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| author | Josua Mayer <josua@solid-run.com> | 2026-02-26 16:21:15 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2026-03-09 15:44:45 +0300 |
| commit | bc0d3adf2f47439e8b7ffd228154d71b8acb50e6 (patch) | |
| tree | b18fe3d9d29a876da706ac6e9f82bc36ce504925 | |
| parent | 43c00f2bcff7c6e235f0c1b1eb18a6db0aa23815 (diff) | |
| download | linux-bc0d3adf2f47439e8b7ffd228154d71b8acb50e6.tar.xz | |
dt-bindings: mmc: renesas,sdhi: Add mux-states property
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>
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml index c754ea71f51f..64fac0d11329 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 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 { |