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Message-ID: <20200420220244.GA32739@bogus>
Date: Mon, 20 Apr 2020 17:02:44 -0500
From: Rob Herring <robh@...nel.org>
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, smohanad@...eaurora.org,
kgunda@...eaurora.org, aghayal@...eaurora.org,
Jonathan Cameron <jic23@...nel.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Mark Rutland <mark.rutland@....com>, linux-iio@...r.kernel.org,
linux-arm-msm@...r.kernel.org, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH V2 2/3] iio: adc: Add PMIC7 ADC bindings
On Wed, Apr 15, 2020 at 02:47:45PM +0530, Jishnu Prakash wrote:
> Add documentation for PMIC7 ADC peripheral.
> For the PMIC7-type PMICs, ADC peripheral is present in HW for the
> following PMICs: PMK8350, PM8350, PM8350b, PMR735a and PMR735b.
> Of these, only the ADC peripheral on PMK8350 is exposed directly to SW.
> If SW needs to communicate with ADCs on other PMICs, it specifies the
> PMIC to PMK8350 through the newly added SID register and communication
> between PMK8350 ADC and other PMIC ADCs is carried out through
> PBS(Programmable Boot Sequence) at the firmware level.
>
> In addition, add definitions for ADC channels and virtual channel
> definitions (combination of ADC channel number and PMIC SID number)
> per PMIC, to be used by ADC clients for PMIC7.
>
> Signed-off-by: Jishnu Prakash <jprakash@...eaurora.org>
> ---
> .../bindings/iio/adc/qcom,spmi-vadc.yaml | 52 +++++++++++--
> include/dt-bindings/iio/qcom,spmi-adc7-pm8350.h | 67 ++++++++++++++++
> include/dt-bindings/iio/qcom,spmi-adc7-pm8350b.h | 88 ++++++++++++++++++++++
> include/dt-bindings/iio/qcom,spmi-adc7-pmk8350.h | 46 +++++++++++
> include/dt-bindings/iio/qcom,spmi-adc7-pmr735a.h | 28 +++++++
> include/dt-bindings/iio/qcom,spmi-adc7-pmr735b.h | 28 +++++++
> include/dt-bindings/iio/qcom,spmi-vadc.h | 78 ++++++++++++++++++-
> 7 files changed, 380 insertions(+), 7 deletions(-)
> create mode 100644 include/dt-bindings/iio/qcom,spmi-adc7-pm8350.h
> create mode 100644 include/dt-bindings/iio/qcom,spmi-adc7-pm8350b.h
> create mode 100644 include/dt-bindings/iio/qcom,spmi-adc7-pmk8350.h
> create mode 100644 include/dt-bindings/iio/qcom,spmi-adc7-pmr735a.h
> create mode 100644 include/dt-bindings/iio/qcom,spmi-adc7-pmr735b.h
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.yaml b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.yaml
> index 8273981..62aa311 100644
> --- a/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.yaml
> @@ -13,7 +13,7 @@ maintainers:
> 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
> + SPMI PMIC5/PMIC7 voltage ADC (ADC) provides interface to clients to read
> voltage. The VADC is a 16-bit sigma-delta ADC.
>
> properties:
> @@ -28,6 +28,7 @@ properties:
> - qcom,spmi-vadc
> - qcom,spmi-adc5
> - qcom,spmi-adc-rev2
> + - qcom,spmi-adc7
>
> reg:
> description: VADC base address in the SPMI PMIC register map
> @@ -70,6 +71,8 @@ patternProperties:
> description: |
> ADC channel number.
> See include/dt-bindings/iio/qcom,spmi-vadc.h
> + For PMIC7 ADC, the channel numbers are specified separately per PMIC
> + in the PMIC-specific files in include/dt-bindings/iio/.
>
> label:
> $ref: /schemas/types.yaml#/definitions/string
> @@ -89,6 +92,8 @@ patternProperties:
> 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-adc7", valid values are 85, 340
> + and 1360. If property is not found, default value of 1360 is used.
We express constraints in schema now, don't duplicate with free form
text.
> - For compatible property "qcom,spmi-adc-rev2", valid values are 256,
> 512 and 1024. If property is not present, default value is 1024.
>
> @@ -122,11 +127,11 @@ patternProperties:
> 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.
> + - For compatible property "qcom,spmi-adc5", "qcom,spmi-adc7" 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:
> @@ -149,6 +154,12 @@ patternProperties:
> 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.
> + - For compatible property "qcom,spmi-adc7", delay = 15us for
> + value 0, 100us * (value) for values < 8, 1ms for value 8
> + and 2ms * (value - 8) otherwise.
> + Valid values are: 15, 100, 200, 300, 400, 500, 600, 700, 1000, 2000,
> + 4000, 8000, 16000, 32000, 64000, 128000 us.
> + If property is not found, channel will use 15us.
>
> qcom,avg-samples:
> $ref: /schemas/types.yaml#/definitions/uint32
> @@ -160,6 +171,9 @@ patternProperties:
> - For compatible property "qcom,spmi-vadc", valid values
> are: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512
> If property is not found, 1 sample will be used.
> + - For compatible property "qcom,spmi-adc5", "qcom,spmi-adc7"
> + and "qcom,spmi-adc-rev2", valid values are: 1, 2, 4, 8, 16.
> + If property is not found, 1 sample will be used.
>
> required:
> - reg
> @@ -244,6 +258,32 @@ allOf:
> enum: [ 1, 2, 4, 8, 16 ]
> default: 1
>
> + - if:
> + properties:
> + compatible:
> + contains:
> + const: qcom,spmi-adc7
> +
> + then:
> + patternProperties:
> + "^.*@[0-9a-fx]+$":
'x' should not be in unit-addresses.
> + properties:
> + qcom,decimation:
> + items:
Not an array, so 'items' doesn't make sense here.
> + enum: [ 85, 340, 1360 ]
> + default: 1360
> +
> + qcom,hw-settle-time:
> + items:
> + enum: [ 15, 100, 200, 300, 400, 500, 600, 700, 1000, 2000, 4000,
> + 8000, 16000, 32000, 64000, 128000 ]
> + default: 15
> +
> + qcom,avg-samples:
> + items:
> + enum: [ 1, 2, 4, 8, 16 ]
> + default: 1
> +
> examples:
> - |
> spmi_bus {
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