linux-kernel - [PATCH 1/2] dt-bindings: mmc: mtk-sd: add single burst switch

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Message-ID: <20250306085028.5024-2-axe.yang@mediatek.com>
Date: Thu, 6 Mar 2025 16:48:05 +0800
From: Axe Yang <axe.yang@...iatek.com>
To: Chaotian Jing <chaotian.jing@...iatek.com>, Ulf Hansson
	<ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
	<krzk+dt@...nel.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: <yong.mao@...iatek.com>, <qingliang.li@...iatek.com>,
	<andy-ld.lu@...iatek.com>, <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>,
	Axe Yang <axe.yang@...iatek.com>
Subject: [PATCH 1/2] dt-bindings: mmc: mtk-sd: add single burst switch

Add 'mediatek,disable-single-burst' setting. This property can be
used to switch bus burst type, from single burst to INCR, which is
determined by the bus type within the IP. Some versions of the IP
are using AXI bus, thus this switch is necessary as 'single' is not
the burst type supported by the bus.

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 0debccbd6519..6076aff0a689 100644
--- a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
+++ b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
@@ -100,6 +100,14 @@ properties:
     minimum: 0
     maximum: 0xffffffff
 
+  mediatek,disable-single-burst:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Burst type setting. For some versions of the IP that do not use
+      AHB bus, the burst type need to be switched to INCR.
+      If present, use INCR burst type.
+      If not present, use single burst type.
+
   mediatek,hs200-cmd-int-delay:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:
-- 
2.46.0