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

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Date:	Tue, 6 Oct 2015 14:09:35 +0300
From:	Roger Quadros <rogerq@...com>
To:	Tony Lindgren <tony@...mide.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

On 06/10/15 14:01, Tony Lindgren wrote:
> * 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.

Fine. The updated series is now at

git@...hub.com:rogerq/linux.git
 * [new branch]      for-v4.4/gpmc-v4

cheers,
-roger
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