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Date:   Sun, 31 May 2020 11:44:45 +0100
From:   Jonathan Cameron <jic23@...23.retrosnub.co.uk>
To:     Jishnu Prakash <jprakash@...eaurora.org>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        mka@...omium.org, linus.walleij@...aro.org,
        Jonathan.Cameron@...wei.com, andy.shevchenko@...il.com,
        amit.kucheria@...durent.com, smohanad@...eaurora.org,
        kgunda@...eaurora.org, aghayal@...eaurora.org,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Amit Kucheria <amit.kucheria@...aro.org>,
        linux-iio@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH V6 1/7] iio: adc: Convert the QCOM SPMI ADC bindings to
 .yaml format

On Sun, 31 May 2020 11:36:12 +0100
Jonathan Cameron <jic23@...nel.org> wrote:

> On Thu, 28 May 2020 22:24:23 +0530
> Jishnu Prakash <jprakash@...eaurora.org> wrote:
> 
> > Convert the adc bindings from .txt to .yaml format.
> > 
> > Signed-off-by: Jishnu Prakash <jprakash@...eaurora.org>
> > Reviewed-by: Amit Kucheria <amit.kucheria@...aro.org>
> > Reviewed-by: Rob Herring <robh@...nel.org>
> > Acked-by: Linus Walleij <linus.walleij@...aro.org>  
> 
> Jishnu, Patch is fine, but I'd like to have seen a cover
> letter and clear statement of changes from v5.
> 

Applied to the togreg branch of iio.git and pushed out as
testing. Note we've missed the merge window now for IIO so this
will be in the following cycle.

Thanks,

J
> Thanks,
> 
> Jonathan
> 
> > ---
> >  .../devicetree/bindings/iio/adc/qcom,spmi-vadc.txt | 173 --------------
> >  .../bindings/iio/adc/qcom,spmi-vadc.yaml           | 252 +++++++++++++++++++++
> >  2 files changed, 252 insertions(+), 173 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt
> >  create mode 100644 Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt
> > deleted file mode 100644
> > index c878768..0000000
> > --- a/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.txt
> > +++ /dev/null
> > @@ -1,173 +0,0 @@
> > -Qualcomm's SPMI PMIC ADC
> > -
> > -- SPMI PMIC voltage ADC (VADC) provides interface to clients to read
> > -  voltage. The VADC is a 15-bit sigma-delta ADC.
> > -- SPMI PMIC5 voltage ADC (ADC) provides interface to clients to read
> > -  voltage. The VADC is a 16-bit sigma-delta ADC.
> > -
> > -VADC node:
> > -
> > -- compatible:
> > -    Usage: required
> > -    Value type: <string>
> > -    Definition: Should contain "qcom,spmi-vadc".
> > -                Should contain "qcom,spmi-adc5" for PMIC5 ADC driver.
> > -                Should contain "qcom,spmi-adc-rev2" for PMIC rev2 ADC driver.
> > -                Should contain "qcom,pms405-adc" for PMS405 PMIC
> > -
> > -- reg:
> > -    Usage: required
> > -    Value type: <prop-encoded-array>
> > -    Definition: VADC base address in the SPMI PMIC register map.
> > -
> > -- #address-cells:
> > -    Usage: required
> > -    Value type: <u32>
> > -    Definition: Must be one. Child node 'reg' property should define ADC
> > -            channel number.
> > -
> > -- #size-cells:
> > -    Usage: required
> > -    Value type: <u32>
> > -    Definition: Must be zero.
> > -
> > -- #io-channel-cells:
> > -    Usage: required
> > -    Value type: <u32>
> > -    Definition: Must be one. For details about IIO bindings see:
> > -            Documentation/devicetree/bindings/iio/iio-bindings.txt
> > -
> > -- interrupts:
> > -    Usage: optional
> > -    Value type: <prop-encoded-array>
> > -    Definition: End of conversion interrupt.
> > -
> > -Channel node properties:
> > -
> > -- reg:
> > -    Usage: required
> > -    Value type: <u32>
> > -    Definition: ADC channel number.
> > -            See include/dt-bindings/iio/qcom,spmi-vadc.h
> > -
> > -- label:
> > -    Usage: required for "qcom,spmi-adc5" and "qcom,spmi-adc-rev2"
> > -    Value type: <empty>
> > -    Definition: ADC input of the platform as seen in the schematics.
> > -            For thermistor inputs connected to generic AMUX or GPIO inputs
> > -            these can vary across platform for the same pins. Hence select
> > -            the platform schematics name for this channel.
> > -
> > -- qcom,decimation:
> > -    Usage: optional
> > -    Value type: <u32>
> > -    Definition: This parameter is used to decrease ADC sampling rate.
> > -            Quicker measurements can be made by reducing decimation ratio.
> > -            - For compatible property "qcom,spmi-vadc", valid values are
> > -              512, 1024, 2048, 4096. If property is not found, default value
> > -              of 512 will be used.
> > -            - For compatible property "qcom,spmi-adc5", valid values are 250, 420
> > -              and 840. If property is not found, default value of 840 is used.
> > -            - For compatible property "qcom,spmi-adc-rev2", valid values are 256,
> > -              512 and 1024. If property is not present, default value is 1024.
> > -
> > -- qcom,pre-scaling:
> > -    Usage: optional
> > -    Value type: <u32 array>
> > -    Definition: Used for scaling the channel input signal before the signal is
> > -            fed to VADC. The configuration for this node is to know the
> > -            pre-determined ratio and use it for post scaling. Select one from
> > -            the following options.
> > -            <1 1>, <1 3>, <1 4>, <1 6>, <1 20>, <1 8>, <10 81>, <1 10>
> > -            If property is not found default value depending on chip will be used.
> > -
> > -- qcom,ratiometric:
> > -    Usage: optional
> > -    Value type: <empty>
> > -    Definition: Channel calibration type.
> > -            - For compatible property "qcom,spmi-vadc", if this property is
> > -              specified VADC will use the VDD reference (1.8V) and GND for
> > -              channel calibration. If property is not found, channel will be
> > -              calibrated with 0.625V and 1.25V reference channels, also
> > -              known as absolute calibration.
> > -            - For compatible property "qcom,spmi-adc5" and "qcom,spmi-adc-rev2",
> > -              if this property is specified VADC will use the VDD reference
> > -              (1.875V) and GND for channel calibration. If property is not found,
> > -              channel will be calibrated with 0V and 1.25V reference channels,
> > -              also known as absolute calibration.
> > -
> > -- qcom,hw-settle-time:
> > -    Usage: optional
> > -    Value type: <u32>
> > -    Definition: Time between AMUX getting configured and the ADC starting
> > -            conversion. The 'hw_settle_time' is an index used from valid values
> > -            and programmed in hardware to achieve the hardware settling delay.
> > -            - For compatible property "qcom,spmi-vadc" and "qcom,spmi-adc-rev2",
> > -              Delay = 100us * (hw_settle_time) for hw_settle_time < 11,
> > -              and 2ms * (hw_settle_time - 10) otherwise.
> > -              Valid values are: 0, 100, 200, 300, 400, 500, 600, 700, 800,
> > -              900 us and 1, 2, 4, 6, 8, 10 ms.
> > -              If property is not found, channel will use 0us.
> > -            - For compatible property "qcom,spmi-adc5", delay = 15us for
> > -              value 0, 100us * (value) for values < 11,
> > -              and 2ms * (value - 10) otherwise.
> > -              Valid values are: 15, 100, 200, 300, 400, 500, 600, 700, 800,
> > -              900 us and 1, 2, 4, 6, 8, 10 ms
> > -              Certain controller digital versions have valid values of
> > -              15, 100, 200, 300, 400, 500, 600, 700, 1, 2, 4, 8, 16, 32, 64, 128 ms
> > -              If property is not found, channel will use 15us.
> > -
> > -- qcom,avg-samples:
> > -    Usage: optional
> > -    Value type: <u32>
> > -    Definition: Number of samples to be used for measurement.
> > -            Averaging provides the option to obtain a single measurement
> > -            from the ADC that is an average of multiple samples. The value
> > -            selected is 2^(value).
> > -            - For compatible property "qcom,spmi-vadc", valid values
> > -              are: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512
> > -              If property is not found, 1 sample will be used.
> > -            - For compatible property "qcom,spmi-adc5" and "qcom,spmi-adc-rev2",
> > -              valid values are: 1, 2, 4, 8, 16
> > -              If property is not found, 1 sample will be used.
> > -
> > -NOTE:
> > -
> > -For compatible property "qcom,spmi-vadc" following channels, also known as
> > -reference point channels, are used for result calibration and their channel
> > -configuration nodes should be defined:
> > -VADC_REF_625MV and/or VADC_SPARE1(based on PMIC version) VADC_REF_1250MV,
> > -VADC_GND_REF and VADC_VDD_VADC.
> > -
> > -Example:
> > -
> > -#include <dt-bindings/iio/qcom,spmi-vadc.h>
> > -#include <linux/irq.h>
> > -/* ... */
> > -
> > -	/* VADC node */
> > -	pmic_vadc: vadc@...0 {
> > -		compatible = "qcom,spmi-vadc";
> > -		reg = <0x3100>;
> > -		interrupts = <0x0 0x31 0x0 IRQ_TYPE_EDGE_RISING>;
> > -		#address-cells = <1>;
> > -		#size-cells = <0>;
> > -		#io-channel-cells = <1>;
> > -		io-channel-ranges;
> > -
> > -		/* Channel node */
> > -		adc-chan@...C_LR_MUX10_USB_ID {
> > -			reg = <VADC_LR_MUX10_USB_ID>;
> > -			qcom,decimation = <512>;
> > -			qcom,ratiometric;
> > -			qcom,hw-settle-time = <200>;
> > -			qcom,avg-samples = <1>;
> > -			qcom,pre-scaling = <1 3>;
> > -		};
> > -	};
> > -
> > -	/* IIO client node */
> > -	usb {
> > -		io-channels = <&pmic_vadc VADC_LR_MUX10_USB_ID>;
> > -		io-channel-names = "vadc";
> > -	};
> > diff --git a/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.yaml b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.yaml
> > new file mode 100644
> > index 0000000..de8d243
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.yaml
> > @@ -0,0 +1,252 @@
> > +# SPDX-License-Identifier: GPL-2.0-only
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/adc/qcom,spmi-vadc.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Qualcomm's SPMI PMIC ADC
> > +
> > +maintainers:
> > +  - Andy Gross <agross@...nel.org>
> > +  - Bjorn Andersson <bjorn.andersson@...aro.org>
> > +
> > +description: |
> > +  SPMI PMIC voltage ADC (VADC) provides interface to clients to read
> > +  voltage. The VADC is a 15-bit sigma-delta ADC.
> > +  SPMI PMIC5 voltage ADC (ADC) provides interface to clients to read
> > +  voltage. The VADC is a 16-bit sigma-delta ADC.
> > +
> > +properties:
> > +  compatible:
> > +    oneOf:
> > +      - items:
> > +          - const: qcom,pms405-adc
> > +          - const: qcom,spmi-adc-rev2
> > +
> > +      - items:
> > +        - enum:
> > +          - qcom,spmi-vadc
> > +          - qcom,spmi-adc5
> > +          - qcom,spmi-adc-rev2
> > +
> > +  reg:
> > +    description: VADC base address in the SPMI PMIC register map
> > +    maxItems: 1
> > +
> > +  '#address-cells':
> > +    const: 1
> > +
> > +  '#size-cells':
> > +    const: 0
> > +
> > +  '#io-channel-cells':
> > +    const: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +    description:
> > +      End of conversion interrupt.
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - '#address-cells'
> > +  - '#size-cells'
> > +  - '#io-channel-cells'
> > +
> > +patternProperties:
> > +  "^.*@[0-9a-f]+$":
> > +    type: object
> > +    description: |
> > +      Represents the external channels which are connected to the ADC.
> > +      For compatible property "qcom,spmi-vadc" following channels, also known as
> > +      reference point channels, are used for result calibration and their channel
> > +      configuration nodes should be defined:
> > +      VADC_REF_625MV and/or VADC_SPARE1(based on PMIC version) VADC_REF_1250MV,
> > +      VADC_GND_REF and VADC_VDD_VADC.
> > +
> > +    properties:
> > +      reg:
> > +        description: |
> > +          ADC channel number.
> > +          See include/dt-bindings/iio/qcom,spmi-vadc.h
> > +
> > +      label:
> > +        $ref: /schemas/types.yaml#/definitions/string
> > +        description: |
> > +            ADC input of the platform as seen in the schematics.
> > +            For thermistor inputs connected to generic AMUX or GPIO inputs
> > +            these can vary across platform for the same pins. Hence select
> > +            the platform schematics name for this channel.
> > +
> > +      qcom,decimation:
> > +        $ref: /schemas/types.yaml#/definitions/uint32
> > +        description: |
> > +            This parameter is used to decrease ADC sampling rate.
> > +            Quicker measurements can be made by reducing decimation ratio.
> > +
> > +      qcom,pre-scaling:
> > +        description: |
> > +            Used for scaling the channel input signal before the signal is
> > +            fed to VADC. The configuration for this node is to know the
> > +            pre-determined ratio and use it for post scaling. It is a pair of
> > +            integers, denoting the numerator and denominator of the fraction by which
> > +            input signal is multiplied. For example, <1 3> indicates the signal is scaled
> > +            down to 1/3 of its value before ADC measurement.
> > +            If property is not found default value depending on chip will be used.
> > +        allOf:
> > +          - $ref: /schemas/types.yaml#/definitions/uint32-array
> > +        oneOf:
> > +          - items:
> > +            - const: 1
> > +            - enum: [ 1, 3, 4, 6, 20, 8, 10 ]
> > +
> > +          - items:
> > +            - const: 10
> > +            - const: 81
> > +
> > +      qcom,ratiometric:
> > +        description: |
> > +            Channel calibration type.
> > +            - For compatible property "qcom,spmi-vadc", if this property is
> > +              specified VADC will use the VDD reference (1.8V) and GND for
> > +              channel calibration. If property is not found, channel will be
> > +              calibrated with 0.625V and 1.25V reference channels, also
> > +              known as absolute calibration.
> > +            - For compatible property "qcom,spmi-adc5" and "qcom,spmi-adc-rev2",
> > +              if this property is specified VADC will use the VDD reference (1.875V)
> > +              and GND for channel calibration. If property is not found, channel
> > +              will be calibrated with 0V and 1.25V reference channels, also known
> > +              as absolute calibration.
> > +        type: boolean
> > +
> > +      qcom,hw-settle-time:
> > +        $ref: /schemas/types.yaml#/definitions/uint32
> > +        description: |
> > +            Time between AMUX getting configured and the ADC starting
> > +            conversion. The 'hw_settle_time' is an index used from valid values
> > +            and programmed in hardware to achieve the hardware settling delay.
> > +
> > +      qcom,avg-samples:
> > +        $ref: /schemas/types.yaml#/definitions/uint32
> > +        description: |
> > +            Number of samples to be used for measurement.
> > +            Averaging provides the option to obtain a single measurement
> > +            from the ADC that is an average of multiple samples. The value
> > +            selected is 2^(value).
> > +
> > +    required:
> > +      - reg
> > +
> > +allOf:
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: qcom,spmi-vadc
> > +
> > +    then:
> > +      patternProperties:
> > +        "^.*@[0-9a-f]+$":
> > +          properties:
> > +            qcom,decimation:
> > +              enum: [ 512, 1024, 2048, 4096 ]
> > +              default: 512
> > +
> > +            qcom,hw-settle-time:
> > +              enum: [ 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
> > +                      4, 6, 8, 10 ]
> > +              default: 0
> > +
> > +            qcom,avg-samples:
> > +              enum: [ 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 ]
> > +              default: 1
> > +
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: qcom,spmi-adc-rev2
> > +
> > +    then:
> > +      patternProperties:
> > +        "^.*@[0-9a-f]+$":
> > +          properties:
> > +            qcom,decimation:
> > +              enum: [ 256, 512, 1024 ]
> > +              default: 1024
> > +
> > +            qcom,hw-settle-time:
> > +              enum: [ 0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
> > +                      4, 6, 8, 10 ]
> > +              default: 0
> > +
> > +            qcom,avg-samples:
> > +              enum: [ 1, 2, 4, 8, 16 ]
> > +              default: 1
> > +
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: qcom,spmi-adc5
> > +
> > +    then:
> > +      patternProperties:
> > +        "^.*@[0-9a-f]+$":
> > +          properties:
> > +            qcom,decimation:
> > +              enum: [ 250, 420, 840 ]
> > +              default: 840
> > +
> > +            qcom,hw-settle-time:
> > +              enum: [ 15, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1, 2,
> > +                      4, 6, 8, 10, 16, 32, 64, 128 ]
> > +              default: 15
> > +
> > +            qcom,avg-samples:
> > +              enum: [ 1, 2, 4, 8, 16 ]
> > +              default: 1
> > +
> > +examples:
> > +  - |
> > +    spmi_bus {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +      /* VADC node */
> > +      pmic_vadc: adc@...0 {
> > +        compatible = "qcom,spmi-vadc";
> > +        reg = <0x3100>;
> > +        interrupts = <0x0 0x31 0x0 0x1>;
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +        #io-channel-cells = <1>;
> > +        io-channel-ranges;
> > +
> > +        /* Channel node */
> > +        adc-chan@39 {
> > +          reg = <0x39>;
> > +          qcom,decimation = <512>;
> > +          qcom,ratiometric;
> > +          qcom,hw-settle-time = <200>;
> > +          qcom,avg-samples = <1>;
> > +          qcom,pre-scaling = <1 3>;
> > +        };
> > +
> > +        adc-chan@9 {
> > +          reg = <0x9>;
> > +        };
> > +
> > +        adc-chan@a {
> > +          reg = <0xa>;
> > +        };
> > +
> > +        adc-chan@e {
> > +          reg = <0xe>;
> > +        };
> > +
> > +        adc-chan@f {
> > +          reg = <0xf>;
> > +        };
> > +      };
> > +    };  
> 

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