linux-kernel - [PATCH v2 0/2] mmc: host: renesas_sdhi_core: support configuring an optional sdio mux

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Message-Id: <20251201-rz-sdio-mux-v2-0-bcb581b88dd7@solid-run.com>
Date: Mon, 01 Dec 2025 13:31:09 +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>
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, Josua Mayer <josua@...id-run.com>
Subject: [PATCH v2 0/2] 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.

Signed-off-by: Josua Mayer <josua@...id-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 (2):
      dt-bindings: mmc: renesas,sdhi: Add mux-states property
      mmc: host: renesas_sdhi_core: support configuring an optional sdio mux

 .../devicetree/bindings/mmc/renesas,sdhi.yaml      |  6 +++++
 drivers/mmc/host/Kconfig                           |  1 +
 drivers/mmc/host/renesas_sdhi.h                    |  1 +
 drivers/mmc/host/renesas_sdhi_core.c               | 27 +++++++++++++++++++---
 4 files changed, 32 insertions(+), 3 deletions(-)
---
base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
change-id: 20251128-rz-sdio-mux-acc5137f1618

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