diff options
| author | David Brownell <david-b@pacbell.net> | 2007-10-13 23:56:32 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@hyperion.delvare> | 2007-10-13 23:56:32 +0200 |
| commit | 24d0fb423ca18adf509dec8a7326c0bdd6653e41 (patch) | |
| tree | fa6db5f0dca5f0a2844de560ca0086740f0a9627 | |
| parent | 08fb68bb4bbc9c5970e4ed4920cb6144a70684cd (diff) | |
i2c-at91: Mark as broken
Mark the i2c-at91 driver BROKEN in Kconfig, and explain just
why it's broken. (Summary: hardware design issues.)
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
| -rw-r--r-- | drivers/i2c/busses/Kconfig | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index a9cab3e5b8b..de95c75efb4 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -75,11 +75,19 @@ config I2C_AMD8111 config I2C_AT91 tristate "Atmel AT91 I2C Two-Wire interface (TWI)" - depends on ARCH_AT91 && EXPERIMENTAL + depends on ARCH_AT91 && EXPERIMENTAL && BROKEN help This supports the use of the I2C interface on Atmel AT91 processors. + This driver is BROKEN because the controller which it uses + will easily trigger RX overrun and TX underrun errors. Using + low I2C clock rates may partially work around those issues + on some systems. Another serious problem is that there is no + documented way to issue repeated START conditions, as needed + to support combined I2C messages. Use the i2c-gpio driver + unless your system can cope with those limitations. + config I2C_AU1550 tristate "Au1550/Au1200 SMBus interface" depends on SOC_AU1550 || SOC_AU1200 |