Re: [PATCH v2 1/2] dt-bindings: mmc: renesas,sdhi: Add mux-states property

[Josua Mayer <josua@solid-run.com>]

Am 09.12.25 um 13:08 schrieb Ulf Hansson:

> On Mon, 1 Dec 2025 at 13:31, Josua Mayer <josua@solid-run.com> wrote:
>> Add mux controller support for when sdio lines are muxed between a host
>> and multiple cards.
> We have the SD, SDIO, (e)MMC interfaces with their corresponding pins.
> Using "sdio lines" becomes confusing as it kind of indicates this is
> for "SDIO" only.
Agreed.
>
>> 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
> Again, please don't use "sdio" here.
Ack.
>
>> 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@solid-run.com>
>> ---
>>  Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
>> index c754ea71f51f7..754ccb1c30efb 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.
> I suggest we change from "SDIO" to "SD/SDIO/eMMC".

Agreed.

I will replace here, and reword each commit description for v3.

>
>> +    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 {
>>
>> --
>> 2.51.0
>>
>>
> Kind regards
> Uffe
>
>