From a649244de727b87d38fe46d86ef98c8d1fc49551 Mon Sep 17 00:00:00 2001 From: Neil Armstrong Date: Thu, 18 Aug 2016 12:10:26 +0200 Subject: [PATCH] dt-bindings: mailbox: Add Amlogic Meson MHU Bindings Signed-off-by: Neil Armstrong Acked-by: Rob Herring Signed-off-by: Jassi Brar --- .../devicetree/bindings/mailbox/meson-mhu.txt | 34 ++++++++++++++++++++++ 1 file changed, 34 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..a530310 --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/meson-mhu.txt @@ -0,0 +1,34 @@ +Amlogic Meson MHU Mailbox Driver +================================ + +The Amlogic's Meson SoCs 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. + +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@c883c404 { + #mbox-cells = <1>; + compatible = "amlogic,meson-gxbb-mhu"; + reg = <0 0xc883c404 0 0x4c>; + interrupts = <0 208 IRQ_TYPE_EDGE_RISING>, + <0 209 IRQ_TYPE_EDGE_RISING>, + <0 210 IRQ_TYPE_EDGE_RISING>; + #mbox-cells = <1>; + }; -- 2.7.4