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Date: Sat, 11 Sep 2021 16:51:54 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Olivier Moysan <olivier.moysan@...s.st.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>,
Fabrice Gasnier <fabrice.gasnier@...com>,
Lars-Peter Clausen <lars@...afoo.de>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Rob Herring <robh+dt@...nel.org>,
<alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH 1/7] dt-bindings: iio: adc: add generic channel binding
On Wed, 8 Sep 2021 17:54:46 +0200
Olivier Moysan <olivier.moysan@...s.st.com> wrote:
dt-bindings: iio: adc: stm32-adc: ...
> Add ADC generic channel binding. This binding should
> be used as an alternate to legacy channel properties
> whenever possible.
> ADC generic channel binding allows to identify supported
> internal channels through the following reserved label names:
> "vddcore", "vrefint" and "vbat".
> This binding also allows to set a different sampling time
> for each channel.
>
> Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
> ---
> Note: The schema here is too permissive as either legacy or generic
> channels properties are required. These properties are mutually
> exclusive, however all attempts to describe this constraint are
> failing. In particular the following schemas and their variants have
> shown unsucessful.
>
Given yaml still drives me crazy I'll rely on Rob's expertise for suggestions
here.
The new binding text itself looks great to me.
> oneOf:
> - anyOf:
> - required:
> - st,adc-channels
> - required:
> - st,adc-diff-channels
> - anyOf:
> - required:
> - $nodename
>
> - if:
> patternProperties:
> "^channel@([0-9]|1[0-9])$":
> type: object
> then:
> properties:
> st,adc-channels: false
> st,adc-diff-channels: false
> else:
> - anyOf:
> - required:
> - st,adc-channels
> - required:
> - st,adc-diff-channels
> ---
> .../bindings/iio/adc/st,stm32-adc.yaml | 100 ++++++++++++++++--
> 1 file changed, 93 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
> index a58334c3bb76..a1f6cbe144ba 100644
> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
> @@ -222,6 +222,12 @@ patternProperties:
> '#io-channel-cells':
> const: 1
>
> + '#address-cells':
> + const: 1
> +
> + '#size-cells':
> + const: 0
> +
> interrupts:
> description: |
> IRQ Line for the ADC instance. Valid values are:
> @@ -265,7 +271,9 @@ patternProperties:
> <vinp vinn>, <vinp vinn>,... vinp and vinn are numbered from 0 to 19.
>
> Note: At least one of "st,adc-channels" or "st,adc-diff-channels" is
> - required. Both properties can be used together. Some channels can be
> + required if no adc generic channel is defined. These legacy channel
> + properties are exclusive with adc generic channel bindings.
> + Both properties can be used together. Some channels can be
> used as single-ended and some other ones as differential (mixed). But
> channels can't be configured both as single-ended and differential.
> $ref: /schemas/types.yaml#/definitions/uint32-matrix
> @@ -290,6 +298,44 @@ patternProperties:
> each channel.
> $ref: /schemas/types.yaml#/definitions/uint32-array
>
> + patternProperties:
> + "^channel@([0-9]|1[0-9])$":
> + type: object
> + $ref: "adc.yaml"
> + description: |
> + Represents the external channels which are connected to the ADC.
> +
> + properties:
> + reg:
> + items:
> + minimum: 0
> + maximum: 19
> +
> + label:
> + description: |
> + Unique name to identify which channel this is.
> + Reserved label names "vddcore", "vrefint" and "vbat"
> + are used to identify internal channels with matching names.
> +
> + diff-channels:
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + items:
> + minimum: 0
> + maximum: 19
> +
> + st,min-sample-time-nsecs:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Minimum sampling time in nanoseconds. Depending on hardware (board)
> + e.g. high/low analog input source impedance, fine tune of ADC
> + sampling time may be recommended.
> +
> + required:
> + - reg
> +
> + dependencies:
> + $nodename: [ '#address-cells', '#size-cells' ]
> +
> allOf:
> - if:
> properties:
> @@ -369,12 +415,6 @@ patternProperties:
>
> additionalProperties: false
>
> - anyOf:
> - - required:
> - - st,adc-channels
> - - required:
> - - st,adc-diff-channels
> -
> required:
> - compatible
> - reg
> @@ -451,4 +491,50 @@ examples:
> // other adc child node follow...
> };
>
> + - |
> + // Example 3: with stm32mp157c to setup ADC2 with:
> + // - internal channels 13, 14, 15.
> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> + #include <dt-bindings/clock/stm32mp1-clks.h>
> + adc122: adc@...03000 {
> + compatible = "st,stm32mp1-adc-core";
> + reg = <0x48003000 0x400>;
> + interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>;
> + clocks = <&rcc ADC12>, <&rcc ADC12_K>;
> + clock-names = "bus", "adc";
> + booster-supply = <&booster>;
> + vdd-supply = <&vdd>;
> + vdda-supply = <&vdda>;
> + vref-supply = <&vref>;
> + st,syscfg = <&syscfg>;
> + interrupt-controller;
> + #interrupt-cells = <1>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + adc@100 {
> + compatible = "st,stm32mp1-adc";
> + #io-channel-cells = <1>;
> + reg = <0x100>;
> + interrupts = <1>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + channel@13 {
> + reg = <13>;
> + label = "vrefint";
> + st,min-sample-time-nsecs = <9000>;
> + };
> + channel@14 {
> + reg = <14>;
> + label = "vddcore";
> + st,min-sample-time-nsecs = <9000>;
> + };
> + channel@15 {
> + reg = <15>;
> + label = "vbat";
> + st,min-sample-time-nsecs = <9000>;
> + };
> + };
> + };
> +
> ...
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