linux-kernel - Re: [PATCH (v6) 1/2] mtd: brcmnand: Add brcm,bcm63268-nand device tree binding

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Date:	Wed, 2 Dec 2015 20:12:32 +0000
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	Rob Herring <robh@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jonas Gorski <jogo@...nwrt.org>,
	bcm-kernel-feedback-list@...adcom.com,
	Kamal Dasu <kdasu.kdev@...il.com>
Subject: Re: [PATCH (v6) 1/2] mtd: brcmnand: Add brcm,bcm63268-nand device
 tree binding

On 02/12/15 20:00, Brian Norris wrote:
> Hi,
> 
> On Wed, Dec 02, 2015 at 07:41:07PM +0000, Simon Arlott wrote:
>> >> +	nand0: nandcs@0 {
>> >> +		compatible = "brcm,nandcs";
>> >> +
>> >> +		#address-cells = <0>;
>> >> +		#size-cells = <0>;
> 
>> I think they're also implicit so you can just remove those two lines.
> 
> From ePAPR: "The #address-cells and #size-cells properties are not
> inherited from ancestors in the device tree. They shall be explicitly
> defined."
> 
> But we don't want to define them. I'd drop them, at least from the
> example, as they're not relevant.

Ok.

>> I've created a bcm963268part driver so there won't need to be any
>> partitions in DT for bcm63268.
> 
> Just curious, do you plan to submit this driver? We're working on

Yes, it's just the most recent one I've been working on. I still have
USBH and IUDMA to submit

> matching up partition parsers to flash devices via device tree
> of_match_table's, so you could do something like this:
> 
> 	nand0: nandcs@0 {
> 		compatible = "brcm,nandcs";
> 		...
> 
> 		partitions {
> 			compatible = "brcm,bcm963268-partitions";
> 			...
> 		};
> 	};

I modified brcmnand to look for a machine matching "brcm,bcm963268", but
that way is ok with me. Presumably "ofpart" defers to another matching
partition parser?

Is there a patch for that method of parser detection available?

-- 
Simon Arlott
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