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i2c: mux: Add more warnings to i2c-arb-gpio-challenge docs 

This adds some more warnings to the i2c-arb-gpio-challenge docs to
help encourage people not to use it in their designs unless they have
no choice.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Doug Anderson 2014-04-29 10:30:51 -07:00 committed by Wolfram Sang
parent 482116bada
commit a83bea7c11
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt
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@ -8,6 +8,12 @@ the standard I2C multi-master rules. Using GPIOs is generally useful in
the case where there is a device on the bus that has errata and/or bugs
that makes standard multimaster mode not feasible.
Note that this scheme works well enough but has some downsides:
* It is nonstandard (not using standard I2C multimaster)
* Having two masters on a bus in general makes it relatively hard to debug
problems (hard to tell if i2c issues were caused by one master, another, or
some device on the bus).
Algorithm: