linux-kernel - [PATCH v2 02/34] dt-bindings: mailbox: Add Intel VPU IPC mailbox bindings

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Date:   Fri,  8 Jan 2021 13:25:28 -0800
From:   mgross@...ux.intel.com
To:     markgross@...nel.org, mgross@...ux.intel.com, arnd@...db.de,
        bp@...e.de, damien.lemoal@....com, dragan.cvetic@...inx.com,
        gregkh@...uxfoundation.org, corbet@....net,
        leonard.crestez@....com, palmerdabbelt@...gle.com,
        paul.walmsley@...ive.com, peng.fan@....com, robh+dt@...nel.org,
        shawnguo@...nel.org, jassisinghbrar@...il.com
Cc:     linux-kernel@...r.kernel.org,
        Daniele Alessandrelli <daniele.alessandrelli@...el.com>
Subject: [PATCH v2 02/34] dt-bindings: mailbox: Add Intel VPU IPC mailbox bindings

From: Daniele Alessandrelli <daniele.alessandrelli@...el.com>

Add bindings for the Intel VPU IPC mailbox driver.

Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@...el.com>
---
 .../mailbox/intel,vpu-ipc-mailbox.yaml        | 69 +++++++++++++++++++
 MAINTAINERS                                   |  6 ++
 2 files changed, 75 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/intel,vpu-ipc-mailbox.yaml

diff --git a/Documentation/devicetree/bindings/mailbox/intel,vpu-ipc-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/intel,vpu-ipc-mailbox.yaml
new file mode 100644
index 000000000000..923a6d619a64
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/intel,vpu-ipc-mailbox.yaml
@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (c) 2020 Intel Corporation
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/mailbox/intel,vpu-ipc-mailbox.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Intel VPU IPC mailbox
+
+maintainers:
+  - Daniele Alessandrelli <daniele.alessandrelli@...el.com>
+
+description: |
+  Intel VPU SoCs like Keem Bay have hardware FIFOs to enable Inter-Processor
+  Communication (IPC) between the CPU and the VPU.
+
+  Specifically, there is one HW FIFO for the CPU (aka Application Processor -
+  AP) and one for the VPU. Each FIFO can hold 128 entries of 32 bits each. A
+  "FIFO-not-empty" interrupt is raised every time there is at least a message
+  in the FIFO. The CPU FIFO raises interrupts to the CPU, while the VPU FIFO
+  raises interrupts to VPU. When the CPU wants to send a message to the VPU it
+  writes to the VPU FIFO, similarly, when the VPU want to send a message to the
+  CPU, it writes to the CPU FIFO.
+
+  Refer to ./mailbox.txt for generic information about mailbox device-tree
+  bindings.
+
+properties:
+  compatible:
+    const: intel,vpu-ipc-mailbox
+
+  reg:
+    items:
+      - description: The CPU FIFO registers
+      - description: The VPU FIFO registers
+
+  reg-names:
+    items:
+      - const: cpu_fifo
+      - const: vpu_fifo
+
+  interrupts:
+    items:
+      - description: CPU FIFO-not-empty interrupt
+
+  "#mbox-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - "#mbox-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    vpu_ipc_mailbox@...300f0 {
+        compatible = "intel,vpu-ipc-mailbox";
+        #mbox-cells = <1>;
+        reg = <0x203300f0 0x310>,
+              <0x208200f0 0x310>;
+        reg-names = "cpu_fifo", "vpu_fifo";
+        interrupts = <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 6eff4f720c72..c0fb04969916 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9183,6 +9183,12 @@ L:	platform-driver-x86@...r.kernel.org
 S:	Maintained
 F:	drivers/platform/x86/intel-vbtn.c
 
+INTEL VPU IPC MAILBOX
+M:	Daniele Alessandrelli <daniele.alessandrelli@...el.com>
+M:	Mark Gross <mgross@...ux.intel.com>
+S:	Supported
+F:	Documentation/devicetree/bindings/mailbox/intel,vpu-ipc-mailbox.yaml
+
 INTEL WIRELESS 3945ABG/BG, 4965AGN (iwlegacy)
 M:	Stanislaw Gruszka <stf_xl@...pl>
 L:	linux-wireless@...r.kernel.org
-- 
2.17.1