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

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Message-ID: <20210324171217.GA3262580@robh.at.kernel.org>
Date:   Wed, 24 Mar 2021 11:12:17 -0600
From:   Rob Herring <robh@...nel.org>
To:     qii.wang@...iatek.com
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
Subject: Re: [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts

On Sat, Mar 13, 2021 at 04:07:09PM +0800, qii.wang@...iatek.com wrote:
> 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.

Should be a common I2C property?

>  
>  Example:
>  
> -- 
> 1.9.1
>