Thread (4 messages) flat view 4 messages, 3 authors, 2010-09-22
STALE5806d

[PATCH] at91sam9g45: fix i2c bus speed

From: Wolfgang Wegner <hidden>
Date: 2010-09-22 14:54:42

Hi,

On Wed, Sep 22, 2010 at 04:34:06PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
On 13:08 Wed 22 Sep     , Peter Korsgaard wrote:
[...]
quoted
Now, I agree that it would be nice to add an interface to tweak this
delay if needed (extra argument to at91_add_device_i2c()?), but that's
next to the discussion about what the default should be.
I'd prefer to calculate it

so we specify which max freq we want in my mind it will be good to be as in
spi to specific per device it's max speed so we can adapt the bus freq
sorry in case I got you wrong, but please keep in mind that in
contrast to SPI the addressing in I2C is done via the serial data,
so the bus speed has to be _permanently_ adapted to match the
slowest device present.

Regards,
Wolfgang
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