diff options
| author | Sudeep Holla <sudeep.holla@arm.com> | 2017-06-26 16:02:39 +0100 |
|---|---|---|
| committer | Ryan Harkin <ryan.harkin@linaro.org> | 2017-07-27 09:53:34 +0100 |
| commit | 4684537d36985fb4c2c009e9a6fde76f2cb311f3 (patch) | |
| tree | 8c681cb3f996c296d3fa0710d3767ac7be397d86 | |
| parent | a64a8bd60b683e040d07e924c8394976ee68f82c (diff) | |
dt-bindings: mailbox: add support for mailbox client shared memory
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.
Change-Id: I798369f83f91ad1be7e50469d0722c84caecc97a
Acked-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
| -rw-r--r-- | Documentation/devicetree/bindings/mailbox/mailbox.txt | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mailbox/mailbox.txt b/Documentation/devicetree/bindings/mailbox/mailbox.txt index be05b9746c69..af8ecee2ac68 100644 --- a/Documentation/devicetree/bindings/mailbox/mailbox.txt +++ b/Documentation/devicetree/bindings/mailbox/mailbox.txt @@ -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>; + .. + }; |