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

Josua Mayer
2025-12-10T17:39:24Z

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@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@kernel.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@linaro.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@kernel.org>
Reported-by: Krzysztof Kozlowski <krzk@kernel.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@solid-run.com>