Thanks , I figured it out ! I was not putting the valid gpio in the <&gpio0 <here> 0>
On Friday, August 19, 2016 at 2:45:03 PM UTC+5:30, William Hermans wrote: > > http://linux.die.net/man/3/strerror > > On Thu, Aug 18, 2016 at 9:03 PM, Jane <[email protected] <javascript:>> > wrote: > >> Hello, >> >> This topic is not solely related to beagleboneBlack , still posting on >> this group . >> >> With reference to the example below what is the correct way to get the >> gpio values from the device tree : >> >> I modified the existing leds-ns2 device tree as below(slow1 ,cmd1) : >> >> >> blue-sata { >> >> label = "ns2:blue:sata"; >> >> slow-gpio = <&gpio0 29 0>; >> >> cmd-gpio = <&gpio0 30 0>; >> >> + slow1-gpio=<&gpio 31 0>; >> >> + cmd1-gpio=<&gpio 32 0>; >> >> modes-map = <NS_V2_LED_OFF 0 1 >> >> NS_V2_LED_ON 1 0 >> >> NS_V2_LED_ON 0 0 >> >> NS_V2_LED_SATA 1 1>; >> >> }; >> >> >> >> >> >> And modified the driver by adding slow1 and cmd1 in all the structure >> (just like slow and cmd) in the attached leds-ns2.c driver >> >> But when I am trying to get the gpio number for slow1 and cmd1 I am >> getting the below error(number gpio #31 and 32 are random numbers of gpio >> for testing, does it matters?) : >> >> error : leds-ns2:probe of ns2-leds failed with error -2.What does error >> code -2 represents ?Is this a device tree parsing error? >> >> ret = of_get_named_gpio(child, "slow1-gpio", 0); >> >> if (ret < 0) >> >> return ret; >> >> same error if I try to get the cmd1-gpio . >> >> >> Thanks in advance ! >> >> Regards, >> >> Rp >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/4f1ce45b-5a75-4152-a93d-ea33f2df87bc%40googlegroups.com >> >> <https://groups.google.com/d/msgid/beagleboard/4f1ce45b-5a75-4152-a93d-ea33f2df87bc%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/c0af2a4f-0c29-4d7e-9527-d5636a0450f5%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
