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39e47767ec
This patch adds "driver_override" device attribute for rpmsg_device which will allow users to explicitly specify the rpmsg_driver to be used via sysfs entry. The "driver_override" device attribute implemented here is very similar to "driver_override" implemented for platform, pci, and amba bus types. One important use-case of "driver_override" device attribute is to force use of rpmsg_chrdev driver for certain rpmsg_device instances. Signed-off-by: Anup Patel <anup@brainfault.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
96 lines
3.7 KiB
Plaintext
96 lines
3.7 KiB
Plaintext
What: /sys/bus/rpmsg/devices/.../name
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Date: June 2011
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KernelVersion: 3.3
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Contact: Ohad Ben-Cohen <ohad@wizery.com>
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Description:
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Every rpmsg device is a communication channel with a remote
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processor. Channels are identified with a (textual) name,
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which is maximum 32 bytes long (defined as RPMSG_NAME_SIZE in
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rpmsg.h).
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This sysfs entry contains the name of this channel.
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What: /sys/bus/rpmsg/devices/.../src
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Date: June 2011
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KernelVersion: 3.3
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Contact: Ohad Ben-Cohen <ohad@wizery.com>
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Description:
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Every rpmsg device is a communication channel with a remote
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processor. Channels have a local ("source") rpmsg address,
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and remote ("destination") rpmsg address. When an entity
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starts listening on one end of a channel, it assigns it with
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a unique rpmsg address (a 32 bits integer). This way when
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inbound messages arrive to this address, the rpmsg core
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dispatches them to the listening entity (a kernel driver).
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This sysfs entry contains the src (local) rpmsg address
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of this channel. If it contains 0xffffffff, then an address
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wasn't assigned (can happen if no driver exists for this
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channel).
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What: /sys/bus/rpmsg/devices/.../dst
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Date: June 2011
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KernelVersion: 3.3
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Contact: Ohad Ben-Cohen <ohad@wizery.com>
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Description:
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Every rpmsg device is a communication channel with a remote
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processor. Channels have a local ("source") rpmsg address,
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and remote ("destination") rpmsg address. When an entity
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starts listening on one end of a channel, it assigns it with
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a unique rpmsg address (a 32 bits integer). This way when
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inbound messages arrive to this address, the rpmsg core
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dispatches them to the listening entity.
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This sysfs entry contains the dst (remote) rpmsg address
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of this channel. If it contains 0xffffffff, then an address
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wasn't assigned (can happen if the kernel driver that
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is attached to this channel is exposing a service to the
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remote processor. This make it a local rpmsg server,
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and it is listening for inbound messages that may be sent
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from any remote rpmsg client; it is not bound to a single
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remote entity).
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What: /sys/bus/rpmsg/devices/.../announce
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Date: June 2011
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KernelVersion: 3.3
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Contact: Ohad Ben-Cohen <ohad@wizery.com>
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Description:
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Every rpmsg device is a communication channel with a remote
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processor. Channels are identified by a textual name (see
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/sys/bus/rpmsg/devices/.../name above) and have a local
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("source") rpmsg address, and remote ("destination") rpmsg
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address.
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A channel is first created when an entity, whether local
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or remote, starts listening on it for messages (and is thus
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called an rpmsg server).
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When that happens, a "name service" announcement is sent
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to the other processor, in order to let it know about the
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creation of the channel (this way remote clients know they
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can start sending messages).
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This sysfs entry tells us whether the channel is a local
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server channel that is announced (values are either
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true or false).
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What: /sys/bus/rpmsg/devices/.../driver_override
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Date: April 2018
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KernelVersion: 4.18
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Contact: Bjorn Andersson <bjorn.andersson@linaro.org>
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Description:
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Every rpmsg device is a communication channel with a remote
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processor. Channels are identified by a textual name (see
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/sys/bus/rpmsg/devices/.../name above) and have a local
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("source") rpmsg address, and remote ("destination") rpmsg
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address.
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The listening entity (or client) which communicates with a
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remote processor is referred as rpmsg driver. The rpmsg device
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and rpmsg driver are matched based on rpmsg device name and
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rpmsg driver ID table.
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This sysfs entry allows the rpmsg driver for a rpmsg device
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to be specified which will override standard OF, ID table
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and name matching.
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