linux-kernel - Re: [PATCH v6 09/10] spi: omap2-mcspi: add generic DMA request support to the DT binding

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Message-Id: <201301300924.00508.arnd@arndb.de>
Date:	Wed, 30 Jan 2013 09:24:00 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Matt Porter <mporter@...com>
Cc:	Tony Lindgren <tony@...mide.com>, Sekhar Nori <nsekhar@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Benoit Cousson <b-cousson@...com>,
	Russell King <linux@....linux.org.uk>,
	Vinod Koul <vinod.koul@...el.com>,
	Rob Landley <rob@...dley.net>, Chris Ball <cjb@...top.org>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Dan Williams <djbw@...com>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v6 09/10] spi: omap2-mcspi: add generic DMA request support to the DT binding

On Wednesday 30 January 2013, Matt Porter wrote:
> +Optional properties:
> +- dmas: List of DMA controller phandle and DMA request ordered
> +       pairs. One tx and one rx pair is required for each chip
> +       select.

The binding looks ok, but the wording is slightly incorrect here:
strictly speaking, it's not a pair of controller phandle and request
line number, but a DMA descriptor as specified in bindings/dma/dma.txt
with a format specific to the dma engine being used. That can
require more than just a single integer request number.

	Arnd
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