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authorSudeep Holla <sudeep.holla@arm.com>2017-06-26 18:02:39 +0300
committerSudeep Holla <sudeep.holla@arm.com>2018-02-28 19:37:57 +0300
commit07455e4e4321129af0053c61191707ccf8289fc7 (patch)
treef90ded543bb3b89ec1418e56b2201ee3d29190fe /Documentation/devicetree/bindings/mailbox
parent7928b2cbe55b2a410a0f5c1f154610059c57b1b2 (diff)
downloadlinux-07455e4e4321129af0053c61191707ccf8289fc7.tar.xz
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. Cc: Mark Rutland <mark.rutland@arm.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'Documentation/devicetree/bindings/mailbox')
-rw-r--r--Documentation/devicetree/bindings/mailbox/mailbox.txt28
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>;
+ ..
+ };