Our irq_chip data structure currently suffers from two problems:
(1) the 'name' field is often dynamically populated with a reference
to the underlying HW (DT node dame, for example)
(2) the 'parent_device' which is used to implement runtime PM is also
dynamically populated
(3) there is at least one instance of a subsystem messing with the
internals of irq_chip structures (gpiochip_set_irq_hooks is
what I know about)
These things mean that although the primary use of irq_chip is to only
contain function pointers and other *static* information, the above
two fields result in these structures being copied in a number of
drivers. Eventually, it would be much better if the various drivers
would use irq_chip as an 'ops' data structure (potentially made
read-only), and keep the dynamic information somewhere more suitable.
For (2) we already have the irqdomain structure that is designed to
deal with the context in which interrupts are used, and it makes sense
to move the 'parent_device' field over to this structure. This is what
this small series is doing, with some minor cleanup on the way.
(1) and (3) will be dealt in separate series (and I don't have a good
solution for (3) yet).
Thanks,
M.
Marc Zyngier (12):
genirq: Allow the PM device to originate from irq domain
irqchip/gic: Move PM device over to irq domain
irqchip/renesas-intc-gpio: Move PM device over to irq domain
irqchip/renesas-irqc: Move PM device over to irq domain
irqchip/imx-intmux: Move PM device over to irq domain
gpio: mt7621: Kill parent_device usage
gpio: omap: Move PM device over to irq domain
gpio: rcar: Move PM device over to irq domain
gpio: tpmx86: Move PM device over to irq domain
pinctrl: npcm: Fix broken references to chip->parent_device
pinctrl: starfive: Move PM device over to irq domain
genirq: Kill irq_chip::parent_device
drivers/gpio/gpio-mt7621.c | 1 -
drivers/gpio/gpio-omap.c | 7 ++++---
drivers/gpio/gpio-rcar.c | 2 +-
drivers/gpio/gpio-tqmx86.c | 3 ++-
drivers/irqchip/irq-gic.c | 12 +++++------
drivers/irqchip/irq-imx-intmux.c | 8 +++-----
drivers/irqchip/irq-renesas-intc-irqpin.c | 3 ++-
drivers/irqchip/irq-renesas-irqc.c | 3 ++-
drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c | 25 +++++++++++------------
drivers/pinctrl/pinctrl-starfive.c | 3 ++-
include/linux/irq.h | 2 --
include/linux/irqdomain.h | 10 +++++++++
kernel/irq/chip.c | 20 +++++++++++++-----
13 files changed, 59 insertions(+), 40 deletions(-)
--
2.30.2
