[PATCH v5 3/3] dt-binding:Documents of the mbigen bindings

MaJun
2015-09-30T09:39:09Z

From: Ma Jun <majun258@huawei.com>

Add the mbigen msi interrupt controller bindings document.

This patch based on Mark Rutland's patch
https://lkml.org/lkml/2015/7/23/558

Signed-off-by: Ma Jun <majun258@huawei.com>
---
Documentation/devicetree/bindings/arm/mbigen.txt | 85 ++++++++++++++++++++++
1 files changed, 85 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/arm/mbigen.txt

diff --git a/Documentation/devicetree/bindings/arm/mbigen.txt b/Documentation/devicetree/bindings/arm/mbigen.txt
new file mode 100644
index 0000000..f5345ab
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/mbigen.txt
@@ -0,0 +1,85 @@
+Hisilicon mbigen device tree bindings.
+=======================================
+
+Mbigen means: message based interrupt generator.
+
+MBI is kind of msi interrupt only used on Non-PCI devices.
+
+To reduce the wired interrupt number connected to GIC,
+Hisilicon designed mbigen to collect and generate interrupt.
+
+
+Non-pci devices can connect to mbigen and generate the
+interrupt by writing ITS register.
+
+The mbigen chip and devices connect to mbigen have the following properties:
+
+Mbigen main node required properties:
+-------------------------------------------
+- compatible: Should be "hisilicon,mbigen-v2"
+- reg: Specifies the base physical address and size of the Mbigen
+ registers.
+
+Sub-nodes:
+---------------------------------------------
+Mbigen has one or more mbigen device nodes which represents the devices
+connected to this mbigen chip.
+
+These nodes must have the following properties:
+- compatible: Should be "hisilicon,mbigen-intc-v2"
+- interrupt controller: Identifies the node as an interrupt controller
+- msi-parent: This property has two cells.
+ The 1st cell specifies the ITS this device connected.
+ The 2nd cell specifies the device id.
+- nr-interrupts:Specifies the total number of interrupt this device has.
+- #interrupt-cells : Specifies the number of cells needed to encode an
+ interrupt source. The value is 2 now.
+
+ The 1st cell is global hardware pin number of the interrupt.
+ This value depends on the Soc design.
+ The 2nd the private index of the device. For a device with n interrupts,
+ this value is from 0 ~ n-1.
+
+Examples:
+
+ mbigen_dsa: interrupt-controller at c0080000 {
+ compatible = "hisilicon,mbigen-v2";
+ reg = <0xc0080000 0x10000>;
+
+ mbigen_device_gmac0 {
+ compatible = "hisilicon,mbigen-intc-v2";
+ interrupt-controller;
+ msi-parent = <&its 0x40b1c>;
+ nr-interrupts = <9>;
+ #interrupt-cells = <2>;
+ }
+
+ mbigen_device_02 {
+ compatible = "hisilicon,mbigen-intc-v2";
+ interrupt-controller;
+ msi-parent = <&its 0x40b1d>;
+ nr-interrupts = <3>;
+ #interrupt-cells = <2>;
+ }
+ };
+
+Device connect to mbigen required properties:
+----------------------------------------------------
+-interrupt-parent: Specifies the mbigen device node which device connected.
+-interrupts:specifies the interrupt source.
+ The 1st cell is global hardware pin number of the interrupt.
+ This value depends on the Soc design.
+ The 2nd the private index of the device. For a device with n interrupts,
+ this value is from 0 ~ n-1.
+
+Examples:
+ gmac0: ethernet at c2080000 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0 0xc2080000 0 0x20000>,
+ <0 0xc0000000 0 0x1000>;
+ interrupt-parent = <&mbigen_device_gmac0>;
+ interrupts = <656 0>,
+ <657 1>;
+ };
+
--
1.7.1