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authorSascha Hauer <s.hauer@pengutronix.de>2015-05-06 08:56:43 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2015-05-06 08:56:43 +0200
commit461f8cfc7ea788428240271818363333ceff5c4c (patch)
treea3d6e3737c203ea29f8db2a6ddaadc326247376c /dts/Bindings/mailbox
parent6345d37ae50c3ac8dd0e6176bc846fe211cbddd4 (diff)
downloadbarebox-461f8cfc7ea788428240271818363333ceff5c4c.tar.gz
barebox-461f8cfc7ea788428240271818363333ceff5c4c.tar.xz
dts: update to v4.1-rc1
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'dts/Bindings/mailbox')
-rw-r--r--dts/Bindings/mailbox/arm-mhu.txt43
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diff --git a/dts/Bindings/mailbox/arm-mhu.txt b/dts/Bindings/mailbox/arm-mhu.txt
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+ARM MHU Mailbox Driver
+======================
+
+The ARM's Message-Handling-Unit (MHU) is a mailbox controller that has
+3 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.
+The last channel is specified to be a 'Secure' resource, hence can't be
+used by Linux running NS.
+
+Mailbox Device Node:
+====================
+
+Required properties:
+--------------------
+- compatible: Shall be "arm,mhu" & "arm,primecell"
+- 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 3 links of MHU.
+
+Example:
+--------
+
+ mhu: mailbox@2b1f0000 {
+ #mbox-cells = <1>;
+ compatible = "arm,mhu", "arm,primecell";
+ reg = <0 0x2b1f0000 0x1000>;
+ interrupts = <0 36 4>, /* LP-NonSecure */
+ <0 35 4>, /* HP-NonSecure */
+ <0 37 4>; /* Secure */
+ clocks = <&clock 0 2 1>;
+ clock-names = "apb_pclk";
+ };
+
+ mhu_client: scb@2e000000 {
+ compatible = "fujitsu,mb86s70-scb-1.0";
+ reg = <0 0x2e000000 0x4000>;
+ mboxes = <&mhu 1>; /* HP-NonSecure */
+ };