linux-kernel - Re: [PATCH v5 7/7] mmc: host: renesas_sdhi_core: support selecting an optional mux

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Message-ID: <CAMuHMdU5shzYs27wO2A0SoisGBMo8RHf9DO-ubC6VrhWECEPCw@mail.gmail.com>
Date: Tue, 20 Jan 2026 10:49:32 +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>, 
	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 v5 7/7] mmc: host: renesas_sdhi_core: support selecting an
 optional mux

On Sun, 18 Jan 2026 at 11:29, Josua Mayer <josua@...id-run.com> 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.
>
> Signed-off-by: Josua Mayer <josua@...id-run.com>

LGTM, so
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

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