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SubjectRe: Delivery Status Notification (Failure)

I need one help.
I am using i.MX7 Sabre board with kernel version 4.1.15

Let's say I am interested in GPIO number: 21
I wanted to set CPU affinity for particular GPIO->IRQ number, so I
tried the below steps:
root@10:~# echo 21 > /sys/class/gpio/export
root@10:~# echo "rising" > /sys/class/gpio/gpio21/edge
root@10:~# cat /proc/interrupts | grep 21
47: 0 0 gpio-mxc 21 Edge gpiolib
root@10:~# cat /sys/class/gpio/gpio21/direction
root@10:~# cat /proc/irq/47/smp_affinity
root@10:~# echo 2 > /proc/irq/47/smp_affinity
-bash: echo: write error: Input/output error

But I get input/output error.
When I debug further, found that irq_can_set_affinity is returning 0:
[ 0.000000] genirq: irq_can_set_affinity (0): balance: 1,
irq_data.chip: a81b7e48, irq_set_affinity: (null)
[ 0.000000] write_irq_affinity: FAIL

I also tried first setting /proc/irq/default_smp_affinity to 2 (from 3).
This change is working, but the smp_affinity setting for the new IRQ
is not working.

When I try to set smp_affinity for mmc0, then it works.
# cat /proc/interrupts | grep mmc
295: 55 0 GPCV2 22 Edge mmc0
296: 0 0 GPCV2 23 Edge mmc1
297: 52 0 GPCV2 24 Edge mmc2

root@10:~# echo 2 > /proc/irq/295/smp_affinity

So, I wanted to know what are the conditions for which setting
smp_affinity for an IRQ will work ?

Is there any way by which I can set CPU affinity to a GPIO -> IRQ ?
Whether, irq_set_affinity_hint() will work in this case ?


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