mirror of
https://github.com/torvalds/linux.git
synced 2024-12-30 23:02:08 +00:00
c019c18da1
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>
60 lines
2.1 KiB
Plaintext
60 lines
2.1 KiB
Plaintext
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>;
|
|
};
|