Difference between revisions of "1-1-1-1-3-1-21"
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− | + | <!-- Set release according to "release" parameter in URL and use RELEASE_SUMO_V1.0_DART-MX8M as default | |
− | + | --> {{#vardefine:RELEASE_PARAM|{{#urlget:release}}}} <!-- | |
− | + | --> {{#lst:Yocto_Platform_Customization|{{#var:RELEASE_PARAM|RELEASE_SUMO_V1.0_DART-MX8M}}}} <!-- | |
− | + | --> {{#lst:Android_Platform_Customization|{{#var:RELEASE_PARAM|RELEASE_N7.1.1_1.0.0_VAR-SOM-MX6}}}} <!-- | |
− | + | --> {{PageHeader|{{#var:HARDWARE_NAME}} USB OTG}} {{DocImage|category1=Yocto|category2=Android}}[[Category:DART-MX8M]][[Category:DART-MX8M-MINI]] __toc__ | |
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− | + | = Configuring the USB OTG port under Linux = | |
− | + | By default, the USB OTG port is configured as OTG in the device tree, and a USB type-C receptacle is assembled on the DART-MX8M custom board.<br> | |
To use it as host only or peripheral only you need to change the value of the dr_mode property under the USB node in the device tree.<br> | To use it as host only or peripheral only you need to change the value of the dr_mode property under the USB node in the device tree.<br> | ||
dr_mode: One of "host", "peripheral" or "otg". Defaults to "otg"<br> | dr_mode: One of "host", "peripheral" or "otg". Defaults to "otg"<br> | ||
Line 30: | Line 12: | ||
For example:<br> | For example:<br> | ||
Follow either the "Build the Linux kernel from source code" or "Customizing the Linux kernel" Wiki pages and edit the following device tree file:<br> | Follow either the "Build the Linux kernel from source code" or "Customizing the Linux kernel" Wiki pages and edit the following device tree file:<br> | ||
− | arch/arm64/boot/dts/freescale/fsl-imx8mm-var-dart.dts <br> | + | arch/arm64/boot/dts/{{#ifeq: {{#var:HARDWARE_NAME}}|DART-MX8M|{{#ifeq: {{#var:YOCTO_NAME}}|Morty|variscite/imx8m-var-dart-common.dtsi|freescale/fsl-imx8mq-var-dart-common.dtsi}}|freescale/fsl-imx8mm-var-dart.dts}} <br> |
− | + | ||
− | < | + | {{#ifeq: {{#var:HARDWARE_NAME}} | DART-MX8M | |
− | < | + | <syntaxhighlight lang="diff"> |
− | + | &usb_dwc3_0 { | |
− | + | status = "okay"; | |
− | + | extcon = <&typec_ptn5150>; | |
− | + | - dr_mode = "otg"; | |
− | + | + dr_mode = "host"; | |
− | + | }; | |
+ | </syntaxhighlight> | ||
+ | | | ||
+ | <syntaxhighlight lang="diff"> | ||
+ | &usbotg1 { | ||
+ | - dr_mode = "otg"; | ||
+ | + dr_mode = "host"; | ||
+ | picophy,pre-emp-curr-control = <3>; | ||
+ | picophy,dc-vol-level-adjust = <7>; | ||
+ | status = "okay"; | ||
+ | }; | ||
+ | </syntaxhighlight> | ||
+ | }} | ||
+ | |||
+ | If you build the kernel manually from source code, you should build ''only'' the device trees and copy them to your SD card or eMMC.<br> | ||
<br> | <br> | ||
Note: You can read the current dr_mode value on a running target, by executing the following command: | Note: You can read the current dr_mode value on a running target, by executing the following command: | ||
− | </ | + | {{#ifeq: {{#var:HARDWARE_NAME}} | DART-MX8M | |
+ | <pre> | ||
+ | # cat /sys/firmware/devicetree/base/usb@38100000/dwc3/dr_mode; echo | ||
+ | </pre> | ||
+ | | | ||
<pre> | <pre> | ||
# cat /sys/firmware/devicetree/base/usb@32e40000/dr_mode; echo | # cat /sys/firmware/devicetree/base/usb@32e40000/dr_mode; echo | ||
</pre> | </pre> | ||
− | + | }} | |
− | + | ||
− | + | = Using the USB OTG port under Linux = | |
− | + | == As host (default) == | |
− | + | [[IMX_USB_Host|USB host]] | |
− | + | ||
+ | == As peripheral == | ||
+ | {{#ifeq: {{#var:ANDROID_NAME}} | Pie | | ||
+ | By default Android configures USB peripheral as ADB, if connected Type - C plug to Standard-A plug cable between board and PC it configures | ||
+ | {{#var:HARDWARE_NAME}} as gadget. <br> | ||
+ | Connect a type-C plug to Standard-A plug cable between the board and a PC <br> | ||
+ | $ adb devices | ||
+ | You should see below output | ||
+ | |||
+ | $ adb devices | ||
+ | List of devices attached | ||
+ | 0a2299d4e6fe1111 device | ||
+ | | | ||
+ | In order to use the board as a peripheral, an appropriate module needs to be loaded.<br> | ||
For example, there is an Ethernet gadget module called g_ether, a mass storage gadget called g_mass_storage, a serial gadget called g_serial, etc.<br> | For example, there is an Ethernet gadget module called g_ether, a mass storage gadget called g_mass_storage, a serial gadget called g_serial, etc.<br> | ||
<br> | <br> | ||
Example using the g_mass_storage module to expose the root partition on eMMC to a PC while booting from recovery SD card:<br> | Example using the g_mass_storage module to expose the root partition on eMMC to a PC while booting from recovery SD card:<br> | ||
Connect a type-C plug to Standard-A plug cable between the board and a PC, and run the following on the board: | Connect a type-C plug to Standard-A plug cable between the board and a PC, and run the following on the board: | ||
− | + | # umount /dev/{{#var:EMMC_ROOTFS_DEV}}p1 | |
− | + | # modprobe g_mass_storage file=/dev/{{#var:EMMC_ROOTFS_DEV}}p1 | |
− | # modprobe g_mass_storage file=/dev/ | ||
</pre> | </pre> | ||
− | + | The partition should be loaded on the PC as a mass storage device. | |
− | + | }} | |
− | + | ||
− | + | == As OTG == | |
− | + | With OTG, the board can be either a host, or a peripheral.<br> | |
In order to use it as a host and connect a peripheral (e.g. a USB flash drive) to it, either use a peripheral with type-C connector or use type-C to type-A adapter.<br> | In order to use it as a host and connect a peripheral (e.g. a USB flash drive) to it, either use a peripheral with type-C connector or use type-C to type-A adapter.<br> | ||
In order to use it as a peripheral and connect it to a PC, for example, a cable with a type-C plug on one end and a Standard-A plug on the other is needed.<br> | In order to use it as a peripheral and connect it to a PC, for example, a cable with a type-C plug on one end and a Standard-A plug on the other is needed.<br> | ||
<br> | <br> | ||
− |
Latest revision as of 16:24, 10 March 2020
Android Platform Customization
DART-MX8M USB OTG
Contents
Configuring the USB OTG port under Linux
By default, the USB OTG port is configured as OTG in the device tree, and a USB type-C receptacle is assembled on the DART-MX8M custom board.
To use it as host only or peripheral only you need to change the value of the dr_mode property under the USB node in the device tree.
dr_mode: One of "host", "peripheral" or "otg". Defaults to "otg"
For example:
Follow either the "Build the Linux kernel from source code" or "Customizing the Linux kernel" Wiki pages and edit the following device tree file:
arch/arm64/boot/dts/freescale/fsl-imx8mq-var-dart-common.dtsi
<syntaxhighlight lang="diff">
&usb_dwc3_0 { status = "okay"; extcon = <&typec_ptn5150>;
- dr_mode = "otg"; + dr_mode = "host"; }; </syntaxhighlight>
If you build the kernel manually from source code, you should build only the device trees and copy them to your SD card or eMMC.
Note: You can read the current dr_mode value on a running target, by executing the following command:
# cat /sys/firmware/devicetree/base/usb@38100000/dwc3/dr_mode; echo
Using the USB OTG port under Linux
As host (default)
As peripheral
In order to use the board as a peripheral, an appropriate module needs to be loaded.
For example, there is an Ethernet gadget module called g_ether, a mass storage gadget called g_mass_storage, a serial gadget called g_serial, etc.
Example using the g_mass_storage module to expose the root partition on eMMC to a PC while booting from recovery SD card:
Connect a type-C plug to Standard-A plug cable between the board and a PC, and run the following on the board:
# umount /dev/mmcblk0p1 # modprobe g_mass_storage file=/dev/mmcblk0p1
The partition should be loaded on the PC as a mass storage device.
As OTG
With OTG, the board can be either a host, or a peripheral.
In order to use it as a host and connect a peripheral (e.g. a USB flash drive) to it, either use a peripheral with type-C connector or use type-C to type-A adapter.
In order to use it as a peripheral and connect it to a PC, for example, a cable with a type-C plug on one end and a Standard-A plug on the other is needed.