nrf52811_caaa.dtsi?

Question

Hello! 
 I'm developing firmware for a custom board based on nRF52811 CAAA. I am trying to create a new board under .\v1.9.1\zephyr\boards\arm
rf52840dk_nrf52811_myboard\. I have created a dts file with this include: 
 #include <nordic/nrf52811_caaa.dtsi> 
 but I get an error. I see there's no nrf52811_caaa.dtsi under .\v1.9.1\zephyr\dts\arm
ordic. Is it necessary to create it? Can I use nrf52811_qfaa.dtsi or nrf52811.dtsi instead? However I see there's no &flash0 nor $sram0 in nrf52811.dtsi. 
 
 Thank you, 
 David.

Einarh · Accepted Answer

Hello! 
 I believe you should be able to use nrf52811.dtsi. 
 If you have a look at the nrf52811_qfaa.dtsi file, you'll see that it includes the nrf52811.dtsi file and only alters the flash and ram according to the qfaa specification. 
 Both sram and flash are defined in nrf52811.dtsi, the "&" in the qfaa file is only there because it refers to existing nodes in the nrf52811.dtsi file. 
 Please refer to the Zephyr devicetree documentation for more information. 
 About your follow up question, pins will be defined as integers in the Zephyr devicetree, and you'll have to find the mapping from port/pin to gpio addressing number in the documentation for your chip. 
 If you are using default pins for I2C, it might be enough to use nrf52811.dtsi and include "CONFIG_I2C=y" in your prj.conf in order to use I2C, otherwise I would recommend you refer to the devicetree documentation for how to set up your dts file. 
 Best regards, 
 Einar