[PATCH v6 1/4] dt-bindings: dmaengine: Add MediaTek Command-Queue DMA controller bindings

EastL Lee
2020-07-02T07:06:23Z

Document the devicetree bindings for MediaTek Command-Queue DMA controller
which could be found on MT6779 SoC or other similar Mediatek SoCs.

Signed-off-by: EastL Lee <EastL.Lee@mediatek.com>
---
.../devicetree/bindings/dma/mtk-cqdma.yaml | 113 +++++++++++++++++++++
1 file changed, 113 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/mtk-cqdma.yaml

diff --git a/Documentation/devicetree/bindings/dma/mtk-cqdma.yaml b/Documentation/devicetree/bindings/dma/mtk-cqdma.yaml
new file mode 100644
index 0000000..83ed742
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/mtk-cqdma.yaml
@@ -0,0 +1,113 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/mtk-cqdma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek Command-Queue DMA controller Device Tree Binding
+
+maintainers:
+ - EastL Lee <EastL.Lee@mediatek.com>
+
+description:
+ MediaTek Command-Queue DMA controller (CQDMA) on Mediatek SoC
+ is dedicated to memory-to-memory transfer through queue based
+ descriptor management.
+
+allOf:
+ - $ref: "dma-controller.yaml#"
+
+properties:
+ "#dma-cells":
+ minimum: 1
+ maximum: 255
+ description:
+ Used to provide DMA controller specific information.
+
+ compatible:
+ oneOf:
+ - const: mediatek,mt6765-cqdma
+ - const: mediatek,mt6779-cqdma
+
+ reg:
+ minItems: 1
+ maxItems: 5
+ description:
+ A base address of MediaTek Command-Queue DMA controller,
+ a channel will have a set of base address.
+
+ interrupts:
+ minItems: 1
+ maxItems: 5
+ description:
+ A interrupt number of MediaTek Command-Queue DMA controller,
+ one interrupt number per dma-channels.
+
+ clocks:
+ maxItems: 1
+
+ clock-names:
+ const: cqdma
+
+ dma-channel-mask:
+ $ref: /schemas/types.yaml#definitions/uint32
+ description:
+ For DMA capability, We will know the addressing capability of
+ MediaTek Command-Queue DMA controller through dma-channel-mask.
+ items:
+ minItems: 1
+ maxItems: 63
+
+ dma-channels:
+ $ref: /schemas/types.yaml#definitions/uint32
+ description:
+ Number of DMA channels supported by MediaTek Command-Queue DMA
+ controller, support up to five.
+ items:
+ minItems: 1
+ maxItems: 5
+
+ dma-requests:
+ $ref: /schemas/types.yaml#definitions/uint32
+ description:
+ Number of DMA request (virtual channel) supported by MediaTek
+ Command-Queue DMA controller, support up to 32.
+ items:
+ minItems: 1
+ maxItems: 32
+
+required:
+ - "#dma-cells"
+ - compatible
+ - reg
+ - interrupts
+ - clocks
+ - clock-names
+ - dma-channel-mask
+ - dma-channels
+ - dma-requests
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+ #include <dt-bindings/clock/mt6779-clk.h>
+ cqdma: dma-controller@10212000 {
+ compatible = "mediatek,mt6779-cqdma";
+ reg = <0x10212000 0x80>,
+ <0x10212080 0x80>,
+ <0x10212100 0x80>;
+ interrupts = <GIC_SPI 139 IRQ_TYPE_LEVEL_LOW>,
+ <GIC_SPI 140 IRQ_TYPE_LEVEL_LOW>,
+ <GIC_SPI 141 IRQ_TYPE_LEVEL_LOW>;
+ clocks = <&infracfg_ao CLK_INFRA_CQ_DMA>;
+ clock-names = "cqdma";
+ dma-channel-mask = <63>;
+ dma-channels = <3>;
+ dma-requests = <32>;
+ #dma-cells = <1>;
+ };
+
+...
--
1.9.1