[PATCH 2/3] dt-bindings: mailbox: Add Amlogic Meson MHU Bindings

Neil Armstrong
2016-08-09T08:52:16Z

.../devicetree/bindings/mailbox/meson-mhu.txt | 33 ++++++++++++++++++++++
1 file changed, 33 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mailbox/meson-mhu.txt

diff --git a/Documentation/devicetree/bindings/mailbox/meson-mhu.txt b/Documentation/devicetree/bindings/mailbox/meson-mhu.txt
new file mode 100644
index 0000000..4a80b44
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/meson-mhu.txt
@@ -0,0 +1,33 @@
+Amlogic Meson MHU Mailbox Driver
+================================
+
+The Amlogic's Meson SoCs Message-Handling-Unit (MHU) is a mailbox controller
+that has 2 independent channels/links to communicate with remote processor(s).
+MHU links are hardwired on a platform. A link raises interrupt for any
+received data. However, there is no specified way of knowing if the sent
+data has been read by the remote. This driver assumes the sender polls
+STAT register and the remote clears it after having read the data.
+
+Mailbox Device Node:
+====================
+
+Required properties:
+--------------------
+- compatible: Shall be "amlogic,meson-gxbb-mhu"
+- reg: Contains the mailbox register address range (base
+ address and length)
+- #mbox-cells Shall be 1 - the index of the channel needed.
+- interrupts: Contains the interrupt information corresponding to
+ each of the 2 links of MHU.
+
+Example:
+--------
+
+ mailbox: mailbox at c883c400 {
+ #mbox-cells = <1>;
+ compatible = "amlogic,meson-gxbb-mhu";
+ reg = <0 0xc883c400 0 0x4c>;
+ interrupts = <0 209 IRQ_TYPE_EDGE_RISING>,
+ <0 210 IRQ_TYPE_EDGE_RISING>;
+ #mbox-cells = <1>;
+ };
--
2.7.0