* [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts
@ 2021-03-13 8:07 qii.wang
2021-03-24 17:12 ` Rob Herring
0 siblings, 1 reply; 3+ messages in thread
From: qii.wang @ 2021-03-13 8:07 UTC (permalink / raw)
To: robh+dt
Cc: matthias.bgg, wsa, devicetree, linux-arm-kernel, linux-kernel,
linux-mediatek, srv_heupstream, leilk.liu, qii.wang
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.
Example:
--
1.9.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts
2021-03-13 8:07 [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts qii.wang
@ 2021-03-24 17:12 ` Rob Herring
2021-03-26 1:30 ` Qii Wang
0 siblings, 1 reply; 3+ messages in thread
From: Rob Herring @ 2021-03-24 17:12 UTC (permalink / raw)
To: qii.wang
Cc: matthias.bgg, wsa, devicetree, linux-arm-kernel, linux-kernel,
linux-mediatek, srv_heupstream, leilk.liu
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
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts
2021-03-24 17:12 ` Rob Herring
@ 2021-03-26 1:30 ` Qii Wang
0 siblings, 0 replies; 3+ messages in thread
From: Qii Wang @ 2021-03-26 1:30 UTC (permalink / raw)
To: Rob Herring
Cc: matthias.bgg, wsa, devicetree, linux-arm-kernel, linux-kernel,
linux-mediatek, srv_heupstream, leilk.liu
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
> >
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-03-13 8:07 [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts qii.wang
2021-03-24 17:12 ` Rob Herring
2021-03-26 1:30 ` Qii Wang
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