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

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Date:	Thu, 25 Feb 2016 19:53:28 +0800
From:	Zhen Lei <thunder.leizhen@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci <linux-pci@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Will Deacon <will.deacon@....com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"Kumar Gala" <galak@...eaurora.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
	"Tianhong Ding" <dingtianhong@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	"Yijing Wang" <wangyijing@...wei.com>,
	Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH 2/2] PCI: generic: add description of property "interrupt-skip-mask"

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@...wei.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