https://devzone.nordicsemi.com/f/nordic-q-a/107450/devicetree-for-many-peripherals-uart-i2c-spiI have a custom board based on the nRF5340. I have 3 UART, 2 SPI, and 4 I2C busses (9 total). I&#39;ve tried to put these in my devicetree like so: This throws an error that &quot;i2c4&quot; is an &quot;unknown label&quot;, because it&#39;s not defined in `nrf5340_cpuapp_peripheralsen-USTelligent Community 13Fri, 19 Jan 2024 15:17:10 GMThttps://devzone.nordicsemi.com/thread/465098?ContentTypeID=1Fri, 19 Jan 2024 15:17:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:08346170-1350-43b0-b131-8788e3ead149Naeem Maroof<p>Number of peripherals and IDs are as defined in the product specification, so you can not add more.</p> <p>But as for the serial bus (I2C and SPI) is concerned, what you can do is put multiple devices on single bus and address them as per your use case.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/464615?ContentTypeID=1Wed, 17 Jan 2024 13:41:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ade8ee7a-3a51-4adf-ae11-d181e4a196e1Kyle<p>Yes, but is it possible to define additional IDs (e.g. in a device tree overlay), or is the nRF5340 strictly limited to 4?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/464609?ContentTypeID=1Wed, 17 Jan 2024 13:31:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3febb41e-a222-46a9-9119-1f1f82919021Naeem Maroof<p>Unfortunately, at a time, you can only use one of the instances that share the same ID:</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1705498298297v1.png" alt=" " /></p><div style="clear:both;"></div>