.com> In-Reply-To: Accept-Language: de-DE, en-US Content-Language: de-DE X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-traffictypediagnostic: PAXPR04MB8749:EE_|AM9PR04MB8844:EE_|AM3PEPF00009BA0:EE_|VI1PR04MB6925:EE_ X-MS-Office365-Filtering-Correlation-Id: cda0e617-d5bb-4e58-42ce-08de67cecb7e x-cloud-sec-av-info: solidrun,office365_emails,sent,inline X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|1800799024|7416014|376014|366016|921020|38070700021; 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X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org Hi Peter, On 09/02/2026 13:10, Peter Rosin wrote: > 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 >> --- >> 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." The patch description didn't make the decision logic clear, and I plan to submit a standalone patch for this after v7.0-rc1. Basically existing drivers using mux core used "select" to enable it, even though the core can function standalone with device-tree. Some of these users (phy-can-transceiver) function perfectly perfectly fine without mux, and use it as an optional feature. Likely drivers only used "select" to avoid writing helper functions, prompt, kconfig description and stubs - which this patch-set added. So I will argue that some existing users relying on "select" was wrong, and that the mux framework is generally useful on its own. -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy