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

From: Ardelean, Alexandru
Date: Thu Nov 14 2019 - 09:02:11 EST

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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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