On Mon, 17 Jan 2011, Santosh Shilimkar wrote: > The I2C timeout issue I could reproduce on my ES1.0 board. It's ES1.0 > specific issue because I2C burst mode wasn't fuctional on it. Twl RTC > driver uses I2C burst mode and hence it times out. Other TWL I2C > module has no such issue. > The pull work-around we tried was not reliable hence it was dropped. > > In short the TWL RTC driver won't function on ES1.0. Apart from that > rest of the I2C clients should work as usual. Looks like the IRQ handling code uses it too: $ egrep -r 'twl_i2c_(write|read)\(' drivers/ | egrep -v twl-core | egrep -v 4030 drivers/mfd/twl6030-irq.c: ret = twl_i2c_read(TWL_MODULE_PIH, sts.bytes, drivers/mfd/twl6030-irq.c: ret = twl_i2c_write(TWL_MODULE_PIH, sts.bytes, drivers/mfd/twl6030-irq.c: ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0], drivers/mfd/twl6030-irq.c: ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0], drivers/mfd/twl6030-irq.c: ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0], drivers/rtc/rtc-twl.c: ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data, drivers/rtc/rtc-twl.c: ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data, drivers/rtc/rtc-twl.c: ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data, drivers/rtc/rtc-twl.c: ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data, $ I'd assume this also would affect other, non-TWL, I2C endpoints, no? Sounds like a platform_data flag should be passed into the I2C driver code to indicate that burst transactions are buggy on OMAP4430ES1. - Paul -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html