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author | Neil Armstrong <narmstrong@baylibre.com> | 2016-08-18 10:10:26 (GMT) |
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committer | Jassi Brar <jaswinder.singh@linaro.org> | 2016-09-07 07:37:18 (GMT) |
commit | a649244de727b87d38fe46d86ef98c8d1fc49551 (patch) | |
tree | 0b823c7ad5c67558f44904fc39334f72a198485a /Documentation/devicetree/bindings/mailbox | |
parent | ad3a212c1db1650b1f6e438201494c7bb7111f54 (diff) | |
download | linux-a649244de727b87d38fe46d86ef98c8d1fc49551.tar.xz |
dt-bindings: mailbox: Add Amlogic Meson MHU Bindings
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/mailbox')
-rw-r--r-- | Documentation/devicetree/bindings/mailbox/meson-mhu.txt | 34 |
1 files changed, 34 insertions, 0 deletions
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>; + }; |