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
leds-ns2.c (9.97 KB)