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-rw-r--r--dts/Bindings/iio/dac/ltc2632.txt14
1 files changed, 14 insertions, 0 deletions
diff --git a/dts/Bindings/iio/dac/ltc2632.txt b/dts/Bindings/iio/dac/ltc2632.txt
index eb911e5..e0d5fea 100644
--- a/dts/Bindings/iio/dac/ltc2632.txt
+++ b/dts/Bindings/iio/dac/ltc2632.txt
@@ -12,12 +12,26 @@ Required properties:
Property rules described in Documentation/devicetree/bindings/spi/spi-bus.txt
apply. In particular, "reg" and "spi-max-frequency" properties must be given.
+Optional properties:
+ - vref-supply: Phandle to the external reference voltage supply. This should
+ only be set if there is an external reference voltage connected to the VREF
+ pin. If the property is not set the internal reference is used.
+
Example:
+ vref: regulator-vref {
+ compatible = "regulator-fixed";
+ regulator-name = "vref-ltc2632";
+ regulator-min-microvolt = <1250000>;
+ regulator-max-microvolt = <1250000>;
+ regulator-always-on;
+ };
+
spi_master {
dac: ltc2632@0 {
compatible = "lltc,ltc2632-l12";
reg = <0>; /* CS0 */
spi-max-frequency = <1000000>;
+ vref-supply = <&vref>; /* optional */
};
};