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author | Nicolas Ferre <nicolas.ferre@atmel.com> | 2011-11-22 22:26:09 +0100 |
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committer | Nicolas Ferre <nicolas.ferre@atmel.com> | 2012-03-01 13:29:00 +0100 |
commit | e261501d05bd2df244d31e0866b1e81776766ecf (patch) | |
tree | c0699ee7b1f2c8a58ff25c5dd2a0ab211a5b423d /Documentation/devicetree | |
parent | 89d4a1753b6632327f18d6c8e0842b366b736621 (diff) | |
download | op-kernel-dev-e261501d05bd2df244d31e0866b1e81776766ecf.zip op-kernel-dev-e261501d05bd2df244d31e0866b1e81776766ecf.tar.gz |
ARM: at91/aic: add irq domain and device tree support
Add an irqdomain for the AIC interrupt controller.
The device tree support is mapping the registers and
is using the irq_domain_add_legacy() to manage hwirq
translation.
The documentation is describing the meaning of the
two cells required for using this "interrupt-controller"
in a device tree node.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r-- | Documentation/devicetree/bindings/arm/atmel-aic.txt | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/arm/atmel-aic.txt b/Documentation/devicetree/bindings/arm/atmel-aic.txt new file mode 100644 index 0000000..aabca4f --- /dev/null +++ b/Documentation/devicetree/bindings/arm/atmel-aic.txt @@ -0,0 +1,38 @@ +* Advanced Interrupt Controller (AIC) + +Required properties: +- compatible: Should be "atmel,<chip>-aic" +- interrupt-controller: Identifies the node as an interrupt controller. +- interrupt-parent: For single AIC system, it is an empty property. +- #interrupt-cells: The number of cells to define the interrupts. It sould be 2. + The first cell is the IRQ number (aka "Peripheral IDentifier" on datasheet). + The second cell is used to specify flags: + 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. + Valid combinations are 1, 2, 3, 4, 8. + Default flag for internal sources should be set to 4 (active high). +- reg: Should contain AIC registers location and length + +Examples: + /* + * AIC + */ + aic: interrupt-controller@fffff000 { + compatible = "atmel,at91rm9200-aic"; + interrupt-controller; + interrupt-parent; + #interrupt-cells = <2>; + reg = <0xfffff000 0x200>; + }; + + /* + * An interrupt generating device that is wired to an AIC. + */ + dma: dma-controller@ffffec00 { + compatible = "atmel,at91sam9g45-dma"; + reg = <0xffffec00 0x200>; + interrupts = <21 4>; + }; |