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authorJassi Brar <jaswinder.singh@linaro.org>2014-06-26 17:39:42 +0400
committerJassi Brar <jaswinder.singh@linaro.org>2015-03-17 08:42:01 +0300
commitee23d66af9219dfe2407a9b08ef9a165dbe6f994 (patch)
tree5091f3e2b8eb928c982ec1af7593804372956fbe /Documentation/devicetree/bindings/mailbox
parent33350e6b1833b15cf9c9c4c84d8534ad68b0c7b8 (diff)
downloadlinux-ee23d66af9219dfe2407a9b08ef9a165dbe6f994.tar.xz
mailbox: arm_mhu: add driver for ARM MHU controller
Add driver for the ARM Primecell Message-Handling-Unit(MHU) controller. Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Signed-off-by: Andy Green <andy.green@linaro.org> Signed-off-by: Vincent Yang <vincent.yang@socionext.com> Signed-off-by: Tetsuya Nuriya <nuriya.tetsuya@socionext.com>
Diffstat (limited to 'Documentation/devicetree/bindings/mailbox')
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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 */
+ };