From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexandre Belloni <alexandre.belloni@bootlin.com>
Subject: Re: [PATCH 2/3] dt-bindings: mfd: atmel-usart: add DMA bindings for
 SPI mode
Date: Wed, 21 Nov 2018 17:48:20 +0100
Message-ID: <20181121164820.GC12656@piout.net>
References: <20181121112732.15690-1-radu_nicolae.pirea@upb.ro>
 <20181121112732.15690-3-radu_nicolae.pirea@upb.ro>
 <CAL_JsqLNURZTWCb5WOyJvN-trUP9r-ueftwUOGWPnrEaQPBKSw@mail.gmail.com>
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Cc: radu_nicolae.pirea@upb.ro,
        Richard Genoud <richard.genoud@gmail.com>,
        Lee Jones <lee.jones@linaro.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Nicolas Ferre <nicolas.ferre@microchip.com>,
        Ludovic Desroches <ludovic.desroches@microchip.co>,
        Mark Brown <broonie@kernel.org>, devicetree@vger.kernel.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
        <linux-arm-kernel@lists.infradead.org>,
        linux-spi <linux-spi@vger.kernel.org>
To: Rob Herring <robh+dt@kernel.org>
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Hi Rob,

On 21/11/2018 10:41:01-0600, Rob Herring wrote:
> > +Optional properties in serial and SPI mode:
> > +- dma bindings for dma transfer:
> > +       - dmas: DMA specifier, consisting of a phandle to DMA controller node,
> > +               memory peripheral interface and USART DMA channel ID, FIFO configuration.
> > +               Refer to dma.txt and atmel-dma.txt for details.
> > +       - dma-names: "rx" for RX channel, "tx" for TX channel.
> 
> > +               dma-names = "tx", "rx";
> 
> The dma-names should have a defined order.
> 

Why is that? Isn't the purpose of names to get rid of any particular
ordering?


-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com