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dt-bindings: gpio: max3191x: Document new driver
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>
authored by
Lukas Wunner
and committed by
Linus Walleij
c019c18d
1f63fab9
+59
+59
Documentation/devicetree/bindings/gpio/gpio-max3191x.txt
+59
Documentation/devicetree/bindings/gpio/gpio-max3191x.txt
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GPIO driver for Maxim MAX3191x industrial serializer
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Required properties:
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- compatible: Must be one of:
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"maxim,max31910"
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"maxim,max31911"
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"maxim,max31912"
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"maxim,max31913"
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"maxim,max31953"
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"maxim,max31963"
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- reg: Chip select number.
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- gpio-controller: Marks the device node as a GPIO controller.
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- #gpio-cells: Should be two. For consumer use see gpio.txt.
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Optional properties:
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- #daisy-chained-devices:
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Number of chips in the daisy-chain (default is 1).
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- maxim,modesel-gpios: GPIO pins to configure modesel of each chip.
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The number of GPIOs must equal "#daisy-chained-devices"
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(if each chip is driven by a separate pin) or 1
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(if all chips are wired to the same pin).
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- maxim,fault-gpios: GPIO pins to read fault of each chip.
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The number of GPIOs must equal "#daisy-chained-devices"
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or 1.
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- maxim,db0-gpios: GPIO pins to configure debounce of each chip.
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The number of GPIOs must equal "#daisy-chained-devices"
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or 1.
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- maxim,db1-gpios: GPIO pins to configure debounce of each chip.
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The number of GPIOs must equal "maxim,db0-gpios".
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- maxim,modesel-8bit: Boolean whether the modesel pin of the chips is
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pulled high (8-bit mode). Use this if the modesel pin
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is hardwired and consequently "maxim,modesel-gpios"
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cannot be specified. By default if neither this nor
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"maxim,modesel-gpios" is given, the driver assumes
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that modesel is pulled low (16-bit mode).
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- maxim,ignore-undervoltage:
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Boolean whether to ignore undervoltage alarms signaled
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by the "maxim,fault-gpios" or by the status byte
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(in 16-bit mode). Use this if the chips are powered
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through 5VOUT instead of VCC24V, in which case they
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will constantly signal undervoltage.
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For other required and optional properties of SPI slave nodes please refer to
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../spi/spi-bus.txt.
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Example:
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gpio@0 {
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compatible = "maxim,max31913";
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reg = <0>;
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gpio-controller;
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#gpio-cells = <2>;
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maxim,modesel-gpios = <&gpio2 23>;
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maxim,fault-gpios = <&gpio2 24 GPIO_ACTIVE_LOW>;
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maxim,db0-gpios = <&gpio2 25>;
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maxim,db1-gpios = <&gpio2 26>;
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spi-max-frequency = <25000000>;
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};