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irqchip: st: Add documentation for STi based syscfg IRQs

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Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lkml.kernel.org/r/1424272444-16230-4-git-send-email-lee.jones@linaro.org
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Lee Jones 2015-02-18 15:13:59 +00:00 committed by Jason Cooper
parent 070884845b
commit f1f5bc30f5
1 changed files with 35 additions and 0 deletions
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35
Documentation/devicetree/bindings/interrupt-controller/st,sti-irq-syscfg.txt Normal file
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STMicroelectronics STi System Configuration Controlled IRQs
-----------------------------------------------------------
On STi based systems; External, CTI (Core Sight), PMU (Performance Management),
and PL310 L2 Cache IRQs are controlled using System Configuration registers.
This driver is used to unmask them prior to use.
Required properties:
- compatible : Should be set to one of:
"st,stih415-irq-syscfg"
"st,stih416-irq-syscfg"
"st,stih407-irq-syscfg"
"st,stid127-irq-syscfg"
- st,syscfg : Phandle to Cortex-A9 IRQ system config registers
- st,irq-device : Array of IRQs to enable - should be 2 in length
- st,fiq-device : Array of FIQs to enable - should be 2 in length
Optional properties:
- st,invert-ext : External IRQs can be inverted at will. This property inverts
these IRQs using bitwise logic. A number of defines have been
provided for convenience:
ST_IRQ_SYSCFG_EXT_1_INV
ST_IRQ_SYSCFG_EXT_2_INV
ST_IRQ_SYSCFG_EXT_3_INV
Example:
irq-syscfg {
compatible = "st,stih416-irq-syscfg";
st,syscfg = <&syscfg_cpu>;
st,irq-device = <ST_IRQ_SYSCFG_PMU_0>,
<ST_IRQ_SYSCFG_PMU_1>;
st,fiq-device = <ST_IRQ_SYSCFG_DISABLED>,
<ST_IRQ_SYSCFG_DISABLED>;
st,invert-ext = <(ST_IRQ_SYSCFG_EXT_1_INV | ST_IRQ_SYSCFG_EXT_3_INV)>;
};