linux-kernel - Re: [PATCH] dma: Add Xilinx ZDMA device tree Binding Documentation

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Message-ID: <BN1BFFO11FD01214F9392FD94A0D30D9E28C190@BN1BFFO11FD012.protection.gbl>
Date:	Tue, 10 Mar 2015 17:01:26 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>
CC:	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<devicetree@...r.kernel.org>, <michal.simek@...inx.com>,
	<linux-kernel@...r.kernel.org>,
	Punnaiah Choudary Kalluri <punnaia@...inx.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] dma: Add Xilinx ZDMA device tree Binding Documentation

On Tue, 2015-03-10 at 07:46PM +0530, Punnaiah Choudary Kalluri wrote:
> Device-tree binding documentation for Xilinx ZDMA Engine
> 
> Signed-off-by: Punnaiah Choudary Kalluri <punnaia@...inx.com>
> ---
>  .../devicetree/bindings/dma/xilinx/zdma.txt        |   76 ++++++++++++++++++++
>  1 files changed, 76 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/dma/xilinx/zdma.txt
> 
> diff --git a/Documentation/devicetree/bindings/dma/xilinx/zdma.txt b/Documentation/devicetree/bindings/dma/xilinx/zdma.txt
> new file mode 100644
> index 0000000..399a3bc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/xilinx/zdma.txt
> @@ -0,0 +1,76 @@
> +Xilinx ZDMA engine, it does support memory to memory transfers,
> +memory to device and device to memory transfers. It also has flow
> +control and rate control support for slave/peripheral dma access.
> +
> +Xilinx ZynqMP has two instances of general purpose DMA(ZDMA).
> +one is located in FPD(full power domain) and other is located in
> +LPD(low power domain).
> +
> +ZDMA instance located in FPD is referred as FPDMA and instance located
> +in LPD is referred as LPDMA.
> +
> +FPDMA is configured with 8 DMA channels and AXI bus width is 128 byte.
> +LPDMA is configured with 8 DMA channels and AXI bus width is 64 byte.

All these implementation details are good background information, but
shouldn't be part of the binding.

	Sören
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