Re: [PATCH v3] gpio: pl061: Support implementations without GPIOINTR line

[Alexander Sverdlin]

Hello Andy,

>> From: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxx>
>>
>> There are several implementations of PL061 which lack GPIOINTR signal in
>> hardware and only have individual GPIOMIS[7:0] interrupts. Use the
>> hierarchical interrupt support of the gpiolib in these cases (if at least 8
>> IRQs are configured for the PL061).
>>
>> One in-tree example is arch/arm/boot/dts/axm55xx.dtsi, PL061 instances have
>> 8 IRQs defined, but current driver supports only the first one, so only one
>> pin would work as IRQ trigger.
> 
> an IRQ
> 
> I'm wondering if the GPIO library support for IRQ hierarchy is what
> you are looking for.

do you have a better suggestion? That's why I reference the below discussion from 2017, where 
Linus Walleij suggested to use it. Well, the initial patch was just 11-liner and PL061 is
rather counterexample and doesn't fit well into the existing hierarchical infrastructure. 

>> Link: https://lore.kernel.org/linux-gpio/CACRpkdZpYzpMDWqJobSYH=JHgB74HbCQihOtexs+sVyo6SRJdA@xxxxxxxxxxxxxx/

[...]

>> --- a/drivers/gpio/Kconfig
>> +++ b/drivers/gpio/Kconfig
>> @@ -469,6 +469,7 @@ config GPIO_PL061
>>         depends on ARM_AMBA
>>         select IRQ_DOMAIN
>>         select GPIOLIB_IRQCHIP
>> +       select IRQ_DOMAIN_HIERARCHY

-- 
Best regards,
Alexander Sverdlin.