linux-kernel - [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts

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Date:   Sat, 13 Mar 2021 16:07:09 +0800
From:   <qii.wang@...iatek.com>
To:     <robh+dt@...nel.org>
CC:     <matthias.bgg@...il.com>, <wsa@...-dreams.de>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <leilk.liu@...iatek.com>,
        <qii.wang@...iatek.com>
Subject: [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts

From: Qii Wang <qii.wang@...iatek.com>

tSU,STA/tHD,STA/tSU,STOP maybe out of spec due to device
clock-stretching or circuit loss, we could get device
clock-stretch time from dts to adjust these parameters
to meet the spec via EXT_CONF register.

Signed-off-by: Qii Wang <qii.wang@...iatek.com>
---
 Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
index 7f0194f..97f66f0 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
@@ -32,6 +32,7 @@ Optional properties:
   - mediatek,have-pmic: platform can control i2c form special pmic side.
     Only mt6589 and mt8135 support this feature.
   - mediatek,use-push-pull: IO config use push-pull mode.
+  - clock-stretch-ns: Slave device clock-stretch time.
 
 Example:
 
-- 
1.9.1