On Thu, 2020-07-09 at 14:59 -0600, Rob Herring wrote:

On Thu, Jul 02, 2020 at 03:06:01PM +0800, EastL Lee wrote:

quoted

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 <redacted>
---
 .../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
+---
+$id: https://urldefense.com/v3/__http://devicetree.org/schemas/dma/mtk-cqdma.yaml*__;Iw!!CTRNKA9wMg0ARbw!1P_if3RiZOVpzN8n4EQI0IxZq0d07UksSgeHYA0h6HLylU9l4pu2eggq7eeVsF2H$ 
+$schema: https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!1P_if3RiZOVpzN8n4EQI0IxZq0d07UksSgeHYA0h6HLylU9l4pu2eggq7ZMPow23$ 
+
+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.

No, for a specific binding like this, it should be 1 defined value.

OK.I'll fix it to const 1

quoted

+
+  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

Alreay has a type, don't redefine it here.

OK

quoted

+    description:
+       For DMA capability, We will know the addressing capability of
+       MediaTek Command-Queue DMA controller through dma-channel-mask.

This sounds like the kernel's DMA masks which is not what this property 
is.

Yes, this is for kernel's DMA mask.
Do I need to declare this member again?

quoted

+    items:
+      minItems: 1
+      maxItems: 63

An array of 63 elements?

I think you want:

minimum: 1
maximum: 63

Or:

enum: [ 1, 3, 7, 0xf, 0x1f, 0x3f ]

(Though if this works, then just 'dma-channels' is enough.)

quoted

+
+  dma-channels:
+    $ref: /schemas/types.yaml#definitions/uint32
+    description:
+      Number of DMA channels supported by MediaTek Command-Queue DMA
+      controller, support up to five.

Is it 5 or 6 channels? You're off by one somewhere.

Currently chip CQDMA only has three channels at most, I'll fix it to
maxnum 3

quoted

+    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

You are describing how many elements in an array and this is a scalar.

OK I;ll fix to minnum & maxnum

quoted

+
+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

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