linux-kernel - [PATCH 1/2] dt-bindings: dmaengine: Add MediaTek Command-Queue DMA controller bindings

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Message-ID: <1539848951-14798-2-git-send-email-shun-chih.yu@mediatek.com>
Date:   Thu, 18 Oct 2018 15:49:10 +0800
From:   <shun-chih.yu@...iatek.com>
To:     Sean Wang <sean.wang@...iatek.com>, Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Dan Williams <dan.j.williams@...el.com>
CC:     <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <srv_wsdupstream@...iatek.com>,
        Shun-Chih Yu <shun-chih.yu@...iatek.com>
Subject: [PATCH 1/2] dt-bindings: dmaengine: Add MediaTek Command-Queue DMA controller bindings

From: Shun-Chih Yu <shun-chih.yu@...iatek.com>

Document the devicetree bindings for MediaTek Command-Queue DMA controller
which could be found on MT6765 SoC or other similar Mediatek SoCs.

Signed-off-by: Shun-Chih Yu <shun-chih.yu@...iatek.com>
Reviewed-by: Rob Herring <robh at kernel.org>

---
 .../devicetree/bindings/dma/mtk-cqdma.txt          |   31 ++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/mtk-cqdma.txt

diff --git a/Documentation/devicetree/bindings/dma/mtk-cqdma.txt b/Documentation/devicetree/bindings/dma/mtk-cqdma.txt
new file mode 100644
index 0000000..fb12927
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/mtk-cqdma.txt
@@ -0,0 +1,31 @@
+MediaTek Command-Queue DMA Controller
+==================================
+
+Required properties:
+
+- compatible:	Must be "mediatek,mt6765-cqdma" for MT6765.
+- reg:		Should contain the base address and length for each channel.
+- interrupts:	Should contain references to the interrupts for each channel.
+- clocks:	Should be the clock specifiers corresponding to the entry in
+		clock-names property.
+- clock-names:	Should contain "cqdma" entries.
+- dma-channels: The number of DMA channels supported by the controller.
+- dma-requests: The number of DMA request supported by the controller.
+- #dma-cells: 	The length of the DMA specifier, must be <1>. This one cell
+		in dmas property of a client device represents the channel
+		number.
+Example:
+
+        cqdma: dma-controller@...12000 {
+		compatible = "mediatek,mt6765-cqdma";
+		reg = <0 0x10212000 0 0x1000>;
+		interrupts = <GIC_SPI 113 IRQ_TYPE_LEVEL_LOW>,
+			<GIC_SPI 114 IRQ_TYPE_LEVEL_LOW>;
+		clocks = <&infracfg CLK_IFR_CQ_DMA>;
+		clock-names = "cqdma";
+		dma-channels = <2>;
+		dma-requests = <32>;
+		#dma-cells = <1>;
+	};
+
+DMA clients must use the format described in dma/dma.txt file.
-- 
1.7.9.5