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

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Message-ID: <4f8606fd-2233-4de8-82e6-672ec597a635@solid-run.com>
Date: Sun, 21 Dec 2025 10:45:25 +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 0/6] mmc: host: renesas_sdhi_core: support configuring
 an optional sdio mux

Am 17.12.25 um 14:42 schrieb Ulf Hansson:
> 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.
Yes. Patch 1 is critical and must be applied before 2. Patches 3-5 require 2.
>
> Anyway, I am expecting some discussion or update for patch2 first.
>
> Kind regards
> Uffe
>