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-rw-r--r--dts/Bindings/mailbox/mailbox.txt28
1 files changed, 28 insertions, 0 deletions
diff --git a/dts/Bindings/mailbox/mailbox.txt b/dts/Bindings/mailbox/mailbox.txt
index be05b97..af8ecee 100644
--- a/dts/Bindings/mailbox/mailbox.txt
+++ b/dts/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>;
+ ..
+ };