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Message-Id: <20260118-rz-sdio-mux-v5-0-3c37e8872683@solid-run.com>
Date: Sun, 18 Jan 2026 12:28:56 +0200
From: Josua Mayer <josua@...id-run.com>
To: 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>,
Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: 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, Josua Mayer <josua@...id-run.com>
Subject: [PATCH v5 0/7] mmc: host: renesas_sdhi_core: support configuring
an optional sdio mux
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.
Cc: Yazan Shhady <yazan.shhady@...id-run.com>
Cc: Jon Nettleton <jon@...id-run.com>
Cc: Mikhail Anikin <mikhail.anikin@...id-run.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>
To: Vincent Mailhol <mailhol@...nel.org>
To: Vinod Koul <vkoul@...nel.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
To: Peter Rosin <peda@...ntia.se>
To: Aaro Koskinen <aaro.koskinen@....fi>
To: Andreas Kemnade <andreas@...nade.info>
To: Kevin Hilman <khilman@...libre.com>
To: Roger Quadros <rogerq@...nel.org>
To: Tony Lindgren <tony@...mide.com>
To: Janusz Krzysztofik <jmkrzyszt@...il.com>
To: Vignesh R <vigneshr@...com>
To: Andi Shyti <andi.shyti@...nel.org>
To: Ulf Hansson <ulf.hansson@...aro.org>
To: Rob Herring <robh@...nel.org>
To: Krzysztof Kozlowski <krzk+dt@...nel.org>
To: Conor Dooley <conor+dt@...nel.org>
To: Geert Uytterhoeven <geert+renesas@...der.be>
To: Magnus Damm <magnus.damm@...il.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: linux-can@...r.kernel.org
Cc: linux-phy@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-omap@...r.kernel.org
Cc: linux-i2c@...r.kernel.org
Cc: linux-mmc@...r.kernel.org
Cc: devicetree@...r.kernel.org
Cc: linux-renesas-soc@...r.kernel.org
Signed-off-by: Josua Mayer <josua@...id-run.com>
Changes in v5:
- implemented automatic mux deselect for devm_*_selected.
(Reported-by: Wolfram Sang <wsa+renesas@...g-engineering.com>)
- because of semantic changes I dropped reviewed and acks from omap-i2c
patch (Andreas Kemnade / Wolfram Sang).
- fix invalid return value in void function for mux helper stubs
(Reported-by: kernel test robot <lkp@...el.com>)
- Link to v4: https://lore.kernel.org/r/20251229-rz-sdio-mux-v4-0-a023e55758fe@solid-run.com
Changes in v4:
- added MULTIPLEXER Kconfig help text.
- removed "select MULTIPLEXER" from renesas sdhi Kconfig, as it is
not required for all devices using this driver.
- added stubs for all symbols exported by mux core.
(Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>)
- refactored mux core logic to silence ENOENT errors only on optional
code paths, keeping error printing unchanged otherwise.
(Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>)
- picked up various reviewed- and acked-by tags
- Link to v3: https://lore.kernel.org/r/20251210-rz-sdio-mux-v3-0-ca628db56d60@solid-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>
- Link to v1: https://lore.kernel.org/r/20251128-rz-sdio-mux-v1-0-1ede318d160f@solid-run.com
Reported-by:
---
Josua Mayer (7):
phy: can-transceiver: rename temporary helper function to avoid conflict
mux: Add helper functions for getting optional and selected mux-state
mux: add help text for MULTIPLEXER config option
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 | 24 +--
drivers/mmc/host/renesas_sdhi_core.c | 6 +
drivers/mux/Kconfig | 8 +
drivers/mux/core.c | 175 +++++++++++++++++----
drivers/phy/phy-can-transceiver.c | 10 --
include/linux/mux/consumer.h | 111 ++++++++++++-
7 files changed, 278 insertions(+), 62 deletions(-)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251128-rz-sdio-mux-acc5137f1618
Best regards,
--
Josua Mayer <josua@...id-run.com>
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