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Documentation: ABI: usb: sysfs Description for chipidea USB OTG HNP and SRP
This patch adds sysfs interface description for chipidea USB OTG HNP and SRP.
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Li Jun <b47624@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
authored by
Li Jun
and committed by
Greg Kroah-Hartman
f99858e0
88bdffc8
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Documentation/ABI/testing/sysfs-platform-chipidea-usb-otg
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Documentation/ABI/testing/sysfs-platform-chipidea-usb-otg
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What: /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req
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Date: Feb 2014
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Contact: Li Jun <b47624@freescale.com>
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Description:
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Can be set and read.
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Set a_bus_req(A-device bus request) input to be 1 if
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the application running on the A-device wants to use the bus,
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and to be 0 when the application no longer wants to use
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the bus(or wants to work as peripheral). a_bus_req can also
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be set to 1 by kernel in response to remote wakeup signaling
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from the B-device, the A-device should decide to resume the bus.
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Valid values are "1" and "0".
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Reading: returns 1 if the application running on the A-device
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is using the bus as host role, otherwise 0.
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What: /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop
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Date: Feb 2014
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Contact: Li Jun <b47624@freescale.com>
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Description:
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Can be set and read
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The a_bus_drop(A-device bus drop) input is 1 when the
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application running on the A-device wants to power down
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the bus, and is 0 otherwise, When a_bus_drop is 1, then
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the a_bus_req shall be 0.
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Valid values are "1" and "0".
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Reading: returns 1 if the bus is off(vbus is turned off) by
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A-device, otherwise 0.
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What: /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req
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Date: Feb 2014
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Contact: Li Jun <b47624@freescale.com>
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Description:
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Can be set and read.
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The b_bus_req(B-device bus request) input is 1 during the time
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that the application running on the B-device wants to use the
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bus as host, and is 0 when the application no longer wants to
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work as host and decides to switch back to be peripheral.
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Valid values are "1" and "0".
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Reading: returns if the application running on the B device
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is using the bus as host role, otherwise 0.
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What: /sys/bus/platform/devices/ci_hdrc.0/inputs/a_clr_err
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Date: Feb 2014
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Contact: Li Jun <b47624@freescale.com>
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Description:
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Only can be set.
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The a_clr_err(A-device Vbus error clear) input is used to clear
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vbus error, then A-device will power down the bus.
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Valid value is "1"