[V2] dt-bindings: fsl-qdma: add device tree for qDMA driver
From: Wen He <hidden>
Date: 2017-12-25 07:40:33
Also in:
dmaengine
Subsystem:
dma generic offload engine subsystem, open firmware and flattened device tree bindings, the rest · Maintainers:
Vinod Koul, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
add NXP Layerscape queue direct memory access controller(qDMA) support. This module can be found on NXP QorIQ Layerscape Socs. Signed-off-by: Wen He <redacted> --- change in v2: - Remove indentation - Add "Should be" before 'fsl,ls1021a-qdma' - Replace 'channels' by 'dma-channels' - Replace 'qdma@8390000' by 'dma-controller@8390000' Documentation/devicetree/bindings/dma/fsl-qdma.txt | 40 ++++++++++++++++++++ 1 files changed, 40 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/dma/fsl-qdma.txt
diff --git a/Documentation/devicetree/bindings/dma/fsl-qdma.txt b/Documentation/devicetree/bindings/dma/fsl-qdma.txt
new file mode 100644
index 0000000..000472b
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/fsl-qdma.txt@@ -0,0 +1,40 @@ +* NXP Layerscape queue Direct Memory Access Controller(qDMA) Controller + +The qDMA controller transfers blocks of data between one source and one or more +destinations. The blocks of data transferred can be represented in memory as contiguous +or non-contiguous using scatter/gather table(s). Channel virtualization is supported +through enqueuing of DMA jobs to, or dequeuing DMA jobs from, different work +queues. + +* qDMA Controller +Required properties: +- compatible : Should be "fsl,ls1021a-qdma" or "fsl,ls1043a-qdma", "fsl,ls1021a-qdma" +- reg : Specifies base physical address(s) and size of the qDMA registers. + The region is qDMA control register's address and size. +- interrupts : A list of interrupt-specifiers, one for each entry in + interrupt-names. +- interrupt-names : Should contain: + "qdma-error" - the error interrupt + "qdma-queue" - the queue interrupt +- dma-channels : Number of DMA channels supported by the controller +- queues : Number of queues supported by driver + +Optional properties: +- big-endian: If present registers and hardware scatter/gather descriptors + of the qDMA are implemented in big endian mode, otherwise in little + mode. + + +Examples: + + qdma: dma-controller@8390000 { + compatible = "fsl,ls1021a-qdma"; + reg = <0x0 0x8398000 0x0 0x2000 /* Controller registers */ + 0x0 0x839a000 0x0 0x2000>; /* Block registers */ + interrupts = <GIC_SPI 185 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>; + interrupt-names = "qdma-error", "qdma-queue"; + dma-channels = <8>; + queues = <2>; + big-endian; + };
--
1.7.1
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