linux-kernel - Re: [PATCH v8 7/7] mmc: host: renesas_sdhi_core: support selecting an optional mux

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Message-ID: <aYNp9Uqj-Sq67T7N@shikoro>
Date: Wed, 4 Feb 2026 16:47:01 +0100
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
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>,
	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 v8 7/7] mmc: host: renesas_sdhi_core: support selecting
 an optional mux

On Tue, Feb 03, 2026 at 03:01:40PM +0200, Josua Mayer wrote:
> Some hardware designs route data or control signals through a mux to
> support multiple devices on a single sdhi controller.
> 
> In particular SolidRun RZ/G2L/G2LC/V2L System on Module use a mux for
> switching between soldered eMMC and an optional microSD on a carrier
> board, e.g. for development or provisioning.
> 
> SD/SDIO/eMMC are not well suited for runtime switching between different
> cards, however boot-time selection is possible and useful - in
> particular considering dt overlays.
> 
> Add support for an optional SD/SDIO/eMMC mux defined in dt, and select
> it during probe.
> 
> Similar functionality already exists in other places, e.g. i2c-omap.
> 
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Signed-off-by: Josua Mayer <josua@...id-run.com>

And to confirm the obvious, no regression found on a Renesas SparrowHawk
(R-Car V4H) not using muxes:

Tested-by: Wolfram Sang <wsa+renesas@...g-engineering.com>