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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2014-06-17 22:16:07 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2014-06-19 09:41:51 +0200 |
| commit | 9313920df6d3d55fbd03ce8ec1c0da9a10c29824 (patch) | |
| tree | ef80d80abbaf46293b777ead52caddd9d5d97644 /dts/Bindings/i2c/i2c-arb-gpio-challenge.txt | |
| parent | 83e875e1f45beffe399cff0ff6128e0fca9da168 (diff) | |
| download | barebox-9313920df6d3d55fbd03ce8ec1c0da9a10c29824.tar.gz barebox-9313920df6d3d55fbd03ce8ec1c0da9a10c29824.tar.xz | |
dts: update to v3.16-rc1
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'dts/Bindings/i2c/i2c-arb-gpio-challenge.txt')
| -rw-r--r-- | dts/Bindings/i2c/i2c-arb-gpio-challenge.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/dts/Bindings/i2c/i2c-arb-gpio-challenge.txt b/dts/Bindings/i2c/i2c-arb-gpio-challenge.txt index 1ac8ea8ade..bfeabb8439 100644 --- a/dts/Bindings/i2c/i2c-arb-gpio-challenge.txt +++ b/dts/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: |