Messages in this thread Patch in this message | | | From | Doug Anderson <> | Subject | [PATCH] i2c: mux: Add more warnings to i2c-arb-gpio-challenge docs | Date | Tue, 29 Apr 2014 10:30:51 -0700 |
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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> --- Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt b/Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt index 1ac8ea8..bfeabb8 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt @@ -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: -- 1.9.1.423.g4596e3a
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