This patch add more description about aspeed adc and add vref property
for ast2600 to configure it reference voltage.
Signed-off-by: Billy Tsai <billy_tsai@xxxxxxxxxxxxxx>
---
.../bindings/iio/adc/aspeed,adc.yaml | 23 +++++++++++++++++--
1 file changed, 21 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/iio/adc/aspeed,adc.yaml b/Documentation/devicetree/bindings/iio/adc/aspeed,adc.yaml
index 7f534a933e92..67ff0b5c7ef2 100644
--- a/Documentation/devicetree/bindings/iio/adc/aspeed,adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/aspeed,adc.yaml
@@ -10,14 +10,26 @@ maintainers:
- Joel Stanley <joel@xxxxxxxxx>
description:
- This device is a 10-bit converter for 16 voltage channels. All inputs are
- single ended.
+ • 10-bits resolution for 16 voltage channels.
+ At ast2400/ast2500 the device has only one engine with 16 voltage channels.
+ At ast2600 the device split into two individual engine and each contains 8 voltage channels.
+ • Channel scanning can be non-continuous.
+ • Programmable ADC clock frequency.
+ • Programmable upper and lower bound for each channels.
+ • Interrupt when larger or less than bounds for each channels.
+ • Support hysteresis for each channels.
+ • Buildin a compensating method.
+ Additional feature at ast2600
+ • Internal or External reference voltage.
+ • Support 2 Internal reference voltage 1.2v or 2.5v.
+ • Integrate dividing circuit for battery sensing.
properties:
compatible:
enum:
- aspeed,ast2400-adc
- aspeed,ast2500-adc
+ - aspeed,ast2600-adc
reg:
maxItems: 1
@@ -33,6 +45,13 @@ properties:
"#io-channel-cells":
const: 1
+ vref:
+ minItems: 900
+ maxItems: 2700
+ default: 2500
+ description:
+ ADC Reference voltage in millivolts (only work at ast2600)
+
required:
- compatible
- reg
--
2.25.1
