[PATCH 2/2] PCI: generic: add description of property "interrupt-skip-mask"

Zhen Lei
2016-02-25T11:58:12Z

Interrupt Pin register is read-only and optional. Some pci devices may use
msi/msix but leave the value of Interrupt Pin non-zero. In this case, the
driver will print information as below:
pci 0000:40:00.0: of_irq_parse_pci() failed with rc=-22

It's easily lead to misinterpret.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
Documentation/devicetree/bindings/pci/host-generic-pci.txt | 2 ++
1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.txt b/Documentation/devicetree/bindings/pci/host-generic-pci.txt
index 3f1d3fc..0f10978 100644
--- a/Documentation/devicetree/bindings/pci/host-generic-pci.txt
+++ b/Documentation/devicetree/bindings/pci/host-generic-pci.txt
@@ -70,6 +70,8 @@ Practice: Interrupt Mapping' and requires the following properties:

- interrupt-map-mask : <see aforementioned specification>

+- interrupt-skip-mask: Explicitly declare which pci devices only use msi/msix
+but leave the value of Interrupt Pin non-zero.

Example:

--
2.5.0