On Fri, Aug 30, 2019 at 12:32:20PM +0800, Jiaxun Yang wrote: > Document Loongson-3 I/O Interrupt controller. > > Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> > --- > .../loongson,ls3-iointc.yaml | 75 +++++++++++++++++++ > 1 file changed, 75 insertions(+) > create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,ls3-iointc.yaml > > diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,ls3-iointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,ls3-iointc.yaml > new file mode 100644 > index 000000000000..9aee10abd5cd > --- /dev/null > +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,ls3-iointc.yaml > @@ -0,0 +1,75 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: "http://devicetree.org/schemas/interrupt-controller/loongson,ls3-iointc.yaml#"; > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"; > + > +title: Loongson-3 I/O Interrupt Controller > + > +maintainers: > + - Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> > + > +description: | > + This interrupt controller is found in the Loongson-3 family of chips as the primary > + package interrupt source which can route interrupt to interrupt line of cores. > + > +properties: > + compatible: > + const: loongson,ls3-iointc > + > + reg: > + maxItems: 1 > + > + Extra blank line. > + interrupt-controller: true > + > + "#interrupt-cells": > + description: | > + Specifies the number of cells needed to encode an interrupt source. > + Must be 2 or 4. > + If the system requires describing interrupt line & core mapping, than > + it must be 4. > + > + The 1st cell is the hardware interrupt number. > + > + The 2nd cell is the flags, encoded as follows: > + bits[3:0] trigger type and level flags. > + 1 = low-to-high edge triggered > + 2 = high-to-low edge triggered > + 4 = active high level-sensitive > + 8 = active low level-sensitive. > + > + The 3rd is the parent interrupt line that interrupt would map to. > + As the CPU preserved 4 interrupt lines for I/O, in theory any of the iointc > + interrupt can be chained to any interrupt lines on a core. But currently > + we can only map all the interrupt to a single parent, so this cell must be > + set uniformly for all the child interrupts corresponding to the parent > + interrupt. > + > + The 4th is the parent core that interrupt would map to. The interrupt > + contoller can map any of the interrupt to the specified core on a package. > + This cell determined the core. It must be the bootcore. > + > + If the 3rd, 4th cell is not set, it will default to the 0# interrupt line > + and bootcore. > + > + enum: [ 2, 4 ] > + > +required: > + - compatible > + - reg > + - interrupts Missing from the property list and needs to define how many. > + - interrupt-controller > + - '#interrupt-cells' > + > + > +examples: > + - | > + iointc: interrupt-controller@3ff01400 { > + compatible = "loongson,ls3-io-intc"; > + reg = <0x3ff01400 0x60>; > + interrupts = <2>; > + interrupt-controller; > + #interrupt-cells = <4>; > + }; > +... > -- > 2.22.0 >
