linux-kernel - [PATCH 06/10] arm64: allwinner: a64: Add devicetree binding for DMA controller

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Message-ID: <20170903224100.17893-7-stefan.bruens@rwth-aachen.de>
Date:   Mon, 4 Sep 2017 00:40:57 +0200
From:   Stefan Brüns <stefan.bruens@...h-aachen.de>
To:     <linux-sunxi@...glegroups.com>
CC:     <devicetree@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        Vinod Koul <vinod.koul@...el.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Code Kipper <codekipper@...il.com>,
        Andre Przywara <andre.przywara@....com>
Subject: [PATCH 06/10] arm64: allwinner: a64: Add devicetree binding for DMA controller

The A64 is register compatible with the H3, but has a different number
of dma channels and request ports.

Attach additional properties to the node to allow future reuse of the
compatible for controllers with different number of channels/requests.

If dma-requests is not specified, the register layout defined maximum
of 32 is used.

Signed-off-by: Stefan Brüns <stefan.bruens@...h-aachen.de>
---
 .../devicetree/bindings/dma/sun6i-dma.txt          | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
index 6b267045f522..66195fb31296 100644
--- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt
+++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
@@ -26,6 +26,32 @@ Example:
 		#dma-cells = <1>;
 	};
 
+------------------------------------------------------------------------------
+For A64 DMA controller:
+
+Required properties:
+- compatible:	"allwinner,sun50i-a64-dma"
+- dma-channels: Number of DMA channels supported by the controller.
+		Refer to Documentation/devicetree/bindings/dma/dma.txt
+- all properties above, i.e. reg, interrupts, clocks, resets and #dma-cells
+
+Optional properties:
+- dma-requests: Number of DMA request signals supported by the controller.
+		Refer to Documentation/devicetree/bindings/dma/dma.txt
+
+Example:
+	dma: dma-controller@...02000 {
+		compatible = "allwinner,sun50i-a64-dma";
+		reg = <0x01c02000 0x1000>;
+		interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&ccu CLK_BUS_DMA>;
+		dma-channels = <8>;
+		dma-requests = <27>;
+		resets = <&ccu RST_BUS_DMA>;
+		#dma-cells = <1>;
+	};
+------------------------------------------------------------------------------
+
 Clients:
 
 DMA clients connected to the A31 DMA controller must use the format
-- 
2.14.1