From: Axe Yang <axe.yang@mediatek.com>
To: Chaotian Jing <chaotian.jing@mediatek.com>,
Ulf Hansson <ulf.hansson@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
"Wenbin Mei" <wenbin.mei@mediatek.com>
Cc: <linux-mmc@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-mediatek@lists.infradead.org>,
<Project_Global_Chrome_Upstream_Group@mediatek.com>,
Axe Yang <axe.yang@mediatek.com>
Subject: [PATCH v1 2/2] dt-bindings: mmc: mtk-sd: add 64-steps tuning related property
Date: Fri, 24 Nov 2023 15:08:39 +0800 [thread overview]
Message-ID: <20231124070839.12484-3-axe.yang@mediatek.com> (raw)
In-Reply-To: <20231124070839.12484-1-axe.yang@mediatek.com>
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@mediatek.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
next prev parent reply other threads:[~2023-11-24 7:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-24 7:08 [PATCH v1 0/2] mmc: mediatek: add support for complete clock cycle tuning Axe Yang
2023-11-24 7:08 ` [PATCH v1 1/2] mmc: mediatek: add support for 64-steps tuning Axe Yang
2023-11-29 1:39 ` Chaotian Jing (井朝天)
2023-11-24 7:08 ` Axe Yang [this message]
2023-11-24 8:24 ` [PATCH v1 2/2] dt-bindings: mmc: mtk-sd: add 64-steps tuning related property Krzysztof Kozlowski
2023-11-28 7:07 ` Axe Yang (杨磊)
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