On 19/09/13 13:20, George Cherian wrote: > On 9/19/2013 5:37 PM, Nishanth Menon wrote: >> On 09/19/2013 03:13 AM, 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)? >>> The pins i were interested were only 1 and 2 I never tried pin 15. >>> >>> Just tried toggling through sysfs and it works for me. >> When I look at the data sheet for PCF8575[1] Page 7, Figure 4 Write >> mode (output) >> I see the data writes are of the order: >> I2c 1's byte: address >> I2c 2'nd byte:P[7-0] >> I2c 3rd byte:P[17-10] > > I read it as an octal numbering. Kind of ... looking at the pinout, you have pins:- P00...P07 P10...P17 So that's Port 0, bits 0..7, and Port 1, bits 0..7. Mark J. -- 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
