From: Wolfram Sang <wsa@the-dreams.de>
To: Qii Wang <qii.wang@mediatek.com>
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: Wed, 7 Apr 2021 20:19:36 +0200 [thread overview]
Message-ID: <20210407181936.GA1614@kunai> (raw)
In-Reply-To: <1617797706.32076.1.camel@mhfsdcap03>
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> 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.
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WARNING: multiple messages have this Message-ID (diff)
From: Wolfram Sang <wsa@the-dreams.de>
To: Qii Wang <qii.wang@mediatek.com>
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: Wed, 7 Apr 2021 20:19:36 +0200 [thread overview]
Message-ID: <20210407181936.GA1614@kunai> (raw)
In-Reply-To: <1617797706.32076.1.camel@mhfsdcap03>
[-- Attachment #1.1: Type: text/plain, Size: 390 bytes --]
> 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.
[-- Attachment #1.2: signature.asc --]
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_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
WARNING: multiple messages have this Message-ID (diff)
From: Wolfram Sang <wsa@the-dreams.de>
To: Qii Wang <qii.wang@mediatek.com>
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: Wed, 7 Apr 2021 20:19:36 +0200 [thread overview]
Message-ID: <20210407181936.GA1614@kunai> (raw)
In-Reply-To: <1617797706.32076.1.camel@mhfsdcap03>
[-- Attachment #1.1: Type: text/plain, Size: 390 bytes --]
> 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.
[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
[-- Attachment #2: Type: text/plain, Size: 176 bytes --]
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-04-07 18:19 UTC|newest]
Thread overview: 24+ 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
2021-03-13 8:04 ` qii.wang
2021-03-13 8:04 ` qii.wang
2021-03-18 11:23 ` Wolfram Sang
2021-03-18 11:23 ` Wolfram Sang
2021-03-18 11:23 ` Wolfram Sang
2021-04-06 19:48 ` Wolfram Sang
2021-04-06 19:48 ` Wolfram Sang
2021-04-06 19:48 ` Wolfram Sang
2021-04-07 12:15 ` Qii Wang
2021-04-07 12:15 ` Qii Wang
2021-04-07 12:15 ` Qii Wang
2021-04-07 18:19 ` Wolfram Sang [this message]
2021-04-07 18:19 ` Wolfram Sang
2021-04-07 18:19 ` Wolfram Sang
2021-04-12 12:03 ` Qii Wang
2021-04-12 12:03 ` Qii Wang
2021-04-12 12:03 ` Qii Wang
2021-04-13 20:17 ` Wolfram Sang
2021-04-13 20:17 ` Wolfram Sang
2021-04-13 20:17 ` Wolfram Sang
2021-04-14 1:37 ` Qii Wang
2021-04-14 1:37 ` Qii Wang
2021-04-14 1:37 ` Qii Wang
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