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| 2024/01/30 | DESK-MX9-L-5.0.0 release | ||
Contents
Peripheral USB2 OTGEdit
AURA SOM supports OTG/Host/Peripheral modes: on AURA Evaluation Kit the USB2 OTG port is configured as USB Host.
Device tree configurationEdit
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 peripheralEdit
Linux messages at boot timeEdit
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 informationEdit
The root file system configuration does automatically mount 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/<name-usb-partition>-sda1
The directory name mounted depend from usb name partition.