From: Qii Wang <qii.wang@mediatek.com>
To: Wolfram Sang <wsa@the-dreams.de>
Cc: <matthias.bgg@gmail.com>, <linux-i2c@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>,
<linux-mediatek@lists.infradead.org>,
<srv_heupstream@mediatek.com>, <leilk.liu@mediatek.com>
Subject: Re: [RESEND] i2c: mediatek: Get device clock-stretch time via dts
Date: Mon, 12 Apr 2021 20:03:14 +0800 [thread overview]
Message-ID: <1618228994.32225.3.camel@mhfsdcap03> (raw)
In-Reply-To: <20210407181936.GA1614@kunai>
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.
>
> What about using this existing binding?
>
> - i2c-scl-internal-delay-ns
> Number of nanoseconds the IP core additionally needs to setup SCL.
>
I can't see the relationship between "i2c-scl-falling-time-ns" and clock
stretching, is there a parameter related to clock stretching?
If you think both of them will affect the ac-timing of SCL, at this
point, "i2c-scl-falling-time-ns" maybe a good choice.
next prev parent reply other threads:[~2021-04-12 12:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-13 8:04 [RESEND] i2c: mediatek: Get device clock-stretch time via dts qii.wang
2021-03-18 11:23 ` Wolfram Sang
2021-04-06 19:48 ` Wolfram Sang
2021-04-07 12:15 ` Qii Wang
2021-04-07 18:19 ` Wolfram Sang
2021-04-12 12:03 ` Qii Wang [this message]
2021-04-13 20:17 ` Wolfram Sang
2021-04-14 1:37 ` Qii Wang
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