Lee, On 04/01/2014 04:44 PM, Peter Ujfalusi wrote: > Hi, > > While looking into a report by Florian Vaussard [1] I have noticed couple of most > likely unrelated issues: > - all boards using twl6040 configures the i2c bus to 400KHz while twl6040 is set > to 100KHz as default. > - if I set the audpwron GPIO high [2] in the bootloader the i2c communication towards > twl6040 will be broken > - got confirmation from HW design teams that twl6040 can work on a bus with > 400KHz even if after hard reset but it is optimal to swithc to 400KHz mode as > soon as possible. > > The solution or these are: > set the twl6040 to i2c fast mode with regmap patch > Clear the INTID register right after we request the audpwron GPIO and set it to > low. Do you want me to resend this series again? Thanks, Péter > > Generated on top of: > git://git.linaro.org/people/lee.jones/mfd.git for-mfd-next > > Tested on PandaBoard, PandaBoardES, OMAP4-blaze (SDP) > > [1] http://www.spinics.net/lists/arm-kernel/msg310725.html > [2] Command in u-boot to enable the audpwron on PandaBoards: gpio set 127 > > Regards, > Peter > --- > Peter Ujfalusi (3): > mfd: twl6040: Select i2c fast mode as default with regmap patch > mfd: twl6040: Move register patching earlier in probe > mfd: twl6040: Clear the interrupt ID register before requesting IRQ > > drivers/mfd/twl6040.c | 19 +++++++++++++------ > include/linux/mfd/twl6040.h | 1 + > 2 files changed, 14 insertions(+), 6 deletions(-) > -- 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
