linux-kernel - Re: [PATCH v3 00/27] memory: omap-gpmc: mtd: nand: Support GPMC NAND on non-OMAP platforms

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Message-ID: <20151006110134.GO23801@atomide.com>
Date:	Tue, 6 Oct 2015 04:01:34 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Roger Quadros <rogerq@...com>
Cc:	devicetree@...r.kernel.org, linux-omap@...r.kernel.org,
	nsekhar@...com, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, ezequiel@...guardiasur.com.ar,
	javier@...hile0.org, computersforpeace@...il.com,
	dwmw2@...radead.org, fcooper@...com
Subject: Re: [PATCH v3 00/27] memory: omap-gpmc: mtd: nand: Support GPMC NAND
 on non-OMAP platforms

* Roger Quadros <rogerq@...com> [151006 03:32]:
> On 06/10/15 13:05, Roger Quadros wrote:
> > On 06/10/15 13:00, Tony Lindgren wrote:
> >> * Roger Quadros <rogerq@...com> [151006 02:59]:
> >>> On 06/10/15 11:33, Tony Lindgren wrote:
> >>>> Does build and boot and use NAND work throughtout the series?
> >>>> Otherwise we'll have hard time bisecting anything..
> >>>
> >>> Yes it does with the following exceptions.
> >>>
> >>> - Patch 7 "memory: omap-gpmc: Remove NAND IRQ code" breaks prefetch-irq mode
> >>> but none of the boards seem to be using it so it shouldn't break NAND on existing boards.
> >>> At patch 9 "mtd: nand: omap2: manage NAND interrupts" prefetch-irq mode is working again.
> >>> Do you want me to squash patches 7,8,9 so that pre-fetch irq is not broken at any point?
> >>
> >> OK, no that's fine, no need to squash them together then.
> >>
> >>> - Then at patch 11 "mtd: nand: omap: Clean up device tree support" we break NAND on all DT
> >>> boards as we expect NAND to be a real child node with compatible id. Simply applying the
> >>> DT patch at this point makes it work again.
> >>
> >> Hmm can we at least warn about incompatible DT entry when somebody boots
> >> with an older dtb?
> > 
> > Yes that could be done. It looks like we can use the missing compatible property to identify
> > that it is and old DT entry.
> > 
> > I'll send a v4 of patch 11.
> 
> There is another issue. Some of the old DT nodes set the NAND IO address to 0.
> As we prevent mapping into first 16MB we see the following message for those nodes. e.g. dra7-evm
> 
> [    1.727598] omap-gpmc 50000000.gpmc: cannot remap GPMC CS 0 to 0x00000000
> [    1.727605] omap-gpmc 50000000.gpmc: GPMC CS 0 start cannot be lesser than 0x1000000
> [    1.727611] omap-gpmc 50000000.gpmc: failed to probe DT children
> 
> Hope this is good enough information that DT needs to be updated?

Yes I think that should allow users update the out of tree dts file
easily.

Regards,

Tony
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