anilrockstar
Newbie level 3
Hi everyone.
I want to learn custom device driver in Arm Borad device . i have using Rasberry pi 3b+. and import kernel from kernel.and modifiy kernel by documation givern instruction by link.
https://www.raspberrypi.org/documentation/linux/kernel/building.md
and i have modify dts file bcm2710_rpi_3b_plus.dts file and compile.
and i have written demo code for driver and insert by insmod command , but led not blinking.
I want to learn custom device driver in Arm Borad device . i have using Rasberry pi 3b+. and import kernel from kernel.and modifiy kernel by documation givern instruction by link.
https://www.raspberrypi.org/documentation/linux/kernel/building.md
and i have modify dts file bcm2710_rpi_3b_plus.dts file and compile.
Code:
&gpio {
sdhost_pins: sdhost_pins {
brcm,pins = <48 49 50 51 52 53>;
brcm,function = <4>; /* alt0 */
};
[...]
led_pins: led_pins {
brcm,pins = <27 22 26>;
brcm,function = <1>; /* Output */
brcm,pull = <1 1 1>; /* Pull down */
};
};
&soc {
virtgpio: virtgpio {
compatible = "brcm,bcm2835-virtgpio";
gpio-controller;
#gpio-cells = <2>;
firmware = <&firmware>;
status = "okay";
expgpio: expgpio {
compatible = "brcm,bcm2835-expgpio";
gpio-controller;
#gpio-cells = <2>;
firmware = <&firmware>;
status = "okay";
};
ledred
};
{
compatible = "arrow,RGBleds";
label = "ledred";
pinctrl-0 = <&led_pins>;
ledgreen {
compatible = "arrow,RGBleds";
label = "ledgreen";
};
ledblue {
compatible = "arrow,RGBleds";
label = "ledblue";
};
[...]
};and i have written demo code for driver and insert by insmod command , but led not blinking.