Convert the m68k virt machine to use the generic goldfish PIC irqchip
driver instead of maintaining a duplicate, platform-specific interrupt
controller implementation in arch/m68k/virt/.

The whole patchset is tested on  qemu-system-m68k -M virt and verified
that interrupts across multiple goldfish PIC instances fire and
increment properly in /proc/interrupts.
---
P.S. From a quick search on lore, Miodrag has been inactive on LKML for
a while. His last appearance was just handing over the goldfish-rtc
driver 6 years ago, and prior to that it goes all the way back to 2017.

With tglx's recent call for irqchip reviews in mind, I actually use and
care about goldfish devices on qemu for both linux and u-boot, so I'm
happy to help review future patches for this driver. I can follow up
with a MAINTAINERS patch if that sounds good.

Kuan-Wei Chiu (6):
  irqchip/goldfish-pic: Use gf_ioread32/gf_iowrite32 for MMIO access
  irqchip/goldfish-pic: Use for_each_set_bit() to iterate pending IRQ
  irqchip/goldfish-pic: Allow selecting CONFIG_GOLDFISH_PIC on other
    architectures
  irqchip/goldfish-pic: Add goldfish_pic_init() for non DT platforms
  m68k/irq: Add empty irq_eoi callback to auto/user IRQ chips
  m68k: virt: Switch to generic goldfish-pic driver

 MAINTAINERS                              |   1 +
 arch/m68k/Kconfig.machine                |   1 +
 arch/m68k/kernel/ints.c                  |   6 ++
 arch/m68k/virt/ints.c                    |  89 ++----------------
 drivers/irqchip/Kconfig                  |   2 +-
 drivers/irqchip/irq-goldfish-pic.c       | 113 +++++++++++++++--------
 include/linux/irqchip/irq-goldfish-pic.h |  15 +++
 7 files changed, 105 insertions(+), 122 deletions(-)
 create mode 100644 include/linux/irqchip/irq-goldfish-pic.h

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2.55.0.979.g7e5102b832-goog