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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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