linux-kernel - [PATCH 1/3] dt-bindings: dmaengine: Document qcom,gpi dma binding

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Message-Id: <20200824084712.2526079-2-vkoul@kernel.org>
Date:   Mon, 24 Aug 2020 14:17:10 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     dmaengine@...r.kernel.org, Rob Herring <robh+dt@...nel.org>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] dt-bindings: dmaengine: Document qcom,gpi dma binding

Add devicetree binding documentation for GPI DMA controller
implemented on Qualcomm SoCs

Signed-off-by: Vinod Koul <vkoul@...nel.org>
---
 .../devicetree/bindings/dma/qcom-gpi.yaml     | 87 +++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/qcom-gpi.yaml

diff --git a/Documentation/devicetree/bindings/dma/qcom-gpi.yaml b/Documentation/devicetree/bindings/dma/qcom-gpi.yaml
new file mode 100644
index 000000000000..c56d601ad2d6
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/qcom-gpi.yaml
@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/gpi-dma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies Inc GPI DMA controller
+
+description: |
+  QCOM GPI DMA controller provides DMA capabilities for
+  peripheral buses such as I2C, UART, and SPI.
+
+maintainers:
+  - Vinod Koul <vkoul@...nel.org>
+
+allOf:
+  - $ref: "dma-controller.yaml#"
+
+properties:
+  compatible:
+    enum:
+      - qcom,gpi-dma
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    description:
+      Interrupt lines for each GPII instance
+    maxItems: 14
+
+  qcom,max-num-gpii:
+    description:
+      Maximum number of GPII instances available
+    maxItems: 1
+
+  "#dma-cells":
+    const: 1
+
+  qcom,gpii-mask:
+    description:
+      Bitmap of supported GPII instances for OS
+    maxItems: 1
+
+  qcom,ev-factor:
+    description:
+      Event ring transfer size compare to channel transfer ring. Event
+        ring length = ev-factor * transfer ring size
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - qcom,max-num-gpii
+  - qcom,gpii-mask
+  - qcom,ev-factor
+  - "#dma-cells"
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    gpi_dma0: dma@...000 {
+        #dma-cells = <5>;
+        compatible = "qcom,gpi-dma";
+        reg = <0 0x00800000 0 0x60000>;
+        qcom,max-num-gpii = <13>;
+        qcom,gpii-mask = <0xfa>;
+        qcom,ev-factor = <2>;
+        interrupts = <GIC_SPI 244 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 246 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 247 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 248 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 249 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 250 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 251 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 252 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 253 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 254 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 255 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 256 IRQ_TYPE_LEVEL_HIGH>;
+    };
+
+...
-- 
2.26.2