[PATCH v2 3/6] dt-bindings: mmc: fsl-imx-esdhc: add fsl, broken-auto-tuning binding

[haibo.chen at nxp.com]

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

Add a new fsl,broken-auto-tuning binding for sdio devices. When sdio
device support sdio interrupt, need to use this property to disable
auto-tuning. Auto-tuning circuit is conflict with sdio interrupt.

Signed-off-by: Haibo Chen <haibo.chen at nxp.com>
---
 Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
index b5baf439fbac..d7c8e5880473 100644
--- a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
+++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
@@ -93,6 +93,15 @@ properties:
       tuning step can't find the proper delay window within limited tuning retries.
     default: 0
 
+  fsl,broken-auto-tuning:
+    description: |
+      Recommend for SDIO cards that enables SDIO interrupt for SDR104 and SDR50 mode.
+      SDIO interrupt uses DAT[1] to signal the card's interrupt. Auto-tuning circuit
+      will detect this interrupt on DAT[1] when in 4Bit bus mode, and take it just
+      as normal data, wrongly adjust the delay cell. This property is used to disable
+      the auto-tuning function.
+    type: boolean
+
   fsl,strobe-dll-delay-target:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: |
-- 
2.17.1