linux-kernel - [PATCH v6 1/3] dt-bindings: dmaengine: Add MediaTek High-Speed DMA controller bindings

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Message-ID: <1ae80ef14cac41dea35dca49e8071d67c955f5e7.1520407882.git.sean.wang@mediatek.com>
Date:   Wed, 7 Mar 2018 16:16:26 +0800
From:   <sean.wang@...iatek.com>
To:     <vinod.koul@...el.com>, <dan.j.williams@...el.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>
CC:     <dmaengine@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Sean Wang <sean.wang@...iatek.com>
Subject: [PATCH v6 1/3] dt-bindings: dmaengine: Add MediaTek High-Speed DMA controller bindings

From: Sean Wang <sean.wang@...iatek.com>

Document the devicetree bindings for MediaTek High-Speed DMA controller
which could be found on MT7623 SoC or other similar Mediatek SoCs.

Signed-off-by: Sean Wang <sean.wang@...iatek.com>
---
 .../devicetree/bindings/dma/mtk-hsdma.txt          | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/mtk-hsdma.txt

diff --git a/Documentation/devicetree/bindings/dma/mtk-hsdma.txt b/Documentation/devicetree/bindings/dma/mtk-hsdma.txt
new file mode 100644
index 0000000..4bb31735
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/mtk-hsdma.txt
@@ -0,0 +1,33 @@
+MediaTek High-Speed DMA Controller
+==================================
+
+This device follows the generic DMA bindings defined in dma/dma.txt.
+
+Required properties:
+
+- compatible:	Must be one of
+		  "mediatek,mt7622-hsdma": for MT7622 SoC
+		  "mediatek,mt7623-hsdma": for MT7623 SoC
+- reg:		Should contain the register's base address and length.
+- interrupts:	Should contain a reference to the interrupt used by this
+		device.
+- clocks:	Should be the clock specifiers corresponding to the entry in
+		clock-names property.
+- clock-names:	Should contain "hsdma" entries.
+- power-domains: Phandle to the power domain that the device is part of
+- #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:
+
+        hsdma: dma-controller@...07000 {
+		compatible = "mediatek,mt7623-hsdma";
+		reg = <0 0x1b007000 0 0x1000>;
+		interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_LOW>;
+		clocks = <&ethsys CLK_ETHSYS_HSDMA>;
+		clock-names = "hsdma";
+		power-domains = <&scpsys MT2701_POWER_DOMAIN_ETH>;
+		#dma-cells = <1>;
+	};
+
+DMA clients must use the format described in dma/dma.txt file.
-- 
2.7.4