[PATCH v4 0/4] irqchip: dw-apb-ictl: support hierarchy irq domain

[Zhen Lei <thunder.leizhen@huawei.com>]

v3 --> v4:
1. remove "gc->chip_types[0].chip.irq_eoi = irq_gc_noop;", the "chip.irq_eoi" hook
   is not needed by handle_level_irq(). Thanks for Marc Zyngier's review.
2. Add a new patch: define an empty function set_handle_irq() if !GENERIC_IRQ_MULTI_HANDLER
   to avoid compilation error on arch/arc system.

v2 --> v3:
1. change (1 << hwirq) to BIT(hwirq).
2. change __exception_irq_entry to __irq_entry, so we can "#include <linux/interrupt.h>"
   instead of "#include <asm/exception.h>". Ohterwise, an compilation error will be
   reported on arch/csky.
   drivers/irqchip/irq-dw-apb-ictl.c:20:10: fatal error: asm/exception.h: No such file or directory
3. use "if (!parent || (np == parent))" to determine whether it is primary interrupt controller.
4. make the primary interrupt controller case also use function handle_level_irq(), I used 
   handle_fasteoi_irq() as flow_handler before.
5. Other minor changes are not detailed.

v1 --> v2:
According to Marc Zyngier's suggestion, discard adding an independent SD5203-VIC
driver, but make the dw-apb-ictl irqchip driver to support hierarchy irq domain.
It was originally available only for secondary interrupt controller, now it can
also be used as primary interrupt controller. The related dt-bindings is updated
appropriately.

Add "Suggested-by: Marc Zyngier <maz@kernel.org>".
Add "Tested-by: Haoyu Lv <lvhaoyu@huawei.com>".


v1:
The interrupt controller of SD5203 SoC is VIC(vector interrupt controller), it's
based on Synopsys DesignWare APB interrupt controller (dw_apb_ictl) IP, but it
can not directly use dw_apb_ictl driver. The main reason is that VIC is used as
primary interrupt controller and dw_apb_ictl driver worked for secondary
interrupt controller. So add a new driver: "hisilicon,sd5203-vic".


Zhen Lei (4):
  genirq: define an empty function set_handle_irq() if
    !GENERIC_IRQ_MULTI_HANDLER
  irqchip: dw-apb-ictl: prepare for support hierarchy irq domain
  irqchip: dw-apb-ictl: support hierarchy irq domain
  dt-bindings: dw-apb-ictl: support hierarchy irq domain

 .../interrupt-controller/snps,dw-apb-ictl.txt      | 14 +++-
 drivers/irqchip/Kconfig                            |  2 +-
 drivers/irqchip/irq-dw-apb-ictl.c                  | 83 ++++++++++++++++++----
 include/linux/irq.h                                |  2 +
 4 files changed, 87 insertions(+), 14 deletions(-)

-- 
1.8.3