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authorDavid Brownell <david-b@pacbell.net>2007-10-13 17:56:32 -0400
committerJean Delvare <khali@hyperion.delvare>2007-10-13 17:56:32 -0400
commit24d0fb423ca18adf509dec8a7326c0bdd6653e41 (patch)
treefa6db5f0dca5f0a2844de560ca0086740f0a9627 /drivers/i2c/busses
parent08fb68bb4bbc9c5970e4ed4920cb6144a70684cd (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>
Diffstat (limited to 'drivers/i2c/busses')
-rw-r--r--drivers/i2c/busses/Kconfig10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index a9cab3e5b8bd..de95c75efb41 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -75,11 +75,19 @@ config I2C_AMD8111
75 75
76config I2C_AT91 76config I2C_AT91
77 tristate "Atmel AT91 I2C Two-Wire interface (TWI)" 77 tristate "Atmel AT91 I2C Two-Wire interface (TWI)"
78 depends on ARCH_AT91 && EXPERIMENTAL 78 depends on ARCH_AT91 && EXPERIMENTAL && BROKEN
79 help 79 help
80 This supports the use of the I2C interface on Atmel AT91 80 This supports the use of the I2C interface on Atmel AT91
81 processors. 81 processors.
82 82
83 This driver is BROKEN because the controller which it uses
84 will easily trigger RX overrun and TX underrun errors. Using
85 low I2C clock rates may partially work around those issues
86 on some systems. Another serious problem is that there is no
87 documented way to issue repeated START conditions, as needed
88 to support combined I2C messages. Use the i2c-gpio driver
89 unless your system can cope with those limitations.
90
83config I2C_AU1550 91config I2C_AU1550
84 tristate "Au1550/Au1200 SMBus interface" 92 tristate "Au1550/Au1200 SMBus interface"
85 depends on SOC_AU1550 || SOC_AU1200 93 depends on SOC_AU1550 || SOC_AU1200