linux-kernel - [PATCH v4 0/7] mmc: host: renesas_sdhi_core: support configuring an optional sdio mux

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Message-Id: <20251229-rz-sdio-mux-v4-0-a023e55758fe@solid-run.com>
Date: Mon, 29 Dec 2025 15:27:24 +0100
From: Josua Mayer <josua@...id-run.com>
To: 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>,
 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>,
 Neil Armstrong <neil.armstrong@...aro.org>
Cc: 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, Josua Mayer <josua@...id-run.com>
Subject: [PATCH v4 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.

Signed-off-by: Josua Mayer <josua@...id-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>
   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 (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                      |  19 +--
 drivers/mmc/host/renesas_sdhi.h                    |   1 +
 drivers/mmc/host/renesas_sdhi_core.c               |  16 ++-
 drivers/mux/Kconfig                                |   8 ++
 drivers/mux/core.c                                 | 153 ++++++++++++++++++---
 drivers/phy/phy-can-transceiver.c                  |  10 --
 include/linux/mux/consumer.h                       | 111 ++++++++++++++-
 8 files changed, 272 insertions(+), 52 deletions(-)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251128-rz-sdio-mux-acc5137f1618

Best regards,
-- 
Josua Mayer <josua@...id-run.com>