Part Number: AM625
Hello,
If i configure any gpio in INPUT mode in dts, then i can access it from /sys/class/gpio/ and though export method. (configuring it input or output in export direction.)
But if i configure gpio in OUTPUT mode in dts, then gpio can not be set from /sys/class/gpio.
GPIO device tree entries are as per below...
&main_pmx0 {
main_gpio0_pins_default: main-gpio0-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x0044, PIN_OUTPUT, 7) /* (N24) GPMC0_AD2.GPIO0_17 */
AM62X_IOPAD(0x0048, PIN_INPUT, 7) /* (N25) GPMC0_AD3.GPIO0_18 */
>;
};
};
&main_gpio0 {
pinctrl-names = "default";
pinctrl-0 = <&main_gpio0_pins_default>;
};
getting output like below.
root@sm2s-am6254:/sys/class/gpio# echo 416 > export root@sm2s-am6254:/sys/class/gpio# echo out > gpio416/direction root@sm2s-am6254:/sys/class/gpio# echo 1 > gpio416/value root@sm2s-am6254:/sys/class/gpio# cat gpio416/value 0 root@sm2s-am6254:/sys/class/gpio# echo 1 > gpio416/value root@sm2s-am6254:/sys/class/gpio# cat gpio416/value 0 root@sm2s-am6254:/sys/class/gpio# root@sm2s-am6254:/sys/class/gpio# root@sm2s-am6254:/sys/class/gpio# echo 417 > export root@sm2s-am6254:/sys/class/gpio# echo out > gpio417/direction root@sm2s-am6254:/sys/class/gpio# echo 1 > gpio417/value root@sm2s-am6254:/sys/class/gpio# cat gpio417/value 1 root@sm2s-am6254:/sys/class/gpio# echo 0 > gpio417/value root@sm2s-am6254:/sys/class/gpio# cat gpio417/value 0
How can we control gpios in OUTPUT mode runtimes in any kernel driver or user space?
