[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20231130061513.1296-2-axe.yang@mediatek.com>
Date: Thu, 30 Nov 2023 14:15:12 +0800
From: Axe Yang <axe.yang@...iatek.com>
To: Chaotian Jing <chaotian.jing@...iatek.com>,
Ulf Hansson <ulf.hansson@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
"Wenbin Mei" <wenbin.mei@...iatek.com>
CC: <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>,
<Project_Global_Chrome_Upstream_Group@...iatek.com>,
Axe Yang <axe.yang@...iatek.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v3 1/2] 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@...aro.org>
Signed-off-by: Axe Yang <axe.yang@...iatek.com>
---
Documentation/devicetree/bindings/mmc/mtk-sd.yaml | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
index 3fffa467e4e1..c532ec92d2d9 100644
--- a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
+++ b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
@@ -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
--
2.25.1
Powered by blists - more mailing lists