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

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Message-ID: <20210406194856.GF3122@kunai>
Date:   Tue, 6 Apr 2021 21:48:56 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     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

On Sat, Mar 13, 2021 at 04:04:24PM +0800, qii.wang@...iatek.com wrote:
> From: Qii Wang <qii.wang@...iatek.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@...iatek.com>

I tried to understand from the code what the new binding expresses, but
I don't fully understand it. Is it the maximum clock stretch time?
Because I cannot recall a device which always uses the same delay for
clock stretching.


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