| Message ID | 20210723081621.29477-3-billy_tsai@aspeedtech.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add support for ast2600 ADC | expand |
Hi Jonathan,
Thanks for your review. I will fix them.
About the vref I reply inline.
On 2021/7/23, 10:52 PM, "Jonathan Cameron" <Jonathan.Cameron@Huawei.com> wrote:
On Fri, 23 Jul 2021 16:16:15 +0800
Billy Tsai <billy_tsai@aspeedtech.com> wrote:
> > + • 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 +45,18 @@ properties:
> > "#io-channel-cells":
> > const: 1
> >
> > + vref:
> > + minItems: 900
> > + maxItems: 2700
> > + default: 2500
> > + description:
> > + ADC Reference voltage in millivolts.
> I'm not clear from this description. Is this describing an externally
> connected voltage reference? If so it needs to be done as a regulator.
> If it's a classic high precision reference, the dts can just use
> a fixed regulator.
In the ast2600, the ADC supports two internal reference voltages of 1.2v or 2.5v,
as well as external voltages. When the user selects a voltage of 1.2v or 2.5v, my
driver will first select to use the internal voltage.
As you mention at patch #4, you suggest to use two property to handle this feature.
vref: indicate the regulator handler. Like other dt-bindings used.
aspeed,int_vref_mv: indicate the chosen of 1.2v or 2.5v
and use "model_data->vref_fixed" to exclude ast2400 and ast2500
Is it right?
Thanks
> > +
> > + battery-sensing:
> > + type: boolean
> > + description:
> > + Inform the driver that last channel will be used to sensor battery.
> This isn't (I think?) a standard dt binding, so it needs a manufacturer
> prefix.
> aspeed,battery-sensing
Best Regards,
Billy Tsai
diff --git a/Documentation/devicetree/bindings/iio/adc/aspeed,adc.yaml b/Documentation/devicetree/bindings/iio/adc/aspeed,adc.yaml index 23f3da1ffca3..a562a7fbc30c 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@jms.id.au> 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 +45,18 @@ properties: "#io-channel-cells": const: 1 + vref: + minItems: 900 + maxItems: 2700 + default: 2500 + description: + ADC Reference voltage in millivolts. + + battery-sensing: + type: boolean + description: + Inform the driver that last channel will be used to sensor battery. + required: - compatible - reg
This patch add more description about aspeed adc and add two property for ast2600: - vref: used to configure reference voltage. - battery-sensing: used to enable battery sensing mode for last channel. Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com> --- .../bindings/iio/adc/aspeed,adc.yaml | 28 +++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-)