On Tue, 2021-04-13 at 22:17 +0200, Wolfram Sang wrote:
> On Mon, Apr 12, 2021 at 08:03:14PM +0800, Qii Wang wrote:
> > I can't see the relationship between "i2c-scl-falling-time-ns" and clock
> > stretching, is there a parameter related to clock stretching?
>
> ( you wrote
On Mon, Apr 12, 2021 at 08:03:14PM +0800, Qii Wang wrote:
> On Wed, 2021-04-07 at 20:19 +0200, Wolfram Sang wrote:
> > > Due to clock stretch, our HW IP cannot meet the ac-timing
> > > spec(tSU;STA,tSU;STO).
> > > There isn't a same delay for clock stretching, so we need pass a
> > > parameter
On Wed, 2021-04-07 at 20:19 +0200, Wolfram Sang wrote:
> > Due to clock stretch, our HW IP cannot meet the ac-timing
> > spec(tSU;STA,tSU;STO).
> > There isn't a same delay for clock stretching, so we need pass a
> > parameter which can be found through measurement to meet most
> > conditions.
>
> Due to clock stretch, our HW IP cannot meet the ac-timing
> spec(tSU;STA,tSU;STO).
> There isn't a same delay for clock stretching, so we need pass a
> parameter which can be found through measurement to meet most
> conditions.
What about using this existing binding?
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On Tue, 2021-04-06 at 21:48 +0200, Wolfram Sang wrote:
> On Sat, Mar 13, 2021 at 04:04:24PM +0800, qii.w...@mediatek.com wrote:
> > From: Qii Wang
> >
> > 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
On Sat, Mar 13, 2021 at 04:04:24PM +0800, qii.w...@mediatek.com wrote:
> From: Qii Wang
>
> 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
> 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
I will look at this next and think about it. New
From: Qii Wang
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
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drivers/i2c/busses/i2c-mt65xx.c | 6 +-
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