linux-kernel - Re: [PATCH 1/2] dt: dma: Add DT binding document for jz4780-dma

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Message-ID: <2670922.EEM3IMjO9B@wuerfel>
Date:	Thu, 29 Jan 2015 14:10:36 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>
Cc:	vinod.koul@...el.com, dan.j.williams@...el.com,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org
Subject: Re: [PATCH 1/2] dt: dma: Add DT binding document for jz4780-dma

On Thursday 29 January 2015 12:19:38 Zubair Lutfullah Kakakhel wrote:
> 
> +1. Transmit request type: The DMA request type for transfers to the device on
> +   the allocated channel, as defined in the SoC documentation. If set to 0,
> +   transfers to the device will not be allowed on the channel.
> +
> +2. Receive request type: The DMA request type for transfers from the device on
> +   the allocated channel, as defined in the SoC documentation. If set to 0,
> +   transfers from the device will not be allowed on the channel.

It's fairly unusual to have separate fields for these two, most other
driver just use one. What would be a use-case for passing both?

	Arnd
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