RockPi-E enabling UART1 and OTG using custom DT overlays

[djjerdog]

I wanted to share 2 custom overlays I've created and tested for the RockPi E to enable UART1 and OTG via the GPIO.

 

Create file rockchip-uart1.dts

/dts-v1/;
/ {
	compatible = "rockchip,rk3328";
	fragment@0 {
		target-path = "/serial@ff120000";
		__overlay__ {
			pinctrl-0 = < 0x23 >;
			status = "okay";
		};
	};
};

 

Create file rockchip-otg.dts

/dts-v1/;
/ {
	compatible = "rockchip,rk3328";
	fragment@0 {
		target-path = "/usb@ff580000";
		__overlay__ {
			dr_mode = "otg";			
		};
	};
};

 

 

Install and enable overlays:
sudo armbian-add-overlay rockchip-uart1.dts
sudo armbian-add-overlay rockchip-otg.dts

[ChrisO]

Excellent! Thank you very much! A second serial port is what I was looking for and now it works.

Couldn't figure out how to use the OTG one, though. Which GPIO pins are involved?

 

Regards,

Chris

[Armandooooo]

Hi,

 

I have followed the procedure above to make it work, however I have an issue still. I am on armbian 21.08.1 Buster with Linux 5.10.60, the latest available. For information I have make this work with the legacy kernel so my wiring is fine.

 

#sudo dd bs=1M if=/dev/zero of=/piusb.bin count=64

#mkfs.ext4 -t ext4 /piusb.bin -O ^has_journal 

#sudo modprobe g_mass_storage file=/piusb.bin stall=0 removable=1 ro=1

#dmesg |tail -20

[   58.531943] Mass Storage Function, version: 2009/09/11
[   58.531983] LUN: removable file: (no medium)
[   58.532430] LUN: removable read only file: /piusb.bin
[   58.532452] Number of LUNs=1
[   58.532861] g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11
[   58.532882] g_mass_storage gadget: userspace failed to provide iSerialNumber
[   58.532896] g_mass_storage gadget: g_mass_storage ready
[   58.532921] dwc2 ff580000.usb: bound driver g_mass_storage
[   58.548704] dwc2 ff580000.usb: dwc2_core_reset: HANG! Soft Reset timeout GRSTCTL_CSFTRST
 

Do you know what can make this dwc2_core_reset: HANG?

 

Thank you,

Armandooooo