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dt-bindings: gpio: max3191x: Document new driver

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Add device tree bindings for Maxim MAX3191x industrial serializer.

Cc: Mathias Duckeck <m.duckeck@kunbus.de>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Lukas Wunner 2017-10-12 12:40:10 +02:00 committed by Linus Walleij
parent 1f63fab955
commit c019c18da1
1 changed files with 59 additions and 0 deletions
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Documentation/devicetree/bindings/gpio/gpio-max3191x.txt Normal file
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GPIO driver for Maxim MAX3191x industrial serializer
Required properties:
- compatible: Must be one of:
"maxim,max31910"
"maxim,max31911"
"maxim,max31912"
"maxim,max31913"
"maxim,max31953"
"maxim,max31963"
- reg: Chip select number.
- gpio-controller: Marks the device node as a GPIO controller.
- #gpio-cells: Should be two. For consumer use see gpio.txt.
Optional properties:
- #daisy-chained-devices:
Number of chips in the daisy-chain (default is 1).
- maxim,modesel-gpios: GPIO pins to configure modesel of each chip.
The number of GPIOs must equal "#daisy-chained-devices"
(if each chip is driven by a separate pin) or 1
(if all chips are wired to the same pin).
- maxim,fault-gpios: GPIO pins to read fault of each chip.
The number of GPIOs must equal "#daisy-chained-devices"
or 1.
- maxim,db0-gpios: GPIO pins to configure debounce of each chip.
The number of GPIOs must equal "#daisy-chained-devices"
or 1.
- maxim,db1-gpios: GPIO pins to configure debounce of each chip.
The number of GPIOs must equal "maxim,db0-gpios".
- maxim,modesel-8bit: Boolean whether the modesel pin of the chips is
pulled high (8-bit mode). Use this if the modesel pin
is hardwired and consequently "maxim,modesel-gpios"
cannot be specified. By default if neither this nor
"maxim,modesel-gpios" is given, the driver assumes
that modesel is pulled low (16-bit mode).
- maxim,ignore-undervoltage:
Boolean whether to ignore undervoltage alarms signaled
by the "maxim,fault-gpios" or by the status byte
(in 16-bit mode). Use this if the chips are powered
through 5VOUT instead of VCC24V, in which case they
will constantly signal undervoltage.
For other required and optional properties of SPI slave nodes please refer to
../spi/spi-bus.txt.
Example:
gpio@0 {
compatible = "maxim,max31913";
reg = <0>;
gpio-controller;
#gpio-cells = <2>;
maxim,modesel-gpios = <&gpio2 23>;
maxim,fault-gpios = <&gpio2 24 GPIO_ACTIVE_LOW>;
maxim,db0-gpios = <&gpio2 25>;
maxim,db1-gpios = <&gpio2 26>;
spi-max-frequency = <25000000>;
};