Upstreaming AIRBox Q900

meco · March 18, 2026, 10:51am

I’m currently in the process of upstreaming the Q900 and while porting the device tree there was this one comment:

arch/arm64/boot/dts/qcom/qcs9075-radxa-airbox-q900.dts

530af5112


      
          			 * FIXME: This should have regulator-allow-set-load but
          			 * we're getting an over-current fault from the PMIC
          			 * when switching to LPM.
          			 */

that would be needed to addressed.
@Stephen @strongtz @Nasca can any of you give more info about it?

meco · March 18, 2026, 11:30am

I also could not find which DP to HDMI IC was used. Can someone comment that one too?

strongtz · March 20, 2026, 10:33am

This should not be required as the vreg_l4c node of lemans-evk.dts in the upstream tree uses regulator-allow-set-load.

Stephen · March 20, 2026, 10:36am

Hi Q900 uses the bridge ic, RA620, which is supported. linux/drivers/gpu/drm/bridge/simple-bridge.c at master · torvalds/linux · GitHub