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Documentation: dts: add bindings for Vybrid GPIO/PORT module

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The Vybrid SoC device tree (vf610.dtsi) used this bindings since
its initial commit in May 2013. However, a proper gpiolib driver
was missing so far. With the addition of the gpiolib driver,
the bindings proved to be useful and complete, hence a good time
to add the documentation.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Stefan Agner 2014-10-16 21:48:00 +02:00 committed by Linus Walleij
parent 7f2691a196
commit 580b9676e5
1 changed files with 55 additions and 0 deletions
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Documentation/devicetree/bindings/gpio/gpio-vf610.txt Normal file
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* Freescale VF610 PORT/GPIO module
The Freescale PORT/GPIO modules are two adjacent modules providing GPIO
functionality. Each pair serves 32 GPIOs. The VF610 has 5 instances of
each, and each PORT module has its own interrupt.
Required properties for GPIO node:
- compatible : Should be "fsl,<soc>-gpio", currently "fsl,vf610-gpio"
- reg : The first reg tuple represents the PORT module, the second tuple
the GPIO module.
- interrupts : Should be the port interrupt shared by all 32 pins.
- gpio-controller : Marks the device node as a gpio controller.
- #gpio-cells : Should be two. The first cell is the pin number and
the second cell is used to specify the gpio polarity:
0 = active high
1 = active low
- interrupt-controller: Marks the device node as an interrupt controller.
- #interrupt-cells : Should be 2. The first cell is the GPIO number.
The second cell bits[3:0] is used to specify 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.
Note: Each GPIO port should have an alias correctly numbered in "aliases"
node.
Examples:
aliases {
gpio0 = &gpio1;
gpio1 = &gpio2;
};
gpio1: gpio@40049000 {
compatible = "fsl,vf610-gpio";
reg = <0x40049000 0x1000 0x400ff000 0x40>;
interrupts = <0 107 IRQ_TYPE_LEVEL_HIGH>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
gpio-ranges = <&iomuxc 0 0 32>;
};
gpio2: gpio@4004a000 {
compatible = "fsl,vf610-gpio";
reg = <0x4004a000 0x1000 0x400ff040 0x40>;
interrupts = <0 108 IRQ_TYPE_LEVEL_HIGH>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
gpio-ranges = <&iomuxc 0 32 32>;
};