Re: [PATCH 1/3] dt-bindings: iio: adc: add support for AD5940

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On Thu, 2019-11-14 at 21:32 +0800, Song Qiang wrote:
> [External]
> 
> 
> 
> On 11/11/19 12:26 AM, Jonathan Cameron wrote:
> > On Fri,  8 Nov 2019 21:09:44 +0800
> > Song Qiang <songqiang1304521@xxxxxxxxx> wrote:
> > 
> > > Add yaml devicetree description file and a header file for
> > > helping configure positive and negtive input of AD5940.
> > > 
> > > Signed-off-by: Song Qiang <songqiang1304521@xxxxxxxxx>
> > Ouch. This is a very complex device, so I'm guessing this is the tip
> > of the iceberg when it comes to the eventual binding.
> > For reference of others this has a similarly complex DAC and
> > TIA + some excitation voltage generators (DDS).
> > 
> > Anyhow, a few comments inline but I'll definitely be looking for
> > a dt maintainer input on this one.
> > 
> > Thanks,
> > 
> > Jonathan
> > 
> 
> Thanks, this is the first part support of the driver.
> 
> > > ---
> > >  .../bindings/iio/adc/adi,ad5940.yaml          | 240
> > > ++++++++++++++++++
> > >  include/dt-bindings/iio/adc/adi,ad5940.h      |  52 ++++
> > >  2 files changed, 292 insertions(+)
> > >  create mode 100644
> > > Documentation/devicetree/bindings/iio/adc/adi,ad5940.yaml
> > >  create mode 100644 include/dt-bindings/iio/adc/adi,ad5940.h
> > > 
> > > diff --git
> > > a/Documentation/devicetree/bindings/iio/adc/adi,ad5940.yaml
> > > b/Documentation/devicetree/bindings/iio/adc/adi,ad5940.yaml
> > > new file mode 100644
> > > index 000000000000..f7f034fdd8ec
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad5940.yaml
> > > @@ -0,0 +1,240 @@
> > > +# SPDX-License-Identifier: GPL-2.0
> > For new bindings, preference is to include a dual license
> > (GPL-2.0-only OR BSD-2-Clause)
> > 
> > If Analog is fine doing this that would be great.

For the license:

Acked-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>

> > 
> 
> I'll consult my mentor about this.
> 
> > > +# Copyright 2019 Analog Devices Inc.
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/bindings/iio/adc/adi,ad5940.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Analog Devices AD5940 Device Tree Bindings
> > > +
> > > +maintainers:
> > > +  - Song Qiang <songqiang1304521@xxxxxxxxx>
> > > +
> > > +description: |
> > > +  Analog Devices AD5940 High Precision, Impedance, and
> > > Electrochemical Front End.
> > > +    
> > > https://www.analog.com/media/en/technical-documentation/data-sheets/AD5940.pdf
> > > +
> > > +properties:
> > > +  compatible:
> > > +    enum:
> > > +      - adi,ad5940
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  vref-supply:
> > > +    description:
> > > +      The regulator to be used to supply the reference voltage.
> > > +    maxItems: 1
> > 
> > It's worth taking a look at similar patch reviews to pick up on things
> > that are common issues.  Rob has pointed out a few times recently that
> > vref-supply can only ever have one item, so no need for maxItems.
> > 
> 
> That's right, thanks.
> 
> > > +
> > > +  adi,interrupt-io:
> > > +    description:
> > > +      Output GPIO index of interrupt controller of AD5940.
> > > +    maxItems: 1
> > 
> > I'm fairly sure an enum can only have one entry so don't think this is
> > needed.
> > 
> > > +    allOf:
> > > +      - $ref: /schemas/types.yaml#/definitions/uint32
> > > +      - enum: [0, 3, 6, 7]
> > > +
> > > +  '#address-cells':
> > > +    const: 1
> > > +
> > > +  '#size-cells':
> > > +    const: 0
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +  - interrupts
> > > +  - adi,interrupt-io
> > > +
> > > +patternProperties:
> > > +  # 'channel@0-255'
> > 
> > Really?  That is a lot of channels.  Superficially it looks like a much
> > smaller number of possibilities from the datasheet.
> > 
> 
> This device has some positive inputs and some negative inputs. A channel
> here is a combination of one positive input and one negative input.
> These channels I listed in examples are only suggested combinations in
> the datasheet, while other combinations are all possible. So I was
> thinking to not limit the total count of channels here. I failed to find
> examples of doing this kind of stuff in the tree.
> 
> yours,
> Song Qiang
> 
> > > +  "^channel@([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])$":
> > > +    type: object
> > > +    description: |
> > > +      Represents the external channels which are connected to the
> > > ADC.
> > > +      See Documentation/devicetree/bindings/iio/adc/adc.txt.
> > > +    properties:
> > > +      reg:
> > > +        description:
> > > +          Index of this channel, must be starting from 0.
> > > +        maxItems: 1
> > > +
> > > +      diff-channels:
> > > +        description:
> > > +          Positive input and negtive input of the ADC buffer of this
> > > channel.
> > > +          Input candidates are defined in include/dt-
> > > bindings/iio/adc/adi,ad5940.h.
> > > +        minItems: 2
> > > +        maxItems: 2
> > > +        items:
> > > +          - description: Positive input channel
> > > +          - enum:
> > > +            - AD5940_ADC_INPUTP_EXCITATION
> > > +            - AD5940_ADC_INPUTP_FLOATING
> > > +            - AD5940_ADC_INPUTP_HSTIA
> > > +            - AD5940_ADC_INPUTP_LPTIA_LP
> > > +            - AD5940_ADC_INPUTP_AIN0
> > > +            - AD5940_ADC_INPUTP_AIN1
> > > +            - AD5940_ADC_INPUTP_AIN2
> > > +            - AD5940_ADC_INPUTP_AIN3
> > > +            - AD5940_ADC_INPUTP_AVDD_2
> > > +            - AD5940_ADC_INPUTP_DVDD_2
> > > +            - AD5940_ADC_INPUTP_AVDD_REG_2
> > > +            - AD5940_ADC_INPUTP_TEMP
> > > +            - AD5940_ADC_INPUTP_VBIAS_CAP
> > > +            - AD5940_ADC_INPUTP_DE0
> > > +            - AD5940_ADC_INPUTP_SE0
> > > +            - AD5940_ADC_INPUTP_VREF_2V5_2
> > > +            - AD5940_ADC_INPUTP_VREF_1V82
> > > +            - AD5940_ADC_INPUTP_P_TEMP_N
> > > +            - AD5940_ADC_INPUTP_AIN4
> > > +            - AD5940_ADC_INPUTP_AIN6
> > > +            - AD5940_ADC_INPUTP_VZERO
> > > +            - AD5940_ADC_INPUTP_VBIAS0
> > > +            - AD5940_ADC_INPUTP_VCE0
> > > +            - AD5940_ADC_INPUTP_VRE0
> > > +            - AD5940_ADC_INPUTP_VCE0_2
> > > +            - AD5940_ADC_INPUTP_LPTIA
> > > +            - AD5940_ADC_INPUTP_AGND_REF
> > > +
> > > +          - description: Negtive input channel
> > > +          - enum:
> > > +              # Negtive input candidates
> > > +              - AD5940_ADC_INPUTN_FLOATING
> > > +              - AD5940_ADC_INPUTN_HSTIA
> > > +              - AD5940_ADC_INPUTN_LPTIA
> > > +              - AD5940_ADC_INPUTN_AIN0
> > > +              - AD5940_ADC_INPUTN_AIN1
> > > +              - AD5940_ADC_INPUTN_AIN2
> > > +              - AD5940_ADC_INPUTN_AIN3
> > > +              - AD5940_ADC_INPUTN_VBIAS_CA8
> > > +              - AD5940_ADC_INPUTN_TEMP_N
> > > +              - AD5940_ADC_INPUTN_AIN4
> > > +              - AD5940_ADC_INPUTN_AIN6
> > > +              - AD5940_ADC_INPUTN_VZERO
> > > +              - AD5940_ADC_INPUTN_VBIAS0
> > > +              - AD5940_ADC_INPUTN_EXCITATION
> > > +
> > > +      channel-name:
> > > +        description:
> > > +          Any string format name you would like to assign to this
> > > channel.
> > > +        maxItems: 1
> > > +
> > > +    required:
> > > +      - reg
> > > +      - diff-channels
> > > +      - channel-name
> > > +
> > > +examples:
> > > +  - |
> > > +    ad5940: ad5940@0 {
> > > +      compatible = "adi,ad5940";
> > > +      reg = <0>;
> > > +      spi-max-frequency = <16000000>;
> > > +      vref-supply = <&adc_vref>;
> > > +      interrupt-parent = <&gpio>;
> > > +      interrupts = <24 2>;
> > > +
> > > +      adi,interrupt-io = <0>;
> > > +
> > > +      #address-cells = <1>;
> > > +      #size-cells = <0>;
> > > +
> > > +      channel@0 {
> > > +        reg = <0>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_VCE0
> > > +                         AD5940_ADC_INPUTN_VBIAS0>;
> > > +        channel-name = "Vce-Vbias";
> > > +      };
> > > +
> > > +      channel@1 {
> > > +        reg = <1>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_VRE0
> > > +                         AD5940_ADC_INPUTN_VBIAS0>;
> > > +        channel-name = "Vre-Vbias";
> > > +      };
> > > +
> > > +      channel@2 {
> > > +        reg = <2>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_SE0
> > > +                         AD5940_ADC_INPUTN_VBIAS0>;
> > > +        channel-name = "Vse-Vbias";
> > > +      };
> > > +
> > > +      channel@3 {
> > > +        reg = <3>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_DE0
> > > +                         AD5940_ADC_INPUTN_VBIAS0>;
> > > +        channel-name = "Vde-Vbias";
> > > +      };
> > > +
> > > +      channel@4 {
> > > +        reg = <4>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_AIN0
> > > +                         AD5940_ADC_INPUTN_VBIAS0>;
> > > +        channel-name = "ain0-Vbias";
> > > +      };
> > > +
> > > +      channel@5 {
> > > +        reg = <5>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_AIN1
> > > +                         AD5940_ADC_INPUTN_VBIAS0>;
> > > +        channel-name = "ain1-Vbias";
> > > +      };
> > > +
> > > +      channel@6 {
> > > +        reg = <6>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_AIN2
> > > +                         AD5940_ADC_INPUTN_VBIAS0>;
> > > +        channel-name = "ain2-Vbias";
> > > +      };
> > > +
> > > +      channel@7 {
> > > +        reg = <7>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_AIN3
> > > +                         AD5940_ADC_INPUTN_VBIAS0>;
> > > +        channel-name = "ain3-Vbias";
> > > +      };
> > > +
> > > +      channel@8 {
> > > +        reg = <8>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_AIN4
> > > +                         AD5940_ADC_INPUTN_VBIAS0>;
> > > +        channel-name = "ain4-Vbias";
> > > +      };
> > > +
> > > +      channel@9 {
> > > +        reg = <9>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_AIN6
> > > +                         AD5940_ADC_INPUTN_VBIAS0>;
> > > +        channel-name = "ain6-Vbias";
> > > +      };
> > > +
> > > +      channel@10 {
> > > +        reg = <10>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_LPTIA_LP
> > > +                         AD5940_ADC_INPUTN_LPTIA>;
> > > +        channel-name = "Low power TIA DC";
> > > +      };
> > > +
> > > +      channel@11 {
> > > +        reg = <11>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_LPTIA
> > > +                         AD5940_ADC_INPUTN_LPTIA>;
> > > +        channel-name = "Low power TIA AC";
> > > +      };
> > > +
> > > +      channel@12 {
> > > +        reg = <12>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_HSTIA
> > > +                         AD5940_ADC_INPUTN_HSTIA>;
> > > +        channel-name = "High Speed TIA";
> > > +      };
> > > +
> > > +      channel@13 {
> > > +        reg = <13>;
> > > +        diff-channels = <AD5940_ADC_INPUTP_TEMP
> > > +                         AD5940_ADC_INPUTN_VBIAS0>;
> > > +        channel-name = "Temperature";
> > > +      };
> > > +    };
> > > diff --git a/include/dt-bindings/iio/adc/adi,ad5940.h b/include/dt-
> > > bindings/iio/adc/adi,ad5940.h
> > > new file mode 100644
> > > index 000000000000..c17826f2f654
> > > --- /dev/null
> > > +++ b/include/dt-bindings/iio/adc/adi,ad5940.h
> > > @@ -0,0 +1,52 @@
> > > +/* SPDX-License-Identifier: GPL-2.0 */
> > > +/*
> > > + * This header provides constants for configuring the AD5940 AFE
> > > + */
> > > +
> > > +#ifndef _DT_BINDINGS_IIO_ADC_AD5940_H
> > > +#define _DT_BINDINGS_IIO_ADC_AD5940_H
> > > +
> > > +#define AD5940_ADC_INPUTN_FLOATING	0
> > > +#define AD5940_ADC_INPUTN_HSTIA		1
> > > +#define AD5940_ADC_INPUTN_LPTIA		2
> > > +#define AD5940_ADC_INPUTN_AIN0		4
> > > +#define AD5940_ADC_INPUTN_AIN1		5
> > > +#define AD5940_ADC_INPUTN_AIN2		6
> > > +#define AD5940_ADC_INPUTN_AIN3		7
> > > +#define AD5940_ADC_INPUTN_VBIAS_CA8	10
> > > +#define AD5940_ADC_INPUTN_TEMP_N	11
> > > +#define AD5940_ADC_INPUTN_AIN4		12
> > > +#define AD5940_ADC_INPUTN_AIN6		14
> > > +#define AD5940_ADC_INPUTN_VZERO		16
> > > +#define AD5940_ADC_INPUTN_VBIAS0	17
> > > +#define AD5940_ADC_INPUTN_EXCITATION	20
> > > +
> > > +#define AD5940_ADC_INPUTP_FLOATING	0
> > > +#define AD5940_ADC_INPUTP_HSTIA		1
> > > +#define AD5940_ADC_INPUTP_LPTIA_LP	2
> > > +#define AD5940_ADC_INPUTP_AIN0		4
> > > +#define AD5940_ADC_INPUTP_AIN1		5
> > > +#define AD5940_ADC_INPUTP_AIN2		6
> > > +#define AD5940_ADC_INPUTP_AIN3		7
> > > +#define AD5940_ADC_INPUTP_AVDD_2	8
> > > +#define AD5940_ADC_INPUTP_DVDD_2	9
> > > +#define AD5940_ADC_INPUTP_AVDD_REG_2	10
> > > +#define AD5940_ADC_INPUTP_TEMP		11
> > > +#define AD5940_ADC_INPUTP_VBIAS_CAP	12
> > > +#define AD5940_ADC_INPUTP_DE0		13
> > > +#define AD5940_ADC_INPUTP_SE0		14
> > > +#define AD5940_ADC_INPUTP_VREF_2V5_2	16
> > > +#define AD5940_ADC_INPUTP_VREF_1V82	18
> > > +#define AD5940_ADC_INPUTP_P_TEMP_N	19
> > > +#define AD5940_ADC_INPUTP_AIN4		20
> > > +#define AD5940_ADC_INPUTP_AIN6		22
> > > +#define AD5940_ADC_INPUTP_VZERO		23
> > > +#define AD5940_ADC_INPUTP_VBIAS0	24
> > > +#define AD5940_ADC_INPUTP_VCE0		25
> > > +#define AD5940_ADC_INPUTP_VRE0		26
> > > +#define AD5940_ADC_INPUTP_VCE0_2	31
> > > +#define AD5940_ADC_INPUTP_LPTIA		33
> > > +#define AD5940_ADC_INPUTP_AGND_REF	35
> > > +#define AD5940_ADC_INPUTP_EXCITATION	36
> > > +
> > > +#endif /* _DT_BINDINGS_IIO_ADC_AD5940 */




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