linux-kernel - Re: [PATCH v3 0/6] mmc: host: renesas_sdhi_core: support configuring an optional sdio mux

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Message-ID: <CAPDyKFr7DCRs_E4VfrY9-NY8-bStT9oAZaYhUZDg_y3KEW9DWQ@mail.gmail.com>
Date: Wed, 17 Dec 2025 14:42:21 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Josua Mayer <josua@...id-run.com>
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, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
	linux-can@...r.kernel.org, linux-phy@...ts.infradead.org, 
	linux-omap@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH v3 0/6] mmc: host: renesas_sdhi_core: support configuring
 an optional sdio mux

On Wed, 10 Dec 2025 at 18:39, Josua Mayer <josua@...id-run.com> wrote:
>
> Some Renesas SoC based boards mux SD and eMMC on a single sdio
> controller, exposing user control by dip switch and software control by
> gpio.
>
> Purpose is to simplify development and provisioning by selecting boot
> media at power-on, and again before starting linux.
>
> Add binding and driver support for linking a (gpio) mux to renesas sdio
> controller.
>
> Introduce generic helper functions for getting managed and selected
> mux-state objects, and switch i2c-omap and phy-can-transceiver drivers.
>
> Signed-off-by: Josua Mayer <josua@...id-run.com>
> ---
> Changes in v3:
> - updated omap-i2c and phy-can-transceiver to use new helpers.
> - created generic helper functions for getting managed optional mux-state.
>   (Reported-by: Rob Herring <robh@...nel.org>)
> - picked up binding ack by Rob Herring.
> - replaced use of "SDIO" with "SD/SDIO/eMMC" in binding document and
>   commit descriptions.
>   (Reported-by: Ulf Hansson <ulf.hansson@...aro.org>)
> - Link to v2: https://lore.kernel.org/r/20251201-rz-sdio-mux-v2-0-bcb581b88dd7@solid-run.com
>
> Changes in v2:
> - dropped mux-controller node from dt binding example
>   (Reported-by: Conor Dooley <conor@...nel.org>
>    Reported-by: Krzysztof Kozlowski <krzk@...nel.org>)
> - Link to v1: https://lore.kernel.org/r/20251128-rz-sdio-mux-v1-0-1ede318d160f@solid-run.com
>
> ---
> Josua Mayer (6):
>       phy: can-transceiver: rename temporary helper function to avoid conflict
>       mux: Add helper functions for getting optional and selected mux-state
>       phy: can-transceiver: drop temporary helper getting optional mux-state
>       i2c: omap: switch to new generic helper for getting selected mux-state
>       dt-bindings: mmc: renesas,sdhi: Add mux-states property
>       mmc: host: renesas_sdhi_core: support selecting an optional mux
>
>  .../devicetree/bindings/mmc/renesas,sdhi.yaml      |  6 ++
>  drivers/i2c/busses/i2c-omap.c                      | 19 ++----
>  drivers/mmc/host/Kconfig                           |  1 +
>  drivers/mmc/host/renesas_sdhi.h                    |  1 +
>  drivers/mmc/host/renesas_sdhi_core.c               | 16 +++++-
>  drivers/mux/core.c                                 | 67 +++++++++++++++++++---
>  drivers/phy/phy-can-transceiver.c                  | 10 ----
>  include/linux/mux/consumer.h                       |  4 ++
>  8 files changed, 89 insertions(+), 35 deletions(-)
> ---
> base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
> change-id: 20251128-rz-sdio-mux-acc5137f1618
>
> Best regards,
> --
> Josua Mayer <josua@...id-run.com>

Looks like this needs to go together or if someone can host the common
parts via an immutable branch.

Anyway, I am expecting some discussion or update for patch2 first.

Kind regards
Uffe