linux-kernel - [PATCH 1/2] dt-bindings: mmc: renesas,sdhi: Add mux-states property

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Message-Id: <20251128-rz-sdio-mux-v1-1-1ede318d160f@solid-run.com>
Date: Fri, 28 Nov 2025 17:15:38 +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 1/2] dt-bindings: mmc: renesas,sdhi: Add mux-states
 property

Add mux controller support for when sdio lines are muxed between a host
and multiple cards.

There are several devices supporting a choice of eMMC or SD on a single
board by both dip switch and gpio, e.g. Renesas RZ/G2L SMARC SoM and
SolidRun RZ/G2L SoM.

In-tree dts for the Renesas boards currently rely on preprocessor macros
to hog gpios and define the card.

By adding mux-states property to sdio controller description, boards can
correctly describe the mux that already exists in hardware - and drivers
can coordinate between mux selection and probing for cards.

Signed-off-by: Josua Mayer <josua@...id-run.com>
---
 Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
index c754ea71f51f7..55635c60ad73a 100644
--- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
+++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
@@ -106,6 +106,11 @@ properties:
   iommus:
     maxItems: 1
 
+  mux-states:
+    description:
+      mux controller node to route the SDIO signals from SoC to cards.
+    maxItems: 1
+
   power-domains:
     maxItems: 1
 
@@ -262,9 +267,17 @@ unevaluatedProperties: false
 examples:
   - |
     #include <dt-bindings/clock/r8a7790-cpg-mssr.h>
+    #include <dt-bindings/gpio/gpio.h>
     #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/pinctrl/rzg2l-pinctrl.h>
     #include <dt-bindings/power/r8a7790-sysc.h>
 
+    mux: mux-controller {
+            compatible = "gpio-mux";
+            #mux-state-cells = <1>;
+            mux-gpios = <&pinctrl RZG2L_GPIO(22, 1) GPIO_ACTIVE_LOW>;
+    };
+
     sdhi0: mmc@...00000 {
         compatible = "renesas,sdhi-r8a7790", "renesas,rcar-gen2-sdhi";
         reg = <0xee100000 0x328>;
@@ -275,6 +288,7 @@ examples:
         max-frequency = <195000000>;
         power-domains = <&sysc R8A7790_PD_ALWAYS_ON>;
         resets = <&cpg 314>;
+        mux-states = <&mux 0>;
     };
 
     sdhi1: mmc@...20000 {

-- 
2.51.0