Add device tree bindings for Maxim MAX3191x industrial serializer.
Cc: Mathias Duckeck <m.duckeck@xxxxxxxxx>
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
---
.../devicetree/bindings/gpio/gpio-max3191x.txt | 37 ++++++++++++++++++++++
1 file changed, 37 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-max3191x.txt
diff --git a/Documentation/devicetree/bindings/gpio/gpio-max3191x.txt b/Documentation/devicetree/bindings/gpio/gpio-max3191x.txt
new file mode 100644
index 000000000000..18182ecaa199
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-max3191x.txt
@@ -0,0 +1,37 @@
+GPIO driver for Maxim MAX3191x industrial serializer
+
+Required properties:
+ - compatible: "maxim,max31910", "maxim,max31911", "maxim,max31912",
+ "maxim,max31913", "maxim,max31953", "maxim,max31963"
+ - gpio-controller: Marks the device node as a GPIO controller.
+ - #gpio-cells: Should be two. For consumer use see gpio.txt.
+
+Optional properties:
+ - maxim,nchips: Number of chips in the daisy-chain (default is 1).
+ - modesel-gpios: GPIO pins to configure modesel of each chip.
+ The number of GPIOs must be equal to "maxim,nchips".
+ - fault-gpios: GPIO pins to read undervoltage fault of each chip.
+ - db0-gpios: GPIO pins to configure debounce of each chip.
+ - db1-gpios: GPIO pins to configure debounce of each chip.
+ - maxim,modesel: Mode to use if hardwired (and thus not selectable
+ through GPIOs): 0 for 16-bit mode, 1 for 8-bit mode.
+ - maxim,no-vcc24v: Boolean, whether the chips are powered through 5VOUT
+ instead of VCC24V.
+
+For other required and optional properties of SPI slave nodes please refer to
+../spi/spi-bus.txt.
+
+Example:
+ gpio@0 {
+ compatible = "maxim,max31913";
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ modesel-gpios = <&gpio2 23>;
+ fault-gpios = <&gpio2 24 GPIO_ACTIVE_LOW>;
+ db0-gpios = <&gpio2 25>;
+ db1-gpios = <&gpio2 26>;
+
+ reg = <0>;
+ spi-max-frequency = <25000000>;
+ };
--
2.11.0
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