From 3fe02605d28ee14ab3c3a2afef3ee2ad71cda9aa Mon Sep 17 00:00:00 2001 From: Haibo Chen Date: Mon, 16 Aug 2021 18:57:08 +0800 Subject: dt-bindings: mmc: fsl-imx-esdhc: add fsl,sdio-async-interrupt-enabled binding Add a new fsl,sdio-async-interrupt-enabled binding for sdio devices which enable the async interrupt function. When get this property, driver will avoid to use DAT[1] for hardware auto tuning check. Signed-off-by: Haibo Chen --- Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'Documentation/devicetree/bindings/mmc') diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml index a3412f221104..85a10052b248 100644 --- a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml +++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml @@ -128,6 +128,16 @@ properties: - const: default - const: sleep + fsl,sdio-async-interrupt-enabled: + description: | + Recommend for SDIO cards that enables SDIO async interrupt for SDR104 and SDR50 + operating modes. SDIO async interrupt uses DAT[1] to signal the card's interrupt. + uSDHC tuning mechanism must use DAT[0] and CMD signals to avoid a possible + conflict and incorrect delay line calculated by the uSDHC auto tuning mechanism. + Enabling this device tree property is only recommended for layouts that are + matching the SD interface length. + type: boolean + required: - compatible - reg -- cgit v1.2.3