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dt-bindings: mmc: renesas,sdhi: Add mux-states property

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Add mux controller support for data or control lines that 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
and gpio hogs to describe the respective cards.

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

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Josua Mayer <josua@solid-run.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Josua Mayer 2026-02-26 15:21:15 +02:00 committed by Ulf Hansson
parent 43c00f2bcf
commit bc0d3adf2f
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
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@ -106,6 +106,11 @@ properties:
iommus:
maxItems: 1
mux-states:
description:
mux controller node to route the SD/SDIO/eMMC signals from SoC to cards.
maxItems: 1
power-domains:
maxItems: 1
@ -275,6 +280,7 @@ examples:
max-frequency = <195000000>;
power-domains = <&sysc R8A7790_PD_ALWAYS_ON>;
resets = <&cpg 314>;
mux-states = <&mux 0>;
};
sdhi1: mmc@ee120000 {