From: Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
To: "Svenning Sørensen" <sss-sijd2F9aCfdBDgjK7y7TUQ@public.gmane.org>
Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] i2c: scx200_acb: avoid I2C bus overclocking.
Date: Tue, 12 May 2015 22:19:20 +0200 [thread overview]
Message-ID: <20150512201919.GL4449@schokonusskuchen.bad> (raw)
In-Reply-To: <553955C6.3030000-sijd2F9aCfdBDgjK7y7TUQ@public.gmane.org>
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On Thu, Apr 23, 2015 at 10:27:50PM +0200, Svenning Sørensen wrote:
> According to I2C spec, max SCL rate is 100 kHz, but SCx200/CS5536
> controller is currently driving it at 214 kHz according to my math.
>
> SCL is derived from an input clock of 48 MHz, which must be divided
> by 480 (240 cycles for each SCL high/low state) to be within spec.
>
> Signed-off-by: Svenning Soerensen <sss-sijd2F9aCfdBDgjK7y7TUQ@public.gmane.org>
So, did you test/measure the actual frequency? Or is this patch based on
specs only? Thanks for caring about this old driver, though!
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next prev parent reply other threads:[~2015-05-12 20:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-23 20:27 [PATCH] i2c: scx200_acb: avoid I2C bus overclocking Svenning Sørensen
[not found] ` <553955C6.3030000-sijd2F9aCfdBDgjK7y7TUQ@public.gmane.org>
2015-05-12 20:19 ` Wolfram Sang [this message]
[not found] ` <20150512201919.GL4449-oo5tB6JMkjKRinMKxDlMNPwbnWRJjS81@public.gmane.org>
2015-05-12 21:09 ` Svenning Sørensen
2015-06-02 18:21 ` Wolfram Sang
2015-10-25 15:47 ` Wolfram Sang
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