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Date: Fri, 26 Apr 2013 08:26:16 +0200 (CEST)
From: Guennadi Liakhovetski <g.liakhovetski@....de>
To: devicetree-discuss@...ts.ozlabs.org
cc: Arnd Bergmann <arnd@...db.de>, Vinod Koul <vinod.koul@...el.com>,
linux-sh@...r.kernel.org, Magnus Damm <magnus.damm@...il.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 7/6] DMA: shdma: add DT binding documentation
SHDMA uses only standard DMA Device Tree bindings. This patch adds
documentation, exactly describing the use of the bindings and providing
examples.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>
---
This patch adds the missing documentation to the patch series "DMA: shdma:
add Device Tree support"
http://thread.gmane.org/gmane.linux.ports.sh.devel/21972
Arnd, Vinod, I hope, now this series can be applied :)
Documentation/devicetree/bindings/dma/shdma.txt | 61 +++++++++++++++++++++++
1 files changed, 61 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/dma/shdma.txt
diff --git a/Documentation/devicetree/bindings/dma/shdma.txt b/Documentation/devicetree/bindings/dma/shdma.txt
new file mode 100644
index 0000000..f99618e
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/shdma.txt
@@ -0,0 +1,61 @@
+* SHDMA Device Tree bindings
+
+Only generic DMA controller bindings are used for SHDMA DT nodes.
+
+* DMA controller
+
+Required properties:
+- compatible: should be "renesas,shdma"
+- #dma-cells: should be <1>, see "dmas" property below
+
+Optional properties (currently unused):
+- dma-channels: number of DMA channels
+- dma-requests: number of DMA request signals
+
+Example:
+ dma0: shdma@...00020 {
+ compatible = "renesas,shdma";
+ reg = <0xfe000020 0x89e0>;
+ interrupt-parent = <&gic>;
+ interrupts = <0 129 4
+ 0 109 4
+ 0 110 4
+ 0 111 4
+ 0 112 4
+ 0 113 4
+ 0 114 4
+ 0 115 4
+ 0 116 4
+ 0 117 4
+ 0 118 4
+ 0 119 4
+ 0 120 4
+ 0 121 4
+ 0 122 4
+ 0 123 4
+ 0 124 4
+ 0 125 4
+ 0 126 4
+ 0 127 4
+ 0 128 4>;
+ interrupt-names = "error",
+ "ch0", "ch1", "ch2", "ch3",
+ "ch4", "ch5", "ch6", "ch7",
+ "ch8", "ch9", "ch10", "ch11",
+ "ch12", "ch13", "ch14", "ch15",
+ "ch16", "ch17", "ch18", "ch19";
+ #dma-cells = <1>;
+ dma-channels = <20>;
+ dma-requests = <256>;
+ };
+
+* DMA client
+
+Required properties:
+- dmas: a list of <[DMA controller phandle] [MID/RID value]> pairs
+- dma-names: a list of DMA channel names, one per "dmas" entry
+
+Example:
+ dmas = <&dma0 0xd1
+ &dma0 0xd2>;
+ dma-names = "tx", "rx";
--
1.7.2.5
--
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