Add device tree bindings for Maxim MAX3191x industrial serializer.
Cc: Mathias Duckeck <m.duckeck@xxxxxxxxx>
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
---
Changes v1 -> v2:
- Add vendor prefix to GPIO identifiers, use boolean instead of
integer to select mode, rename boolean to ignore undervoltage
alarms, separate compatible strings with newlines. (Rob Herring)
.../devicetree/bindings/gpio/gpio-max3191x.txt | 59 ++++++++++++++++++++++
1 file changed, 59 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..b3a6444b8f45
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-max3191x.txt
@@ -0,0 +1,59 @@
+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>;
+ };
--
2.11.0
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