linux-kernel - Re: [PATCH 10/12] mtd: nand: davinci: don't set timings if AEMIF is used

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Date:	Mon, 18 Nov 2013 09:08:13 -0500
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Grygorii Strashko <grygorii.strashko@...com>
CC:	"Khoronzhuk, Ivan" <ivan.khoronzhuk@...com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Rob Herring <rob.herring@...xeda.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Kumar Gala <galak@...nel.crashing.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Sekhar Nori <nsekhar@...com>
Subject: Re: [PATCH 10/12] mtd: nand: davinci: don't set timings if AEMIF
 is used

On Monday 18 November 2013 06:35 AM, Grygorii Strashko wrote:
> On 11/12/2013 06:13 PM, Santosh Shilimkar wrote:
>> On Monday 11 November 2013 12:10 PM, Khoronzhuk, Ivan wrote:
>>> If Davinci AEMIF is used we don't need to set timings and bus width.
>>> It is done by AEMIF driver (drivers/memory/davinci-aemfi.c).
>>>
>>> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...com>
>>> ---
>>>   drivers/mtd/nand/davinci_nand.c |   22 +++++++++++++++-------
>>>   1 file changed, 15 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
>>> index 4705214..879e915 100644
>>> --- a/drivers/mtd/nand/davinci_nand.c
>>> +++ b/drivers/mtd/nand/davinci_nand.c
>>> @@ -742,27 +742,35 @@ static int __init nand_davinci_probe(struct platform_device *pdev)
>>>                  goto err_clk_enable;
>>>          }
>>>
>>> +#if !IS_ENABLED(CONFIG_TI_DAVINCI_AEMIF)
>>>
>> Instead above #if, just use a variable.
>>     bool aemif = IS_ENABLED(CONFIG_TI_DAVINCI_AEMIF) and then skip
>> the below code. #if block in the middle of the code looks ugly.
> 
> Yes, this is the hack.
> The problem is that this part of code contains the call of Davinci platform function davinci_aemif_setup_timing() which is not accessible if Kernel is built for Keystone only.
> That's why "#if" has been used.
> 
> This part of code has to be removed together with Davinci aemif platform code (aemif.c), once Davinci will be converted to DT and use
> new driver.
> 
> The corresponding comment can be added here. Is it ok?
> 
Thats more or less what I proposed in another reply. Lets clearly
document it on why such a check was added.

Regards,
Santosh

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