DESK-MX8M-L/Peripherals/USB2 OTG
< DESK-MX8M-L
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Contents
Peripheral USB Host[edit | edit source]
The USB2 Type-C port requires to configure the USB VBUS regulator and the gpio used for enabling the 5V USB power switch in Host mode.
Device tree configuration[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the ORCA SOM:
From imx8mp-mito8mplus-cb1001.dts:
reg_usb2_host_vbus: regulator-usb2-vbus {
compatible = "regulator-fixed";
regulator-name = "usb2_host_vbus";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usb2_vbus>;
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
gpio = <&gpio1 14 GPIO_ACTIVE_HIGH>;
enable-active-high;
regulator-always-on;
};
...
...
&usb3_phy1 {
fsl,phy-tx-preemp-amp-tune = <2>;
status = "okay";
};
&usb3_1 {
status = "okay";
};
&usb_dwc3_1 {
dr_mode = "host";
status = "okay";
};
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
When a USB peripheral is inserted, in the following example a memory mass storage device, the kernel recognizes the device (i.e. class, vendor id, product id, etc.)
root@desk-mx8mp:~# [ 1071.894621] usb 1-1: new high-speed USB device number 2 using xhci-hcd [ 1072.112493] usb-storage 1-1:1.0: USB Mass Storage device detected [ 1072.120066] scsi host0: usb-storage 1-1:1.0 [ 1073.137381] scsi 0:0:0:0: Direct-Access Kingston DataTraveler 2.0 0000 PQ: 0 ANSI: 4 [ 1073.147989] sd 0:0:0:0: [sda] 15151168 512-byte logical blocks: (7.76 GB/7.22 GiB) [ 1073.157372] sd 0:0:0:0: [sda] Write Protect is off [ 1073.163950] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 1073.202664] sda: sda1 [ 1073.211474] sd 0:0:0:0: [sda] Attached SCSI removable disk root@desk-mx8mp:~#
Additional information[edit | edit source]
If the root file system configuration does not automatically mount the partition, it is possible to mount the device using the following command:
root@desk-mx8mp:~# mkdir -p /mnt/usb root@desk-mx8mp:~# mount /dev/sda1 /mnt/usb [ 1245.415662] FAT-fs (sda1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck. root@desk-mx8mp:~# ls -la /mnt/usb total 128 drwxr-xr-x 10 root root 4096 Jan 1 1970 . drwxr-xr-x 3 root root 4096 Dec 30 11:24 .. drwxr-xr-x 2 root root 4096 May 13 2021 System Volume Information drwxr-xr-x 2 root root 4096 Nov 17 15:27 boot -rwxr-xr-x 1 root root 8016 Nov 17 15:27 boot.scr -rwxr-xr-x 1 root root 1712 Dec 10 16:16 config.txt drwxr-xr-x 2 root root 4096 Nov 17 15:27 rfs -rwxr-xr-x 1 root root 57458 Nov 17 15:27 run-system-update.sh -rwxr-xr-x 1 root root 531 Nov 17 15:27 settings.txt
