Device tree error for board pca_20035 (Thingy:91)

[Jesper Tiberg]

Current (as of today) version of NCS wont build device tree out of the box.

Output using cmake+ninja (but same if using emStudio):

-- Using application from '/home/jesper/progging/nrf9160/ncs/nrf/samples/nrf9160/mqtt_simple'
Zephyr version: 1.14.99
-- Found PythonInterp: /usr/bin/python3 (found suitable version "3.6.8", minimum required is "3.4") 
-- Selected BOARD nrf9160_pca20035
-- Found west: /home/jesper/.local/bin/west (found suitable version "0.6.0", minimum required is "0.6.0")
-- Cache files will be written to: /home/jesper/.cache/zephyr
USING OUT OF TREE BOARD
-- Loading /home/jesper/progging/nrf9160/ncs/nrf/boards/arm/nrf9160_pca20035/nrf9160_pca20035.dts as base
-- Overlaying /home/jesper/progging/nrf9160/ncs/zephyr/dts/common/common.dts
device tree error: 'tx-pin' is marked as required in 'properties:' in /home/jesper/progging/nrf9160/ncs/zephyr/dts/bindings/serial/nordic,nrf-uarte.yaml, but does not appear in <Node /soc/peripheral@50000000/uart@a000 in 'nrf9160_pca20035.dts.pre.tmp'>
CMake Error at /home/jesper/progging/nrf9160/ncs/zephyr/cmake/dts.cmake:181 (message):
new extractor failed with return code: 1
Call Stack (most recent call first):
/home/jesper/progging/nrf9160/ncs/zephyr/cmake/app/boilerplate.cmake:532 (include)
CMakeLists.txt:10 (include)

-- Configuring incomplete, errors occurred!

To (ugly-)fix the issue, I added the required properties for uart2 in nrf/boards/arm/nrf9160_pca20035/nrf9160_pca20035_common.dts.

&uart2 {
current-speed = <1000000>;
status = "okay";
tx-pin = <100>;
rx-pin = <101>;
rts-pin = <102>;
cts-pin = <103>;
};

It's obviously wrong - I just set them to something - but it builds now :-)

What is the correct solution for this?

[Bjørn Kvaale]

I do not believe that example will work out of the box with the Thingy:91 unfortunately. This is most likely because the Thingy:91 has not been released yet. Have you tried checking out this pull request using these commands:

cd to ncs/nrf
git fetch origin pull/943/head:joakim
git checkout joakim
west update

[Jesper Tiberg]

I tried the PR even before posting this issue - same result.

My device tree workaround solves the build error and I haven't seen any side effects, so I'll just use it until there is an official update.

Primarily I wanted to let you know of the issue, and perhaps it helps someone else.

Is the Thingy:91 dev team working in a private (publicly invisible) branch?

[Bjørn Kvaale]

Jesper Tiberg said:

Is the Thingy:91 dev team working in a private (publicly invisible) branch?

 I do not believe it is a private branch, no. My guess is it will be fixed on the release data of the Thingy:91. If you have anymore issues related to this, just update this case please.