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dt-bindings: mmc: mtk-sd: add tuning steps related property 

Add 'mediatek,tuning-steps' setting. This property will give MSDC
a chance to extend tuning steps up to 64. With more tuning steps,
MSDC may achieve a more optimal calibration result, thus avoiding
potential CRC issues.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Axe Yang <axe.yang@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20231207063535.29546-2-axe.yang@mediatek.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Axe Yang 2023-12-07 14:35:34 +08:00 committed by Ulf Hansson
parent 1f30f51053
commit ec1aaf792d
1 changed files with 9 additions and 0 deletions
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9
Documentation/devicetree/bindings/mmc/mtk-sd.yaml
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@ -145,6 +145,15 @@ properties:
minimum: 0
maximum: 7
mediatek,tuning-step:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Some SoCs need extend tuning step for better delay value to avoid CRC issue.
If not present, default tuning step is 32. For eMMC and SD, this can yield
satisfactory calibration results in most cases.
enum: [32, 64]
default: 32
resets:
maxItems: 1