linux-kernel - Re: [PATCH 2/3] mtd: davinci-nand: add dts property for NAND_NO_SUBPAGE

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Date:	Thu, 20 Mar 2014 13:37:42 -0400
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Brian Norris <computersforpeace@...il.com>
CC:	Ivan Khoronzhuk <ivan.khoronzhuk@...com>, <dwmw2@...radead.org>,
	<galak@...eaurora.org>, <robh+dt@...nel.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<rob@...dley.net>, <linux@....linux.org.uk>,
	<grygorii.strashko@...com>, <devicetree@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mtd@...ts.infradead.org>,
	Murali Karicheri <m-karicheri2@...com>
Subject: Re: [PATCH 2/3] mtd: davinci-nand: add dts property for NAND_NO_SUBPAGE_WRITE
 option



On Thursday 20 March 2014 01:29 PM, Brian Norris wrote:
> On Thu, Mar 20, 2014 at 01:12:35PM -0400, Santosh Shilimkar wrote:
>> Boris,
>
> Who's Boris? And why should Boris be taking this patch? It's an MTD
> patch.
> 
I got your name completely wrong. Sorry....

>> On Thursday 20 March 2014 01:06 PM, Ivan Khoronzhuk wrote:
>>> From: Murali Karicheri <m-karicheri2@...com>
>>>
>>> After testing NAND flash with ubifs for k2hk-emv board were committed
>>> that flash doesn't support subpage writing, so we can fix it by
>>> adding a property to disable subpage write.
> 
> What flash? We try to autodetect NAND as much as possible. Perhaps we
> should be adding infrastructure support instead of hacking it with a DT
> property.
>
We can't auto detect it and thats why the DT approach was taken. We
will double check that.

>>> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
>>> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...com>
>>> ---
>> Can you please pick this up for 3.15 fixes ? Ofcourse assuming DT folks
>> are ok with the patch.
>>
>> I can then take patch 1/3 and 3/3 in my 3.15 fixes queue.
>>
>>>  Documentation/devicetree/bindings/mtd/davinci-nand.txt | 2 ++
>>>  drivers/mtd/nand/davinci_nand.c                        | 3 +++
>>>  2 files changed, 5 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/mtd/davinci-nand.txt b/Documentation/devicetree/bindings/mtd/davinci-nand.txt
>>> index cfb18ab..50af930 100644
>>> --- a/Documentation/devicetree/bindings/mtd/davinci-nand.txt
>>> +++ b/Documentation/devicetree/bindings/mtd/davinci-nand.txt
>>> @@ -53,6 +53,8 @@ Recommended properties :
>>>  				identifier is saved in OOB area. If not present
>>>  				false.
>>>  
>>> +- ti,davinci-nosubpage-write:	disable subpage write for the device
> 
> If we really need the DT property, I'd prefer a generic
> "nand-numer-of-partial-programs" or something like that, and if it's
> equal to 1, then the flash doesn't support partial page programming.
>
OK. It can be updated as you suggested.
 
Thanks for quick response and sorry for the rename

Regards,
Santosh


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