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

Ulf Hansson
2025-12-17T13:43:00Z

On Wed, 10 Dec 2025 at 18:39, Josua Mayer <josua@solid-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@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>

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