regmap: irq: Avoid lockdep warnings with nested regmap-irq chips

regmap: irq: Avoid lockdep warnings with nested regmap-irq chips

While handling interrupts through regmap-irq we use a mutex to protect the
updates we are caching while genirq runs in atomic context. Russell King
reported that while running on the nVidia Jetson Xavier NX this generates
lockdep warnings since that platform has a regmap-irq for the max77686 RTC
which is a child of a max77620 which also uses regmap-irq.

[   46.723127] rtcwake/3984 is trying to acquire lock:
[   46.723235] ffff0000813b2c68 (&d->lock){+.+.}-{4:4}, at: regmap_irq_lock+0x18/0x24
[   46.723452]
               but task is already holding lock:
[   46.723556] ffff00008504dc68 (&d->lock){+.+.}-{4:4}, at: regmap_irq_lock+0x18/0x24

This happens because by default lockdep uses a single lockdep class for all
mutexes initialised from a single mutex_init() call and is unable to tell
that two distinct mutex are being taken and verify that the ordering of
operations is safe. This should be a very rare situation since normally
anything using regmap-irq will be a leaf interrupt controller due to being
on a slow bus like I2C.

We can avoid these warnings by providing the lockdep key for the regmap-irq
explicitly, allocating one for each chip so that lockdep can distinguish
between them.

Thanks to Russell for the report and analysis.

Reported-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Tested-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20250731-regmap-irq-nesting-v1-2-98b4d1bf20f0@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>