Each MU has four pairs of rx/tx data register with four rx/tx interrupts
which can also be used as a separate channel.
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/mailbox/fsl,mu.txt | 26 ++++++++++++++++---
1 file changed, 23 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/mailbox/fsl,mu.txt b/Documentation/devicetree/bindings/mailbox/fsl,mu.txt
index 90e4905dfc69..f3cf77eb5ab4 100644
--- a/Documentation/devicetree/bindings/mailbox/fsl,mu.txt
+++ b/Documentation/devicetree/bindings/mailbox/fsl,mu.txt
@@ -18,11 +18,31 @@ Messaging Unit Device Node:
Required properties:
-------------------
- compatible : should be "fsl,<chip>-mu", the supported chips include
- imx8qxp, imx8qm.
+ imx6sx, imx7s, imx8qxp, imx8qm.
+ The "fsl,imx6sx-mu" compatible is seen as generic and should
+ be included together with SoC specific compatible.
- reg : Should contain the registers location and length
- interrupts : Interrupt number. The interrupt specifier format depends
on the interrupt controller parent.
-- #mbox-cells: Must be 0. Number of cells in a mailbox
+- #mbox-cells: Must be 2.
+ <&phandle type channel>
+ phandle : Label name of controller
+ type : Channel type
+ channel : Channel number
+
+ This MU support 4 type of unidirectional channels, each type
+ has 4 channels. A total of 16 channels. Following types are
+ supported:
+ 0 - TX channel with 32bit transmit register and IRQ transmit
+ acknowledgment support.
+ 1 - RX channel with 32bit receive register and IRQ support
+ 2 - TX doorbell channel. Without own register and no ACK support.
+ 3 - RX doorbell channel.
+
+Optional properties:
+-------------------
+- clocks : phandle to the input clock.
+- fsl,mu-side-b : Should be set for side B MU.
Examples:
--------
@@ -30,5 +50,5 @@ lsio_mu0: mailbox@5d1b0000 {
compatible = "fsl,imx8qxp-mu";
reg = <0x0 0x5d1b0000 0x0 0x10000>;
interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
- #mbox-cells = <0>;
+ #mbox-cells = <2>;
};
--
2.18.0
--
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