Re: [PATCH 03/12] mtd: nand: omap: Move IRQ handling from GPMC to NAND driver

[nick <xerofoify@gmail.com>]

On 2015-07-13 09:01 AM, Tony Lindgren wrote:
> * nick <xerofoify@gmail.com> [150713 05:54]:
>> On 2015-07-13 08:40 AM, Tony Lindgren wrote:
>>> * Roger Quadros <rogerq@ti.com> [150713 03:07]:
>>>  
>>>> What is the best map we should use for irqchip?
>>>> Some Socs have 4 WAIT pins, some have 3 and some have 2.
>>>>
>>>> Should we start with 0,1,2, for the wait pins and use the next
>>>> available free one for the NAND?
>>>
>>> Maybe we can just use the bits defined for each SoC in the
>>> GPMC_IRQSTATUS register for the mapping?  
>>> Regards,
>>
>> Is that a good idea as to my knowledge of OMAP platforms that register is hardware
>> dependent and therefore that may be an issue unless your idea is to create device
>> tables like the way they do in the nand subsystems to support various vendor's 
>> nand flash expect here for the pins on OMAP SOCs.
> 
> Do you mean mapping irqs based on the GPMC_IRQSTATUS register
> bits? If so, that's pretty much how all the GPIO drivers
> handle them. We can have a SoC specific irqmask of the valid
> bits passed from the dts files, and if necessary we can also
> add custom SoC specific IRQ handlers to the GPMC driver if
> needed.
> 
> The idea is that the NAND driver can just request the irq
> from the GPMC driver and do whatever it wants with the
> interrupt.
> 
> Regards,
> 
> Tony
> 
Tony,
That is what I was hoping the code was doing. So what appears to be the problem with the 
patches related to irq requesting from the GPMC driver.
Cheers,
Nick 

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