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Subject[PATCH v6 2/2] dt/bindings: Add bindings for Layerscape external irqs
Date
From: Rasmus Villemoes <rasmus.villemoes@prevas.dk>

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

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
---

Changes since v5:

- Add #address-cells and #size-cells to parent
- Mention LS2088A and the ISC unit

.../interrupt-controller/fsl,ls-extirq.txt | 47 +++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.txt

diff --git a/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.txt b/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.txt
new file mode 100644
index 000000000000..7b53f9cc8019
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.txt
@@ -0,0 +1,47 @@
+* Freescale Layerscape external IRQs
+
+Some Layerscape SOCs (LS1021A, LS1043A, LS1046A, LS2088A) 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) or the Interrupt Sampling
+Control (ISC) Unit.
+
+Required properties:
+- compatible: should be "fsl,<soc-name>-extirq", e.g. "fsl,ls1021a-extirq".
+- interrupt-controller: Identifies the node as an interrupt controller
+- #interrupt-cells: Must be 2. The first element is the index of the
+ external interrupt line. The second element is the trigger type.
+- interrupt-parent: phandle of GIC.
+- reg: Specifies the Interrupt Polarity Control Register (INTPCR) in the SCFG.
+- fsl,extirq-map: Specifies the mapping to interrupt numbers in the parent
+ interrupt controller. Interrupts are mapped one-to-one to parent
+ interrupts.
+
+Optional properties:
+- fsl,bit-reverse: This boolean property should be set on the LS1021A
+ if the SCFGREVCR register has been set to all-ones (which is usually
+ the case), meaning that all reads and writes of SCFG registers are
+ implicitly bit-reversed. Other compatible platforms do not have such
+ a register.
+
+Example:
+ scfg: scfg@1570000 {
+ compatible = "fsl,ls1021a-scfg", "syscon";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ ...
+ extirq: interrupt-controller {
+ compatible = "fsl,ls1021a-extirq";
+ #interrupt-cells = <2>;
+ interrupt-controller;
+ interrupt-parent = <&gic>;
+ reg = <0x1ac>;
+ fsl,extirq-map = <163 164 165 167 168 169>;
+ fsl,bit-reverse;
+ };
+ };
+
+
+ interrupts-extended = <&gic GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
+ <&extirq 1 IRQ_TYPE_LEVEL_LOW>;
--
2.20.1
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