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dt/bindings: Add bindings for Layerscape external irqs 

This adds Device Tree binding documentation for the external interrupt
lines with configurable polarity present on some Layerscape SOCs.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20191107122115.6244-2-linux@rasmusvillemoes.dk
This commit is contained in:
Rasmus Villemoes 2019-11-07 13:21:14 +01:00 committed by Marc Zyngier
parent 96de80c14b
commit 87cd38dfd9
1 changed files with 49 additions and 0 deletions
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Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.txt Normal file
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* Freescale Layerscape external IRQs
Some Layerscape SOCs (LS1021A, LS1043A, LS1046A) support inverting
the polarity of certain external interrupt lines.
The device node must be a child of the node representing the
Supplemental Configuration Unit (SCFG).
Required properties:
- compatible: should be "fsl,<soc-name>-extirq", e.g. "fsl,ls1021a-extirq".
- #interrupt-cells: Must be 2. The first element is the index of the
external interrupt line. The second element is the trigger type.
- #address-cells: Must be 0.
- interrupt-controller: Identifies the node as an interrupt controller
- reg: Specifies the Interrupt Polarity Control Register (INTPCR) in
the SCFG.
- interrupt-map: Specifies the mapping from external interrupts to GIC
interrupts.
- interrupt-map-mask: Must be <0xffffffff 0>.
Example:
scfg: scfg@1570000 {
compatible = "fsl,ls1021a-scfg", "syscon";
reg = <0x0 0x1570000 0x0 0x10000>;
big-endian;
#address-cells = <1>;
#size-cells = <1>;
ranges = <0x0 0x0 0x1570000 0x10000>;
extirq: interrupt-controller@1ac {
compatible = "fsl,ls1021a-extirq";
#interrupt-cells = <2>;
#address-cells = <0>;
interrupt-controller;
reg = <0x1ac 4>;
interrupt-map =
<0 0 &gic GIC_SPI 163 IRQ_TYPE_LEVEL_HIGH>,
<1 0 &gic GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>,
<2 0 &gic GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>,
<3 0 &gic GIC_SPI 167 IRQ_TYPE_LEVEL_HIGH>,
<4 0 &gic GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>,
<5 0 &gic GIC_SPI 169 IRQ_TYPE_LEVEL_HIGH>;
interrupt-map-mask = <0xffffffff 0x0>;
};
};
interrupts-extended = <&gic GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
<&extirq 1 IRQ_TYPE_LEVEL_LOW>;