http://linux.die.net/man/3/strerror
On Thu, Aug 18, 2016 at 9:03 PM, Jane <[email protected]> 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]. > 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/CALHSORr1LAWyEa82GS2C%3DY2ugyveVTNhN7Z1KMf8YYua-n7cQw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
