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2aefbef041
This patch adds a sysfs interface to rproc allowing the firmware name and processor state to be changed dynamically. State was previously available in debugfs, and is replicated here. The firmware file allows retrieval of the running firmware name, and a new one to be specified at run time, so long as the remote processor has been stopped. Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
50 lines
1.4 KiB
Text
50 lines
1.4 KiB
Text
What: /sys/class/remoteproc/.../firmware
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Date: October 2016
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Contact: Matt Redfearn <matt.redfearn@imgtec.com>
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Description: Remote processor firmware
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Reports the name of the firmware currently loaded to the
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remote processor.
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To change the running firmware, ensure the remote processor is
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stopped (using /sys/class/remoteproc/.../state) and write a new filename.
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What: /sys/class/remoteproc/.../state
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Date: October 2016
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Contact: Matt Redfearn <matt.redfearn@imgtec.com>
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Description: Remote processor state
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Reports the state of the remote processor, which will be one of:
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"offline"
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"suspended"
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"running"
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"crashed"
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"invalid"
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"offline" means the remote processor is powered off.
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"suspended" means that the remote processor is suspended and
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must be woken to receive messages.
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"running" is the normal state of an available remote processor
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"crashed" indicates that a problem/crash has been detected on
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the remote processor.
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"invalid" is returned if the remote processor is in an
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unknown state.
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Writing this file controls the state of the remote processor.
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The following states can be written:
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"start"
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"stop"
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Writing "start" will attempt to start the processor running the
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firmware indicated by, or written to,
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/sys/class/remoteproc/.../firmware. The remote processor should
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transition to "running" state.
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Writing "stop" will attempt to halt the remote processor and
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return it to the "offline" state.
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