linux-kernel - Re: [v2 2/8] dt-bindings: iio: adc: Binding ast2600 adc.

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Date:   Mon, 26 Jul 2021 07:21:29 +0000
From:   Billy Tsai <billy_tsai@...eedtech.com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
CC:     "jic23@...nel.org" <jic23@...nel.org>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "joel@....id.au" <joel@....id.au>,
        "andrew@...id.au" <andrew@...id.au>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        BMC-SW <BMC-SW@...eedtech.com>
Subject: Re: [v2 2/8] dt-bindings: iio: adc: Binding ast2600 adc.

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@...wei.com> wrote:

    On Fri, 23 Jul 2021 16:16:15 +0800
    Billy Tsai <billy_tsai@...eedtech.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