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Date: Tue, 17 Oct 2017 11:33:04 -0700
From: Wendy Liang <wendy.liang@...inx.com>
To: <devicetree@...r.kernel.org>
CC: <robh+dt@...nel.org>, <mark.rutland@....com>,
<michal.simek@...inx.com>, <soren.brinkmann@...inx.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <cyrilc@...inx.com>,
<willw@...inx.com>, Wendy Liang <jliang@...inx.com>
Subject: [RFC PATCH v2] Dcoumentation: dt: 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 <jliang@...inx.com>
---
V2: Each ZynqMP IPI mailbox controller instance for one physical connection
between two ZynqMP IPI agents.
---
.../bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt | 103 +++++++++++++++++++++
1 file changed, 103 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt
diff --git a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt
new file mode 100644
index 0000000..ba02b93
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt
@@ -0,0 +1,103 @@
+Xilinx IPI Mailbox Driver
+========================================
+
+The Xilinx IPI(Inter Processor Interrupt) mailbox driver is a mailbox
+controller that manages the 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:
+--------------------
+- compatible: Shall be: "xlnx,zynqmp-ipi-mailbox"
+- reg: IPI buffers address range
+- reg-names: Names of the reg resources
+- #mbox-cells: Shall be 1. It contains:
+ * tx(0) or rx(1) channel
+- ipi-ids: IPI agent IDs of the two ends of the
+ communication.
+- interrupt-parent: Phandle for the interrupt controller
+- interrupts: Interrupt information corresponding to the
+ interrupt-names property.
+
+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:
+===========================
+ /* APU IPI mailbox driver */
+ ipi_mailbox_rpu0: ipi_mailbox@...f90400 {
+ compatible = "xlnx,zynqmp-ipi-mailbox";
+ reg = <0x0 0xff990400 0x0 0x20>,
+ <0x0 0xff990420 0x0 0x20>,
+ <0x0 0xff990080 0x0 0x20>,
+ <0x0 0xff9900a0 0x0 0x20>;
+ reg-names = "local_request_region", "local_response_region",
+ "remote_request_region", "remote_response_region";
+ #mbox-cells = <1>;
+ ipi-ids = <0 1>;
+ interrupt-parent = <&gic>;
+ interrupts = <0 29 4>;
+ };
+ ipi_mailbox_rpu1: ipi_mailbox@...90440 {
+ compatible = "xlnx,zynqmp-ipi-mailbox";
+ reg = <0x0 0xff990440 0x0 0x20>,
+ <0x0 0xff990460 0x0 0x20>,
+ <0x0 0xff990280 0x0 0x20>,
+ <0x0 0xff9902a0 0x0 0x20>;
+ reg-names = "local_request_region", "local_response_region",
+ "remote_request_region", "remote_response_region";
+ #mbox-cells = <1>;
+ ipi-ids = <0 2>;
+ interrupt-parent = <&gic>;
+ interrupts = <0 29 4>;
+ };
+ rpu_subsystem0: rpu_subsystem@0 {
+ rpu0 {
+ ...
+ mbox-clients = <&ipi_mailbox_rpu0 0>,
+ <&ipi_mailbox_rpu0 1>;
+ mbox-clients-names = "tx", "rx";
+ };
+ rpu1 {
+ ...
+ mbox-clients = <&ipi_mailbox_rpu1 0>,
+ <&ipi_mailbox_rpu1 1>;
+ mbox-clients-names = "tx", "rx";
+ };
+ };
--
2.7.4
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