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From: Krzysztof Halasa <khc@pm.waw.pl>
To: "Mark M. Hoffman" <mhoffman@lightlink.com>
Cc: linux-kernel@vger.kernel.org, lm-sensors@lm-sensors.org
Subject: Re: [lm-sensors] [PATCH] I2C: i2c_bit_add_bus should initialize SDA and SCL lines
Date: Mon, 12 Jun 2006 19:13:38 +0200	[thread overview]
Message-ID: <m3hd2q47r1.fsf@defiant.localdomain> (raw)
In-Reply-To: <20060612123626.GA27429@jupiter.solarsys.private> (Mark M. Hoffman's message of "Mon, 12 Jun 2006 08:36:26 -0400")

Hi,

"Mark M. Hoffman" <mhoffman@lightlink.com> writes:

> If you can't read the line state... well, that's not actually a proper
> I2C bus anyway.

Actually you only have to be able to read SDA state, it might not be
true WRT SCL. I think most implementations use a single master and
a fixed access timing and thus only read SDA (SCL can as well be
a simple 2-state normal output from master instead of open
drain/collector or 3-state).

I'm not sure initializing the bus (in terms of ~ handshaking)
belongs to hw driver and not to the algorithm but such is live.

Thanks.
-- 
Krzysztof Halasa

      reply	other threads:[~2006-06-12 17:13 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-06-06 16:58 Krzysztof Halasa
2006-06-09 11:05 ` [lm-sensors] " Mark M. Hoffman
2006-06-10 22:27   ` Krzysztof Halasa
2006-06-12 12:36     ` Mark M. Hoffman
2006-06-12 17:13       ` Krzysztof Halasa [this message]

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