[PATCH v3 0/3] irqchip: dw-apb-ictl: support hierarchy irq domain

From: Zhen Lei
Date: Wed Sep 09 2020 - 02:59:29 EST

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

Add "Suggested-by: Marc Zyngier <maz@xxxxxxxxxx>".
Add "Tested-by: Haoyu Lv <lvhaoyu@xxxxxxxxxx>".

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 (3):
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 | 85 ++++++++++++++++---
3 files changed, 87 insertions(+), 14 deletions(-)