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 13:35:56 +0200
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>,
	"Khoronzhuk, Ivan" <ivan.khoronzhuk@...com>
CC:	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 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?

>
> Other than that patch looks fine to me.
>
> Regards,
> Santosh
>

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