>From d228a1a119e33aff91f481fb8ab301a027b5a4ac Mon Sep 17 00:00:00 2001
From: Adam Michaelis <adam.michaelis@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 25 Apr 2019 15:22:00 -0500
Subject: [PATCH 2/6] dt-bindings: iio: ad7949: Add adi,reference-select
Adding optional parameter to AD7949 to specify the source for the
reference voltage signal. Default value is maintaned with option '6' to
match previous version of driver.
Signed-off-by: Adam Michaelis <adam.michaelis@xxxxxxxxxxxxxxxxxxx>
---
Sorry about the re-sends - GMail inserted HTML on me and it bounced from vger.
---
.../devicetree/bindings/iio/adc/ad7949.txt | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/iio/adc/ad7949.txt
b/Documentation/devicetree/bindings/iio/adc/ad7949.txt
index c7f5057356b1..14ee9a2cb2a5 100644
--- a/Documentation/devicetree/bindings/iio/adc/ad7949.txt
+++ b/Documentation/devicetree/bindings/iio/adc/ad7949.txt
@@ -6,11 +6,29 @@ Required properties:
* "adi,ad7682"
* "adi,ad7689"
- reg: spi chip select number for the device
- - vref-supply: The regulator supply for ADC reference voltage
-Example:
+Optional properties:
+ - adi,reference-select: Select the reference voltage source to use
+ when converting the input voltages. Valid values are:
+ 0: Internal 2.5V reference; temperature sensor enabled
+ 1: Internal 4.096V reference; temperature sensor enabled
+ 2: External reference, temperature sensor enabled, no buffer
+ 3: External reference, temperature sensor enabled, buffer enabled
+ 6: External reference, temperature sensor disabled, no buffer
+ 7: External reference, temperature sensor disabled, buffer enabled
+ - vref-supply: The regulator supply for ADC reference voltage. Required
+ if external reference selected by 'adi,reference-select'.
+
+Examples:
adc@0 {
compatible = "adi,ad7949";
reg = <0>;
+ adi,reference-select = <2>;
vref-supply = <&vdd_supply>;
};
+
+adc@0 {
+ compatible = "adi,ad7949";
+ reg = <0>;
+ adi,reference-select = <0>;
+};
--
1.9.1
