linux-kernel - [PATCH v5 3/5] dt-bindings: reserved-memory: Add support for DRAM MRQ GSCs

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Message-ID: <20230529135044.2746339-4-pdeschrijver@nvidia.com>
Date:   Mon, 29 May 2023 16:50:47 +0300
From:   Peter De Schrijver <pdeschrijver@...dia.com>
To:     Peter De Schrijver <pdeschrijver@...dia.com>, <stefank@...dia.com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>
CC:     Jassi Brar <jassisinghbrar@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Joe Perches <joe@...ches.com>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        Conor Dooley <conor.dooley@...rochip.com>
Subject: [PATCH v5 3/5] dt-bindings: reserved-memory: Add support for DRAM MRQ GSCs

Add bindings for DRAM MRQ GSC support.

Co-developed-by: Stefan Kristiansson <stefank@...dia.com>
Signed-off-by: Stefan Kristiansson <stefank@...dia.com>
Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
---
 .../nvidia,tegra264-bpmp-shmem.yaml           | 47 +++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reserved-memory/nvidia,tegra264-bpmp-shmem.yaml

diff --git a/Documentation/devicetree/bindings/reserved-memory/nvidia,tegra264-bpmp-shmem.yaml b/Documentation/devicetree/bindings/reserved-memory/nvidia,tegra264-bpmp-shmem.yaml
new file mode 100644
index 000000000000..f9b2f0fdc282
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/nvidia,tegra264-bpmp-shmem.yaml
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/nvidia,tegra264-bpmp-shmem.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Tegra CPU-NS - BPMP IPC reserved memory
+
+maintainers:
+  - Peter De Schrijver <pdeschrijver@...dia.com>
+
+description: |
+  Define a memory region used for communication between CPU-NS and BPMP.
+  Typically this node is created by the bootloader as the physical address
+  has to be known to both CPU-NS and BPMP for correct IPC operation.
+  The memory region is defined using a child node under /reserved-memory.
+  The sub-node is named shmem@<address>.
+
+allOf:
+  - $ref: reserved-memory.yaml
+
+properties:
+  compatible:
+    const: nvidia,tegra264-bpmp-shmem
+
+  reg:
+    description: The physical address and size of the shared SDRAM region
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - no-map
+
+examples:
+  - |
+    reserved-memory {
+       #address-cells = <2>;
+       #size-cells = <2>;
+       dram_cpu_bpmp_mail: shmem@...e0000 {
+           compatible = "nvidia,tegra264-bpmp-shmem";
+           reg = <0x0 0xf1be0000 0x0 0x2000>;
+           no-map;
+       };
+    };
+...
-- 
2.34.1