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From:   Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To:     bjorn.andersson@linaro.org, broonie@kernel.org
Cc:     plai@codeaurora.org, tiwai@suse.de, robh@kernel.org,
        devicetree@vger.kernel.org, perex@perex.cz,
        alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
        lgirdwood@gmail.com, bgoswami@codeaurora.org,
        Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Subject: [RFC PATCH 01/13] soc: dt-bindings: qcom: add gpr bindings
Date:   Mon,  7 Jun 2021 16:28:24 +0100
Message-Id: <20210607152836.17154-2-srinivas.kandagatla@linaro.org>
In-Reply-To: <20210607152836.17154-1-srinivas.kandagatla@linaro.org>
References: <20210607152836.17154-1-srinivas.kandagatla@linaro.org>
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Qualcomm Generic Packet router aka GPR is the IPC mechanism found
in AudioReach next generation signal processing framework to perform
command and response messages between various processors.

GPR has concepts of static and dynamic port, all static services like
APM (Audio Processing Manager), PRM (Proxy resource manager) have
fixed port numbers where as dynamic services like graphs have dynamic
port numbers which are allocated at runtime. All GPR packet messages
will have source and destination domain and port along with opcode
and payload.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 .../bindings/soc/qcom/qcom,gpr.yaml           | 74 +++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,gpr.yaml

diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,gpr.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,gpr.yaml
new file mode 100644
index 000000000000..cc08ec51de6a
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,gpr.yaml
@@ -0,0 +1,74 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/soc/qcom/qcom,gpr.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Qualcomm Generic Packet Router binding
+
+maintainers:
+  - Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+
+description: |
+  This binding describes the Qualcomm Generic Packet Router,Shared Memory Manager,
+  used to send and receive packets between Audio DSP and Application processor.
+
+properties:
+  compatible:
+    const: qcom,gpr
+
+  qcom,glink-channels:
+    const: adsp_apps
+    description:
+      glink channel associated with gpr function
+
+  qcom,gpr-domain:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1, 2, 3]
+    description:
+      Selects the processor domain for gpr
+        1 = Modem Domain
+        2 = Audio DSP Domain
+        3 = Application Processor Domain
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+#GPR Services
+patternProperties:
+  'gprservice@[0-9]+$':
+    type: object
+    description:
+      GPR node's client devices use subnodes for desired static port services.
+
+    properties:
+      reg:
+        maxItems: 1
+        description: Service port id
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - qcom,glink-channels
+  - qcom,gpr-domain
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/soc/qcom,gpr.h>
+    gpr {
+        compatible = "qcom,gpr";
+        qcom,glink-channels = "adsp_apps";
+        qcom,gpr-domain = <GPR_DOMAIN_ID_ADSP>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        gprservice@1 {
+          reg = <GPR_APM_MODULE_IID>;
+        };
+    };
-- 
2.21.0