From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wen He Subject: [v3 3/6] dt-bindings: fsl-qdma: add device tree for qDMA driver Date: Thu, 11 Jan 2018 17:32:12 +0800 Message-ID: <20180111093215.12636-3-wen.he_1@nxp.com> References: <20180111093215.12636-1-wen.he_1@nxp.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <20180111093215.12636-1-wen.he_1-3arQi8VN3Tc@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, leoyang.li-3arQi8VN3Tc@public.gmane.org, jiafei.pan-3arQi8VN3Tc@public.gmane.org, jiaheng.fan-3arQi8VN3Tc@public.gmane.org, Wen He List-Id: devicetree@vger.kernel.org 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 --- change in v3: - no change 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 = , + ; + interrupt-names = "qdma-error", "qdma-queue"; + dma-channels = <8>; + queues = <2>; + big-endian; + }; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html