[PATCH 0/2] regmap IRQ support for devices with multiple IRQs

Matti Vaittinen
2024-07-01T10:58:34Z

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Devices can provide multiple interrupt lines. One reason for this is that
a device has multiple subfunctions, each providing its own interrupt line.
Another reason is that a device can be designed to be used (also) on a
system where some of the interrupts can be routed to another processor.

A line often further acts as a demultiplex for specific interrupts
and has it's respective set of interrupt (status, mask, ack, ...)
registers.

Regmap supports the handling of these registers and demultiplexing
interrupts, but interrupt domain code ends up assigning the same name for
the per interrupt line domains

This series adds possibility for giving a name suffix for an interrupt
domain when regmap is used for devices with multiple interrupt lines.

Series is created on top of the:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git irq/core

which contains the changes by Herve Codina adding both the
struct irq_domain_info and the irq_domain_instantiate().

Previous discussion can be found from:
https://lore.kernel.org/all/87plst28yk.ffs@tglx/
https://lore.kernel.org/all/15685ef6-92a5-41df-9148-1a67ceaec47b@gmail.com/

The domain suffix support added in this series will be used by the
ROHM BD96801 ERRB IRQ support code. The BD96801 ERRB support will need
the initial BD96801 driver code, which is not yet in irq/core or regmap
trees. Thus the user for this new support is not included in the series,
but will be sent once the name suffix support gets merged.

---

Matti Vaittinen (2):
irqdomain: Allow giving name suffix for domain
regmap: Allow setting IRQ domain name suffix

drivers/base/regmap/regmap-irq.c | 39 +++++++++++++++++++++++---------
include/linux/irqdomain.h | 3 +++
include/linux/regmap.h | 4 ++++
kernel/irq/irqdomain.c | 36 +++++++++++++++++++++--------
4 files changed, 62 insertions(+), 20 deletions(-)

base-commit: be5e5f3a1120bada0cff1bc84c2a1805da308f6e
--
2.45.1

--
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =]

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