| Message ID | 1615622829-15167-1-git-send-email-qii.wang@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | dt-bindings: i2c: Add device clock-stretch time via dts | expand |
On Sat, Mar 13, 2021 at 04:07:09PM +0800, qii.wang@mediatek.com wrote: > From: Qii Wang <qii.wang@mediatek.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@mediatek.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 >
On Wed, 2021-03-24 at 11:12 -0600, Rob Herring wrote: > On Sat, Mar 13, 2021 at 04:07:09PM +0800, qii.wang@mediatek.com wrote: > > From: Qii Wang <qii.wang@mediatek.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@mediatek.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 > >
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: