dmaengine: add device tree binding documentation for the nbpfaxi driver
The nbpfaxi dmaengine driver doesn't define any new bindings, it only uses standard dmaengine bindings and defines 3 flags for the 3rd parameter of the "dmas" property. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>hifive-unleashed-5.1
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* Renesas "Type-AXI" NBPFAXI* DMA controllers
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* DMA controller
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Required properties
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- compatible: must be one of
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"renesas,nbpfaxi64dmac1b4"
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"renesas,nbpfaxi64dmac1b8"
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"renesas,nbpfaxi64dmac1b16"
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"renesas,nbpfaxi64dmac4b4"
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"renesas,nbpfaxi64dmac4b8"
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"renesas,nbpfaxi64dmac4b16"
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"renesas,nbpfaxi64dmac8b4"
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"renesas,nbpfaxi64dmac8b8"
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"renesas,nbpfaxi64dmac8b16"
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- #dma-cells: must be 2: the first integer is a terminal number, to which this
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slave is connected, the second one is flags. Flags is a bitmask
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with the following bits defined:
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#define NBPF_SLAVE_RQ_HIGH 1
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#define NBPF_SLAVE_RQ_LOW 2
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#define NBPF_SLAVE_RQ_LEVEL 4
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Optional properties:
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You can use dma-channels and dma-requests as described in dma.txt, although they
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won't be used, this information is derived from the compatibility string.
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Example:
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dma: dma-controller@48000000 {
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compatible = "renesas,nbpfaxi64dmac8b4";
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reg = <0x48000000 0x400>;
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interrupts = <0 12 0x4
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0 13 0x4
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0 14 0x4
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0 15 0x4
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0 16 0x4
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0 17 0x4
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0 18 0x4
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0 19 0x4>;
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#dma-cells = <2>;
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dma-channels = <8>;
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dma-requests = <8>;
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};
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* DMA client
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Required properties:
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dmas and dma-names are required, as described in dma.txt.
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Example:
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#include <dt-bindings/dma/nbpfaxi.h>
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...
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dmas = <&dma 0 (NBPF_SLAVE_RQ_HIGH | NBPF_SLAVE_RQ_LEVEL)
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&dma 1 (NBPF_SLAVE_RQ_HIGH | NBPF_SLAVE_RQ_LEVEL)>;
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dma-names = "rx", "tx";
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@ -0,0 +1,20 @@
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/*
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* Copyright (C) 2013-2014 Renesas Electronics Europe Ltd.
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* Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*/
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#ifndef DT_BINDINGS_NBPFAXI_H
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#define DT_BINDINGS_NBPFAXI_H
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/**
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* Use "#dma-cells = <2>;" with the second integer defining slave DMA flags:
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*/
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#define NBPF_SLAVE_RQ_HIGH 1
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#define NBPF_SLAVE_RQ_LOW 2
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#define NBPF_SLAVE_RQ_LEVEL 4
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#endif
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