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Commit a83bea7c authored by Doug Anderson's avatar Doug Anderson Committed by Wolfram Sang
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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: default avatarDoug Anderson <dianders@chromium.org>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 482116ba

Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt

+6 −0
Original line number Diff line number Diff line
@@ -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: