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
