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 15:28:51 -0400
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Ivan Khoronzhuk <ivan.khoronzhuk@...com>,
	Brian Norris <computersforpeace@...il.com>
CC:	Warner Losh <imp@...imp.com>,
	David Woodhouse <dwmw2@...radead.org>, <galak@...eaurora.org>,
	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <rob@...dley.net>,
	Russell King - ARM Linux <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 03:26 PM, Ivan Khoronzhuk wrote:
> 
> On 03/20/2014 09:11 PM, Santosh Shilimkar wrote:
>> On Thursday 20 March 2014 02:54 PM, Brian Norris wrote:
>>> On Thu, Mar 20, 2014 at 02:02:39PM -0400, Santosh Shilimkar wrote:
>>>> On Thursday 20 March 2014 01:44 PM, Warner Losh wrote:
>>>>> I though sub page writing was one of the fields in the onfi and/or jedec(toggle) meta data structures. Have you looked there?
>>>>>
>>>> Am not sure if I follow you. The limitation is from the TI NAND controller(AEMIF) and
>>>> not the NAND memory.
>>> That doesn't match the patch description, which says "that flash doesn't
>>> support subpage writing". Flash != flash controller.
>>>
>> Patch description is indeed doesn't reflect the actual issue.
>>
>>> Which one is it? If it's a controller limitation, I think we should be
>>> able to pull this from a "compatible" property, no?
>>>
>> Just to be accurate, the limitation(bug) is on the controller found on Keystone
>> SOCs. AEMIF controller is also used on DaVinci SOCs which don't seems to have
>> any issue. So even for compatible, you need to add keystone specific one.
>> Hence thought dt property is better option.
>>

> 
> I will use compatible approach.
> We have keystone compatible in k2hk-evm.dts,
> so I need to add it only in the davinci-nand driver.
> I will add the following:
> 
> if (of_device_is_compatible(np, "ti,keystone-nand")) {
>             pdata->options |= NAND_NO_SUBPAGE_WRITE;
>  }
> 
> ...
> 
> static const struct of_device_id davinci_nand_of_match[] = {
>     {.compatible = "ti,davinci-nand", },
>     {.compatible = "ti,keystone-nand", },
>     {},
> };
> 
Looks good. I think you should go ahead and respin the patch
with above.

Regards,
Santosh
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