Hi, On Thu, Sep 19, 2013 at 06:38:13PM +0530, George Cherian wrote: > On 9/19/2013 6:14 PM, Felipe Balbi wrote: > >Hi, > > > >On Thu, Sep 19, 2013 at 01:43:41PM +0530, George Cherian wrote: > >>On 9/18/2013 11:06 PM, Felipe Balbi wrote: > >>>Hi, > >>> > >>>On Wed, Sep 18, 2013 at 07:18:04PM +0200, Laurent Pinchart wrote: > >>>>On Wednesday 18 September 2013 13:16:27 Linus Walleij wrote: > >>>>>On Tue, Sep 17, 2013 at 9:07 PM, Felipe Balbi <balbi@xxxxxx> wrote: > >>>>>>has anyone ever successfully using gpio-pcf857x.c driver with 16-bit > >>>>>>gpio expanders ? We're having some issues here where toggling the last > >>>>>>gpio pin (gpio 15) on a PCF8575 device causes platform to hang and I > >>>>>>can't come up with any explanation of why would it hang... > >>>>>Bouncing the question to George, Laurent and Kuninori... > >>>>I've got a board with a PCF8575 chip, but it uses I/Os 8 to 14 only as far as > >>>>I know. > >>>> > >>>>I can try toggling I/O 15, but that will need to wait until next week as I'm > >>>>currently travelling without access to the hardware. > >>>alright, that'd help me a lot :-) Just want to make sure if we're having > >>>a board issue, or PCF8575 is a bit screwy ;-) > >>Is it on dra7x-evm if so which pcf device (i2c address)? > >0x21 IIRC, it's pin 15 on that goes to a discrete mux. I want to toggle > >the mux ;-) > > > I am able to toggle the same via sysfs(pcf8575 @ 0x21gpio15(p17)) and > it does not hang the board. > I am using Rev D1 board. > > Log :- > # cat /sys/kernel/debug/gpio > . > ... > GPIOs 480-495, i2c/0-0021, pcf8575, can sleep: > gpio-481 (id_gpio ) in hi > gpio-482 (id_gpio ) in hi > gpio-495 (sysfs ) out hi > # echo 0 > /sys/class/gpio/gpio495/value > # cat /sys/kernel/debug/gpio > . > ... > GPIOs 480-495, i2c/0-0021, pcf8575, can sleep: > gpio-481 (id_gpio ) in hi > gpio-482 (id_gpio ) in hi > gpio-495 (sysfs ) out lo weird... I'll debug here and see if I can still reproduce with v3.12-rc1. Thanks anyway :-) cheers -- balbi
Attachment:
signature.asc
Description: Digital signature
