DESK-MX9-L/Peripherals/USB2 OTG
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| 2024/01/30 | DESK-MX9-L-5.x.x release | ||
Contents
Peripheral USB2 OTG[edit | edit source]
AURA SOM supports OTG/Host/Peripheral modes: on AURA Evaluation Kit the USB2 OTG port is configured as USB Host.
Device tree configuration[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the AURA SOM:
From kernel device tree imx93-aura.dtsi:
...
&usbotg2 {
dr_mode = "otg";
hnp-disable;
srp-disable;
adp-disable;
disable-over-current;
samsung,picophy-pre-emp-curr-control = <3>;
samsung,picophy-dc-vol-level-adjust = <7>;
status = "disabled";
};
...
From kernel device tree imx93-aura-cb2001.dts:
/ {
...
regulators {
...
reg_usb_pwr: usb_pwr {
compatible = "regulator-fixed";
regulator-name = "usb_pwr_en";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
gpio = <&gpio1 8 GPIO_ACTIVE_HIGH>;
enable-active-high;
};
...
};
...
};
...
&usbotg2 {
dr_mode = "host";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usb_pwr>;
vbus-supply = <®_usb_pwr>;
status = "okay";
};
...
&iomuxc {
...
pinctrl_usb_pwr: usbpwrgrp {
fsl,pins = <
MX93_PAD_PDM_CLK__GPIO1_IO08 0x31e
>;
};
...
};
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. xlass, vendor id, product id, etc.)
[ 1272.354409] usb 1-1: new high-speed USB device number 3 using ci_hdrc [ 1272.521077] usb-storage 1-1:1.0: USB Mass Storage device detected [ 1272.527735] scsi host0: usb-storage 1-1:1.0 [ 1273.539755] scsi 0:0:0:0: Direct-Access USB SanDisk 3.2Gen1 1.00 PQ: 0 ANSI: 6 [ 1273.550783] sd 0:0:0:0: [sda] 60125184 512-byte logical blocks: (30.8 GB/28.7 GiB) [ 1273.560595] sd 0:0:0:0: [sda] Write Protect is off [ 1273.567632] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 1273.592520] sda: sda1 [ 1273.601008] sd 0:0:0:0: [sda] Attached SCSI removable disk
Additional information[edit | edit source]
The root file system configuration automatically mounts the partition:
root@desk-mx93:~# lsblk /dev/sda NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS sda 8:0 1 28.7G 0 disk `-sda1 8:1 1 28.7G 0 part /run/media/<usb-partition-name>-sda1
The mount point directory name depends on the USB partition name.
