Running dtbs_check with ARCH=loongarch emits a lot of warnings, most
about describing sideband interrupts for PCI devices through interrupts
property, and usage of undocumented msi-parent property in pcie
controller in loongson-2k2000.dtsi.

Patch 1 solves the former problem by using interrupts-extended property
for these devices. I don't have LS2K1000/2000 devices on hand, so
helping in testing it will be appreciated. msi-parent property is
documented in the second patch for Loongson PCI controllers.

After applying the series, the only two warnings left are about naming
of I2C controllers,

/builder/repo/linux/arch/loongarch/boot/dts/loongson-2k1000-ref.dtb: i2c-gpio-0 (i2c-gpio): $nodename:0: 'i2c-gpio-0' does not match '^i2c(@.+|-[a-z0-9]+)?$'
	from schema $id: http://devicetree.org/schemas/i2c/i2c-gpio.yaml#
/builder/repo/linux/arch/loongarch/boot/dts/loongson-2k1000-ref.dtb: i2c-gpio-1 (i2c-gpio): $nodename:0: 'i2c-gpio-1' does not match '^i2c(@.+|-[a-z0-9]+)?$'
	from schema $id: http://devicetree.org/schemas/i2c/i2c-gpio.yaml#

which IMHO is a regression caused by dt-schema commit 57138f5b8c92
("schemas: i2c: Avoid extra characters in i2c nodename pattern"). Commit
647181a1f8ff ("schemas: i2c: Allow for 'i2c-.*' node names") fails to
fix the case, as it doesn't take nodenames with multiple hyphens in
account. I'll start a separate series for this.

Thanks for your time and review.

Yao Zi (2):
  LoongArch: dts: Describe PCI sideband IRQ through interrupt-extended
  dt-bindings: PCI: loongson: Document msi-parent property

 .../devicetree/bindings/pci/loongson.yaml     |  2 ++
 arch/loongarch/boot/dts/loongson-2k1000.dtsi  | 25 ++++++---------
 arch/loongarch/boot/dts/loongson-2k2000.dtsi  | 32 +++++++------------
 3 files changed, 23 insertions(+), 36 deletions(-)

-- 
2.51.2