ludovic.desroches@xxxxxxxxx wrote on Friday, August 31, 2012 11:21 AM > From: Ludovic Desroches <ludovic.desroches@xxxxxxxxx> > > Some devices don't have clock streching in transmission mode. It can > lead to premature stop sendings if the latency to write data in the > transmission register is too long. In this case, prefer the i2c-gpio > driver. > > Signed-off-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxx> Acked-by: Nikolaus Voss <n.voss@xxxxxxxxxxx> > --- > drivers/i2c/busses/Kconfig | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig > index d9c4918..da77c37 100644 > --- a/drivers/i2c/busses/Kconfig > +++ b/drivers/i2c/busses/Kconfig > @@ -300,6 +300,12 @@ config I2C_AT91 > to support combined I2C messages. Use the i2c-gpio driver > unless your system can cope with this limitation. > > + Caution! at91rm9200, at91sam9261, at91sam9260, at91sam9263 > devices > + don't have clock stretching in transmission mode. For that reason, > + you can encounter underrun issues causing premature stop > sendings if > + the latency to fill the transmission register is too long. If you > + are facing this situation, use the i2c-gpio driver. > + > config I2C_AU1550 > tristate "Au1550/Au1200/Au1300 SMBus interface" > depends on MIPS_ALCHEMY > -- > 1.7.11.3 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
