linux-kernel - Re: [PATCH v2 1/4] i2c/busses: Add i2c-icy for I2C on m68k/Amiga

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Message-ID: <20190815114809.GA1916@kunai>
Date:   Thu, 15 Aug 2019 13:48:09 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Max Staudt <max@...as.org>
Cc:     linux-i2c@...r.kernel.org, linux-hwmon@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>, linux-m68k@...r.kernel.org,
        linux-kernel@...r.kernel.org, glaubitz@...sik.fu-berlin.de
Subject: Re: [PATCH v2 1/4] i2c/busses: Add i2c-icy for I2C on m68k/Amiga


> Well, the other option is to remove it, and then add it back once
> somebody complains - which is unlikely to happen. The clock parameter
> is PCF8584 specific anyway, and  I think removing it is a good option,

My suggestion is to do that incrementally. First, get your driver
accepted. Second, do the cleanups which affect elektor as well later.

> as I've done the same with getown() (where in i2c-elektor, 'own' sets
> the PCF8584's own address).

I wondered about that. Can the PCF8584 really act as a slave, too?
Somewhen I need to check its datasheet.

> Question is, if I remove the parameter, I'd like it to be
> non-destructive. Do you know of anything that can go wrong if the I2C
> master is running the bus on a wrong clock?

Not sure if I understand you correctly, but if the bus freq is too fast
then devices won't respond. Too slow is not a problem.


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