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rtc: isl1219: add device tree documentation 

The devicetree documentation for the ISL1219 device tree
binding is added with a short example. It is not a trivial
device, because it supports two interrupt sources.

Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
hifive-unleashed-5.1
Denis Osterland 2018-07-24 11:31:22 +00:00 committed by Alexandre Belloni
parent cfa30622c8
commit 6f7ea94acb
1 changed files with 29 additions and 0 deletions
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Documentation/devicetree/bindings/rtc/isil,isl1219.txt 100644
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Intersil ISL1219 I2C RTC/Alarm chip with event in
ISL1219 has additional pins EVIN and #EVDET for tamper detection.
Required properties supported by the device:
- "compatible": must be "isil,isl1219"
- "reg": I2C bus address of the device
Optional properties:
- "interrupt-names": list which may contains "irq" and "evdet"
- "interrupts": list of interrupts for "irq" and "evdet"
- "isil,ev-evienb": if present EV.EVIENB bit is set to the specified
value for proper operation.
Example isl1219 node with #IRQ pin connected to SoC gpio1 pin12
and #EVDET pin connected to SoC gpio2 pin 24:
isl1219: rtc@68 {
compatible = "isil,isl1219";
reg = <0x68>;
interrupt-names = "irq", "evdet";
interrupts-extended = <&gpio1 12 IRQ_TYPE_EDGE_FALLING>,
<&gpio2 24 IRQ_TYPE_EDGE_FALLING>;
isil,ev-evienb = <1>;
};