[PATCH v4 13/21] ARM: omap: convert wakeupgen to stacked domains

[Tony Lindgren]

* Marc Zyngier <marc.zyngier at arm.com> [150119 01:48]:
> OMAP4/5 has been (ab)using the gic_arch_extn to provide
> wakeup from suspend, and it makes a lot of sense to convert
> this code to use stacked domains instead.
> 
> This patch does just this, updating the DT files to actually
> reflect what the HW provides.
> 
> BIG FAT WARNING: because the DTs were so far lying by not
> exposing the WUGEN HW block, kernels with this patch applied
> won't have any suspend-resume facility when booted with old DTs,
> and old kernels with updated DTs won't even boot.
> 
> On a platform with this patch applied, the system looks like
> this:
> 
> root at bacon-fat:~# cat /proc/interrupts
>             CPU0       CPU1
>  16:          0          0     WUGEN  37  gp_timer
>  19:     233799     155916       GIC  27  arch_timer
>  23:          0          0     WUGEN   9  l3-dbg-irq
>  24:          1          0     WUGEN  10  l3-app-irq
>  27:        282          0     WUGEN  13  omap-dma-engine
>  44:          0          0  4ae10000.gpio  13  DMA

You may want to update this part for the fix :)

I gave this a quick boot test on am437x-gp-evm and the
interrupts look OK with the fix also applied:

# cat /proc/interrupts 
            CPU0       
 16:        657     WUGEN  68  gp_timer
 18:          0     WUGEN   9  l3-dbg-irq
 19:          0     WUGEN  10  l3-app-irq
 20:          5     WUGEN  12  edma
 22:          0     WUGEN  14  edma_error
 23:         96     WUGEN  72  OMAP UART0
 33:          0  44e07000.gpio   6  mmc0
158:         52     WUGEN  70  44e0b000.i2c
159:          0     WUGEN  71  4802a000.i2c
160:         35     WUGEN  64  mmc0
161:          0     WUGEN  40  4a100000.ethernet
162:       7739     WUGEN  41  4a100000.ethernet
163:       7608     WUGEN  42  4a100000.ethernet
164:          0     WUGEN  43  4a100000.ethernet
170:          0     WUGEN 100  gpmc
180:          0     WUGEN   7  tps65218
IPI0:          0  CPU wakeup interrupts
IPI1:          0  Timer broadcast interrupts
IPI2:          0  Rescheduling interrupts
IPI3:          0  Function call interrupts
IPI4:          0  Single function call interrupts
IPI5:          0  CPU stop interrupts
IPI6:          0  IRQ work interrupts
IPI7:          0  completion interrupts
Err:          0

Also verified that suspend and resume to a serial console event
works on omap4430-sdp. So please feel free to add:

Acked-by: Tony Lindgren <tony at atomide.com>