lkml.org 
[lkml]   [2017]   [Sep]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v4 6/6] gpio: uniphier: add UniPhier GPIO controller driver
Hi Rob,


2017-09-08 4:41 GMT+09:00 Rob Herring <robh+dt@kernel.org>:
> On Thu, Sep 7, 2017 at 6:42 AM, Masahiro Yamada
> <yamada.masahiro@socionext.com> wrote:
>> This GPIO controller device is used on UniPhier SoCs.
>>
>> It also serves as an interrupt controller, but interrupt signals are
>> just delivered to the parent irqchip without any latching or OR'ing.
>> This is implemented by using hierarchy IRQ domain.
>>
>> Implementation note:
>> Unfortunately, the IRQ mapping from this controller to the parent is
>> random. (48, 49, ..., 63, 154, 155, ...)
>> If "interrupts" property is used, IRQ resources may be statically
>> allocated when platform devices are populated from DT. This can be
>> a problem for the hierarchy IRQ domain because IRQ allocation must
>> happen from the outer-most domain up to the root domain in order to
>> build up the stacked IRQ. (https://lkml.org/lkml/2017/7/6/758)
>> Solutions to work around it could be to hard-code parent hwirqs or
>> to invent a driver-specific DT property.
>>
>> Here, the new API irq_domain_push_irq() was merged by v4.14-rc1.
>> It allows to add irq_data to the existing hierarchy. It will help
>> to make this driver work whether the parent has already initialized
>> the hierarchy or not.
>>
>> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
>> ---
>>
>> Changes in v4:
>> - Add COMPILE_TEST and select IRQ_DOMAIN_HIERARCHY
>> - Reimplement irqchip part by using irq_domain_push_irq()
>>
>> Changes in v3:
>> - Add .irq_set_affinity() hook
>> - Use irq_domain_create_hierarchy() instead of legacy
>> irq_domain_add_hierarchy()
>>
>> Changes in v2:
>> - Remove +32 offset for parent interrupts to follow the GIC
>> binding convention
>> - Let uniphier_gpio_irq_alloc() fail if nr_irqs != 1
>> - Allocate gpio_chip statically because just one instance is
>> supported
>> - Fix suspend and resume hooks
>>
>> .../devicetree/bindings/gpio/gpio-uniphier.txt | 43 ++
>
> What happened to my ack? One line here more that before, but I'm not
> going to diff your patches for you.

I changed the binding for this version.
It includes a new one you have not acked yet.

Maybe I was too worried about it.


> BTW, it is preferred to split bindings to a separate patch.

I will do so next time.



--
Best Regards
Masahiro Yamada

\
 
 \ /
  Last update: 2017-09-08 17:16    [W:0.073 / U:7.488 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site