MCXN947 HPDAC (14-bit) driver support in Zephyr

[wesOS]

I am using Zephyr on an MCXN947 and I need to use the on-chip 14-bit HPDAC (clocked as DAC2, i.e., kCLOCK_Dac2 in the MCUXpresso HAL). I cannot find a Zephyr devicetree binding and driver that targets the HPDAC peripheral on this SoC. Is the MCXN947 HPDAC currently supported upstream in Zephyr, and if not, what are the recommended options? If there is an existing patch/branch or tracking issue for HPDAC support, could you point me to it.

[Harry_Zhang]

Hi @wesOS 

The MCXN947 HPDAC (DAC2) is not currently supported in upstream Zephyr. The FRDM‑MCXN947 board only includes support for the LPDAC (nxp,lpdac), and there is no devicetree binding or driver for HPDAC in Zephyr.

        dac0: dac@10f000 {
		compatible = "nxp,lpdac";
		reg = <0x10f000 0x1000>;
		interrupts = <106 0>;
		status = "disabled";
		voltage-reference = <0>;
		#io-channel-cells = <1>;
	};

FRDM-MCXN947 — Zephyr Project Documentation

If you need HPDAC functionality now, the recommended approach is to use the MCUXpresso SDK HPDAC driver directly inside your Zephyr application, when a peripheral has no Zephyr driver.

BR

Harry

[wesOS]

Hi @Harry_Zhang,

Thank you for your reply. Is it clear when zephyr support for DAC2 will be added? Or is there an estimate?

BR,

Wes

[Harry_Zhang]

Hi @wesOS 

I need to confirm it with our internal team.

I will inform you as soon as there is a result.

BR

Harry

[Harry_Zhang · Accepted solution]

Hi @wesOS 

We have a draft Pull Request available that adds the HPDAC and DAC2 on the MCXN947.

You can check.

drivers: dac: enable nxp hpdac by ZhaoxiangJin · Pull Request #104642 · zephyrproject-rtos/zephyr · ...

BR

Harry

[wesOS]

Thank you very much!