linux-kernel - Re: [RESEND] i2c: mediatek: Get device clock-stretch time via dts

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Message-ID: <20210407181936.GA1614@kunai>
Date:   Wed, 7 Apr 2021 20:19:36 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Qii Wang <qii.wang@...iatek.com>
Cc:     matthias.bgg@...il.com, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        leilk.liu@...iatek.com
Subject: Re: [RESEND] i2c: mediatek: Get device clock-stretch time via dts


> 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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