Subject: [PATCH 06/14] ARM: OMAP2+: Convert NAND to use gpmc_cs_program_settings()

From: [email-masked] (Jon Hunter)
Date: Thu, 28 Feb 2013 10:02:01 -0600

On 02/28/2013 04:38 AM, Philip, Avinash wrote:
> On Tue, Feb 26, 2013 at 23:00:33, Hunter, Jon wrote:
>> Convert the OMAP2+ NAND code to use the gpmc_cs_program_settings()
>> function for configuring the various GPMC options instead of directly
>> programming the CONFIG1 register.
>>
>> This moves the configuration of some GPMC options outside the
>> nand_gpmc_retime() because these options should only need to be set once
>> regardless of whether the gpmc timing is changing dynamically at runtime.
>> The programming of where the wait-pin is also moved slightly, but this
>> will not have any impact to existing devices as no boards are currently
>> setting the dev_ready variable.
>>
>> Signed-off-by: Jon Hunter <[email-masked]>
>> ---
>>  arch/arm/mach-omap2/gpmc-nand.c |   35 +++++++++++++++++++++++------------
>>  1 file changed, 23 insertions(+), 12 deletions(-)
>>
>> diff --git a/arch/arm/mach-omap2/gpmc-nand.c b/arch/arm/mach-omap2/gpmc-nand.c
>> index afc1e8c..4bdfea2 100644
>> --- a/arch/arm/mach-omap2/gpmc-nand.c
>> +++ b/arch/arm/mach-omap2/gpmc-nand.c
>> @@ -43,6 +43,10 @@ static struct platform_device gpmc_nand_device = {
>>  	.resource	= gpmc_nand_resource,
>>  };
>>  
>> +static struct gpmc_settings nand_settings = {
>> +	.device_nand = true,
>> +};
>> +
> 
> Is it possible to make it local variable?
> It would help GPMC to support NAND device on multiple chip select.

Well gpmc_nand_init() will be called for each NAND device and so I don't
see why this would prevent supporting multiple NANDs on multiple
chip-selects.

Once migration to device-tree is complete we could definitely make it
local as there will be no need for any static initialisations of the
structure as all fields would be read from device-tree.

I can make it local now if that is preferred and seeing that will be the
direction once we have migrated to device-tree, is does make sense.

Cheers
Jon