[PATCH 3/6] dt-bindings: mmc: fsl-imx-esdhc: add fsl,sdio-async-interrupt-enabled binding

[haibo.chen@nxp.com]

From: Haibo Chen <haibo.chen@nxp.com>

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 <haibo.chen@nxp.com>
---
 .../devicetree/bindings/mmc/fsl-imx-esdhc.yaml         | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
index b5baf439fbac..8a9f1775b0e2 100644
--- a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
+++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
@@ -122,6 +122,16 @@ properties:
       - const: state_200mhz
       - 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
-- 
2.17.1