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dt-bindings: mailbox: add support for mailbox client shared memory

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Many users of the mailbox controllers depend on the shared memory
between the two end points to exchange the main data while using simple
doorbell mechanism to alert the end points of the presence of a message.

This patch defines device tree bindings to represent such shared memory
in a generic way.

Cc: Mark Rutland <mark.rutland@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Sudeep Holla 2017-06-26 16:02:39 +01:00
parent 7928b2cbe5
commit 07455e4e43
1 changed files with 28 additions and 0 deletions
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28
Documentation/devicetree/bindings/mailbox/mailbox.txt
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@ -23,6 +23,11 @@ Required property:
Optional property:
- mbox-names: List of identifier strings for each mailbox channel.
- shmem : List of phandle pointing to the shared memory(SHM) area between the
users of these mailboxes for IPC, one for each mailbox. This shared
memory can be part of any memory reserved for the purpose of this
communication between the mailbox client and the remote.
Example:
pwr_cntrl: power {
@ -30,3 +35,26 @@ Example:
mbox-names = "pwr-ctrl", "rpc";
mboxes = <&mailbox 0 &mailbox 1>;
};
Example with shared memory(shmem):
sram: sram@50000000 {
compatible = "mmio-sram";
reg = <0x50000000 0x10000>;
#address-cells = <1>;
#size-cells = <1>;
ranges = <0 0x50000000 0x10000>;
cl_shmem: shmem@0 {
compatible = "client-shmem";
reg = <0x0 0x200>;
};
};
client@2e000000 {
...
mboxes = <&mailbox 0>;
shmem = <&cl_shmem>;
..
};