[PATCH v1 2/2] dt-bindings: mmc: mtk-sd: add 64-steps tuning related property

[Axe Yang]

Add 'mediatek,tune-64-steps' option. This property will give MSDC
a chance to achieve a more optimal calibration result, thus avoiding
potential CRC issues.

Signed-off-by: Axe Yang <axe.yang@xxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/mmc/mtk-sd.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
index 3fffa467e4e1..c33301e2ea33 100644
--- a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
+++ b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
@@ -145,6 +145,14 @@ properties:
     minimum: 0
     maximum: 7
 
+  mediatek,tune-64-steps:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Some Soc need enable 64-steps tuning for better delay value to avoid CRC issue.
+      If present, tune 64 steps to cover a complete clock cycle.
+      If not present, tune only 32 steps. For eMMC and SD, this can also yield
+      satisfactory calibration results in most cases.
+
   resets:
     maxItems: 1
 
-- 
2.25.1