diff options
| author | Doug Anderson <dianders@chromium.org> | 2014-04-29 13:30:51 -0400 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-05-22 04:09:22 -0400 |
| commit | a83bea7c1170ad8c68d65ed2fff6a533e68f67a4 (patch) | |
| tree | 0bf15296942f62d84c0e67be5622b316eaa5e388 | |
| parent | 482116badacba9308abd6c5cae2f5f19e2f81449 (diff) | |
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>
| -rw-r--r-- | Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt b/Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt index 1ac8ea8ade1d..bfeabb843941 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 | |||
| 8 | the case where there is a device on the bus that has errata and/or bugs | 8 | the case where there is a device on the bus that has errata and/or bugs |
| 9 | that makes standard multimaster mode not feasible. | 9 | that makes standard multimaster mode not feasible. |
| 10 | 10 | ||
| 11 | Note that this scheme works well enough but has some downsides: | ||
| 12 | * It is nonstandard (not using standard I2C multimaster) | ||
| 13 | * Having two masters on a bus in general makes it relatively hard to debug | ||
| 14 | problems (hard to tell if i2c issues were caused by one master, another, or | ||
| 15 | some device on the bus). | ||
| 16 | |||
| 11 | 17 | ||
| 12 | Algorithm: | 18 | Algorithm: |
| 13 | 19 | ||