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Commit 24d0fb42 authored by David Brownell's avatar David Brownell Committed by Jean Delvare
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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: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 08fb68bb

drivers/i2c/busses/Kconfig

+9 −1
Original line number Diff line number Diff line
@@ -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