linux-kernel - Re: [PATCH v10 5/8] dmaengine: edma: Add TI EDMA device tree binding

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Message-ID: <51BFE4D3.50509@ti.com>
Date:	Tue, 18 Jun 2013 10:10:51 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	"Fernandes, Joel A" <joelagnel@...com>
CC:	Arnd Bergmann <arnd@...db.de>, Tony Lindgren <tony@...mide.com>,
	Matt Porter <matt@...orter.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"Cousson, Benoit" <b-cousson@...com>,
	Russell King <linux@....linux.org.uk>,
	Rob Landley <rob@...dley.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Kridner <jkridner@...gleboard.org>,
	Koen Kooi <koen@...gleboard.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>
Subject: Re: [PATCH v10 5/8] dmaengine: edma: Add TI EDMA device tree binding


On 6/17/2013 9:10 PM, Fernandes, Joel A wrote:
> Hi Arnd,
> 
>> -----Original Message-----
>> From: Arnd Bergmann [mailto:arnd@...db.de]
>> Sent: Monday, June 17, 2013 6:13 AM
>> To: Fernandes, Joel A
>> Cc: Tony Lindgren; Nori, Sekhar; Matt Porter; Grant Likely; Rob Herring; Vinod
>> Koul; Mark Brown; Cousson, Benoit; Russell King; Rob Landley; Andrew
>> Morton; Jason Kridner; Koen Kooi; Devicetree Discuss; Linux OMAP List; Linux
>> ARM Kernel List; Linux DaVinci Kernel List; Linux Kernel Mailing List; Linux
>> Documentation List; Linux MMC List; Linux SPI Devel List
>> Subject: Re: [PATCH v10 5/8] dmaengine: edma: Add TI EDMA device tree
>> binding
>>
>> On Friday 14 June 2013 21:32:47 Joel A Fernandes wrote:
>>>
>>> diff --git a/Documentation/devicetree/bindings/dma/ti-edma.txt
>>> b/Documentation/devicetree/bindings/dma/ti-edma.txt
>>> new file mode 100644
>>> index 0000000..ada0018
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/dma/ti-edma.txt
>>> @@ -0,0 +1,26 @@
>>> +TI EDMA
>>> +
>>> +Required properties:
>>> +- compatible : "ti,edma3"
>>> +- ti,hwmods: Name of the hwmods associated to the EDMA
>>> +- ti,edma-regions: Number of regions
>>> +- ti,edma-slots: Number of slots
>>> +
>>> +Optional properties:
>>> +- ti,edma-xbar-event-map: Crossbar event to channel map
>>
>> You need to list #dma-cells as required here, and which values are accepted
>> by the driver (I suppose only <1>). You should also explain the format of the
>> dma-specifier for a slave here for each possible value of #dma-cells.
>>
>> For each of the standard properties (reg, interrupts, dma-channels), list
>> whether they are optional or required. Since the example has three
>> interrupts, you should probably list how many interrupts need to be specified
>> (minimum and maximum if the number is variable) and in what order to
>> expect them.
>  
> [Joel] Thanks for the suggestion, I updated it and it looks like this now:
>                                                                                                              
> Required properties:                                                                                                                   
> - compatible : "ti,edma3"                                                                                                              
> - ti,hwmods: Name of the hwmods associated to the EDMA  

I have already asked for ti,hwmods to be made optional. Please see my
comment from yesterday.

Thanks,
Sekhar
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