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This patch adds support for usb role swap via sysfs "role". For example: 1) Connect a usb cable using 2 Salvator-X boards. - For A-Device, the cable is connected to CN11 (USB3.0 ch0). - For B-Device, the cable is connected to CN9 (USB2.0 ch0). 2) On A-Device, you input the following command: # echo peripheral > /sys/devices/platform/soc/ee020000.usb/role 3) On B-Device, you input the following command: # echo host > /sys/devices/platform/soc/ee080200.usb-phy/role Then, the A-Device acts as a peripheral and the B-Device acts as a host. Please note that A-Device must input the following command if you want the board to act as a host again. # echo host > /sys/devices/platform/soc/ee020000.usb/role Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
16 lines
547 B
Plaintext
16 lines
547 B
Plaintext
What: /sys/devices/platform/<renesas_usb3's name>/role
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Date: March 2017
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KernelVersion: 4.13
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Contact: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
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Description:
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This file can be read and write.
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The file can show/change the drd mode of usb.
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Write the following string to change the mode:
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"host" - switching mode from peripheral to host.
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"peripheral" - switching mode from host to peripheral.
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Read the file, then it shows the following strings:
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"host" - The mode is host now.
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"peripheral" - The mode is peripheral now.
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