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

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Date:   Fri, 26 Mar 2021 09:30:52 +0800
From:   Qii Wang <qii.wang@...iatek.com>
To:     Rob Herring <robh@...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>
Subject: Re: [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts

On Wed, 2021-03-24 at 11:12 -0600, Rob Herring wrote:
> 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?
> 

Wolfram Sang will look at this next and think about it. I hope it would
be a common I2C property.

> >  
> >  Example:
> >  
> > -- 
> > 1.9.1
> >