forked from Minki/linux
a649244de7
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
35 lines
1.1 KiB
Plaintext
35 lines
1.1 KiB
Plaintext
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>;
|
|
};
|