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| author | Iker Pedrosa <ikerpedrosam@gmail.com> | 2026-05-11 11:53:56 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2026-05-11 18:35:47 +0300 |
| commit | 04a8ddc39e5cfebffb06f383350a6ee393ba89a6 (patch) | |
| tree | f44c4cd77d4b8cd7d8cdb7d48e1f6c1cb19dcbe7 | |
| parent | d11f110c4ad2d431f4440baba9afb5b8e4190977 (diff) | |
| download | linux-04a8ddc39e5cfebffb06f383350a6ee393ba89a6.tar.xz | |
dt-bindings: mmc: spacemit,sdhci: add pinctrl support for voltage switching
Document pinctrl properties to support voltage-dependent pin
configuration switching for UHS-I SD card modes.
Add optional pinctrl-names property with two states:
- "default": For 3.3V operation with standard drive strength
- "state_uhs": For 1.8V operation with optimized drive strength
These pinctrl states allow the SDHCI driver to coordinate voltage
switching with pin configuration changes, ensuring proper signal
integrity during UHS-I mode transitions.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Iker Pedrosa <ikerpedrosam@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml b/Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml index 9a055d963a7f..34d202af909f 100644 --- a/Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml +++ b/Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml @@ -44,6 +44,18 @@ properties: - const: axi - const: sdh + pinctrl-names: + minItems: 1 + items: + - const: default + - const: uhs + + pinctrl-0: + description: Default pinctrl state for 3.3V operation + + pinctrl-1: + description: Optional pinctrl state for 1.8V UHS operation with "uhs" name + required: - compatible - reg @@ -62,4 +74,7 @@ examples: interrupt-parent = <&plic>; clocks = <&clk_apmu 10>, <&clk_apmu 13>; clock-names = "core", "io"; + pinctrl-names = "default", "uhs"; + pinctrl-0 = <&sdhci_default_cfg>; + pinctrl-1 = <&sdhci_uhs_cfg>; }; |