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

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Message-ID: <20231124070839.12484-3-axe.yang@mediatek.com>
Date:   Fri, 24 Nov 2023 15:08:39 +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>
Subject: [PATCH v1 2/2] dt-bindings: mmc: mtk-sd: add 64-steps tuning related property

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@...iatek.com>
---
 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