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dt-bindings: mailbox: Add Xilinx IPI Mailbox 

Xilinx ZynqMP IPI(Inter Processor Interrupt) is a hardware block
in ZynqMP SoC used for the communication between various processor
systems.

Signed-off-by: Wendy Liang <wendy.liang@xilinx.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Wendy Liang 2019-02-21 16:36:34 -08:00 committed by Jassi Brar
parent 4981b82ba2
commit abdd85b6ba
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Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt Normal file
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Xilinx IPI Mailbox Controller
========================================
The Xilinx IPI(Inter Processor Interrupt) mailbox controller is to manage
messaging between two Xilinx Zynq UltraScale+ MPSoC IPI agents. Each IPI
agent owns registers used for notification and buffers for message.
+-------------------------------------+
| Xilinx ZynqMP IPI Controller |
+-------------------------------------+
+--------------------------------------------------+
ATF | |
| |
| |
+--------------------------+ |
| |
| |
+--------------------------------------------------+
+------------------------------------------+
| +----------------+ +----------------+ |
Hardware | | IPI Agent | | IPI Buffers | |
| | Registers | | | |
| | | | | |
| +----------------+ +----------------+ |
| |
| Xilinx IPI Agent Block |
+------------------------------------------+
Controller Device Node:
===========================
Required properties:
--------------------
IPI agent node:
- compatible: Shall be: "xlnx,zynqmp-ipi-mailbox"
- interrupt-parent: Phandle for the interrupt controller
- interrupts: Interrupt information corresponding to the
interrupt-names property.
- xlnx,ipi-id: local Xilinx IPI agent ID
- #address-cells: number of address cells of internal IPI mailbox nodes
- #size-cells: number of size cells of internal IPI mailbox nodes
Internal IPI mailbox node:
- reg: IPI buffers address ranges
- reg-names: Names of the reg resources. It should have:
* local_request_region
- IPI request msg buffer written by local and read
by remote
* local_response_region
- IPI response msg buffer written by local and read
by remote
* remote_request_region
- IPI request msg buffer written by remote and read
by local
* remote_response_region
- IPI response msg buffer written by remote and read
by local
- #mbox-cells: Shall be 1. It contains:
* tx(0) or rx(1) channel
- xlnx,ipi-id: remote Xilinx IPI agent ID of which the mailbox is
connected to.
Optional properties:
--------------------
- method: The method of accessing the IPI agent registers.
Permitted values are: "smc" and "hvc". Default is
"smc".
Client Device Node:
===========================
Required properties:
--------------------
- mboxes: Standard property to specify a mailbox
(See ./mailbox.txt)
- mbox-names: List of identifier strings for each mailbox
channel.
Example:
===========================
zynqmp_ipi {
compatible = "xlnx,zynqmp-ipi-mailbox";
interrupt-parent = <&gic>;
interrupts = <0 29 4>;
xlnx,ipi-id = <0>;
#address-cells = <1>;
#size-cells = <1>;
ranges;
/* APU<->RPU0 IPI mailbox controller */
ipi_mailbox_rpu0: mailbox@ff90400 {
reg = <0xff990400 0x20>,
<0xff990420 0x20>,
<0xff990080 0x20>,
<0xff9900a0 0x20>;
reg-names = "local_request_region",
"local_response_region",
"remote_request_region",
"remote_response_region";
#mbox-cells = <1>;
xlnx,ipi-id = <1>;
};
/* APU<->RPU1 IPI mailbox controller */
ipi_mailbox_rpu1: mailbox@ff990440 {
reg = <0xff990440 0x20>,
<0xff990460 0x20>,
<0xff990280 0x20>,
<0xff9902a0 0x20>;
reg-names = "local_request_region",
"local_response_region",
"remote_request_region",
"remote_response_region";
#mbox-cells = <1>;
xlnx,ipi-id = <2>;
};
};
rpu0 {
...
mboxes = <&ipi_mailbox_rpu0 0>,
<&ipi_mailbox_rpu0 1>;
mbox-names = "tx", "rx";
};
rpu1 {
...
mboxes = <&ipi_mailbox_rpu1 0>,
<&ipi_mailbox_rpu1 1>;
mbox-names = "tx", "rx";
};