Compile Device Tree Overlay

[kampi]

Hi,

 

I use kernel version 4.19.62-sunxi on my Orange Pi One and I want compile the following devide tree overlay:

 

/dts-v1/;
/plugin/;

/ {
	compatible = "allwinner,sun4i-a10", "allwinner,sun7i-a20", "allwinner,sun8i-h3", "allwinner,sun50i-a64", "allwinner,sun50i-h5";

	fragment@0 {
		target = <&pio>;
		__overlay__ {
			gpio_button_0: gpio_button_0 {
				pins = "PA20";
				function = "gpio_in";
				bias-pull-up;
			};
		};
	};

	fragment@1 {
		target-path = "/";
		__overlay__ {
			gpio-keys-user {
				compatible = "gpio-keys";
				pinctrl-names = "default";
				pinctrl-0 = <&gpio_button_0>;

				power_button {
					label = "GPIO Key Power";
					linux,code = <KEY_POWER>;
					gpios = <&pio 0 20 GPIO_ACTIVE_LOW>;
				};
			};
		};
	};
};

 

dtc -I dts -O dtb -o overlay-user/test.dtbo overlay-user/gpio-poweroff.dts

 

But the DTC outputs the following error:

 

Error: overlay-user/gpio-poweroff.dts:2.2-8 syntax error
FATAL ERROR: Unable to parse input tree

 

What is wrong with this overlay?

[Werner]

Moved to Common issues / peer to peer technical support

[tparys]

linux,code = <KEY_POWER>;
gpios = <&pio 0 20 GPIO_ACTIVE_LOW>;

 

These two lines. When compiling outside of the kernel source, constants like GPIO_ACTIVE_LOW don't get resolved because they don't have the kernel headers included in the compilation path.

 

If you have the linux kernel sources downloaded, a simple grep will tell you what they're supposed to be.

 

tparys@wander:linux/include/dt-bindings$ grep -r GPIO_ACTIVE_LOW .
./gpio/gpio.h:#define GPIO_ACTIVE_LOW 1

 

I'd also check that KEY_POWER is correct. That's not part of the 5.10 mainline, as far as I see.

 

In the future, just comment out parts of your dtc overlay until it compiles, and add parts back in until it breaks. Should narrow your problems down pretty quick.

[kampi]

Hi,

 

sorry, but this doesn´t solve the problem. I reduce the overlay to 

 

/dts-v1/;
/plugin/;

/ {
	compatible = "allwinner,sun4i-a10", "allwinner,sun7i-a20", "allwinner,sun8i-h3", "allwinner,sun50i-a64", "allwinner,sun50i-h5";

	fragment@0 {
		target = <&pio>;
		__overlay__ {
			gpio_button_0: gpio_button_0 {
				pins = "PA20";
				function = "gpio_in";
				bias-pull-up;
			};
		};
	};
};

 

and I still have the same problem.

[tparys]

The snippet you posted compiles fine for me.

[kampi]

mmh maybe some missing dependencies or an old version? Which device tree compiler do you use?

[tparys]

Works on both my laptop (amd64) and my NanoPi M4V2 (arm64). Both are 1.5.1-1.

 

Perhaps you're not trying to compile the file you think you are.

[kampi]

I´m pretty sure that I try to compile the correct file. But my DTC is only version 1.4.2. Maybe thats the issue.

[kampi]

I can compile the fragment on my Raspberry Pi with DT 1.4.7, so there is definitely an issue with the version. How can I update the DTC on my OrangePi? Using apt doesn´t work, because I have the current version already.

[tparys]

1.5.1-1 is current as of Ubuntu Focal. Perhaps a version difference in Debian, or an outdated install?

 

The output of "armbianmonitor -u" might help.

[kampi]

vor 2 Stunden schrieb tparys:

1.5.1-1 is current as of Ubuntu Focal. Perhaps a version difference in Debian, or an outdated install?

 

The output of "armbianmonitor -u" might help.

mmh the command doesn´t output an URL.

[kampi]

Anyway I have downloaded DTC 1.4.7 and this version fixes the issue.