From 04a8ddc39e5cfebffb06f383350a6ee393ba89a6 Mon Sep 17 00:00:00 2001 From: Iker Pedrosa Date: Mon, 11 May 2026 10:53:56 +0200 Subject: [PATCH] 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 Signed-off-by: Iker Pedrosa Signed-off-by: Ulf Hansson --- .../devicetree/bindings/mmc/spacemit,sdhci.yaml | 15 +++++++++++++++ 1 file changed, 15 insertions(+) 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>; };