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pca953x: add example how to use interrupt-controller and gpio-controller

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It is not completely obvious that these are required and
how to use them. So we provide a tested example.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
H. Nikolaus Schaller 2018-04-28 18:31:37 +02:00 committed by Linus Walleij
parent adc07ab745
commit 6906a4f9d1
1 changed files with 33 additions and 0 deletions
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33
Documentation/devicetree/bindings/gpio/gpio-pca953x.txt
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@ -31,6 +31,10 @@ Required properties:
ti,tca9554
onnn,pca9654
exar,xra1202
- gpio-controller: if used as gpio expander.
- #gpio-cells: if used as gpio expander.
- interrupt-controller: if to be used as interrupt expander.
- #interrupt-cells: if to be used as interrupt expander.
Optional properties:
- reset-gpios: GPIO specification for the RESET input. This is an
@ -48,3 +52,32 @@ Example:
interrupt-parent = <&gpio3>;
interrupts = <23 IRQ_TYPE_LEVEL_LOW>;
};
Example with Interrupts:
gpio99: gpio@22 {
compatible = "nxp,pcal6524";
reg = <0x22>;
interrupt-parent = <&gpio6>;
interrupts = <1 IRQ_TYPE_EDGE_FALLING>; /* gpio6_161 */
interrupt-controller;
#interrupt-cells = <2>;
vcc-supply = <&vdds_1v8_main>;
gpio-controller;
#gpio-cells = <2>;
gpio-line-names =
"hdmi-ct-hpd", "hdmi.ls-oe", "p02", "p03", "vibra", "fault2", "p06", "p07",
"en-usb", "en-host1", "en-host2", "chg-int", "p14", "p15", "mic-int", "en-modem",
"shdn-hs-amp", "chg-status+red", "green", "blue", "en-esata", "fault1", "p26", "p27";
};
ts3a227@3b {
compatible = "ti,ts3a227e";
reg = <0x3b>;
interrupt-parent = <&gpio99>;
interrupts = <14 IRQ_TYPE_EDGE_RISING>;
ti,micbias = <0>; /* 2.1V */
};