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Date: Tue, 18 Jun 2024 19:10:33 +0100
From: Conor Dooley <conor@...nel.org>
To: Olivier Moysan <olivier.moysan@...s.st.com>
Cc: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>,
Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
alsa-devel@...a-project.org, linux-iio@...r.kernel.org,
devicetree@...r.kernel.org,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/8] dt-bindings: iio: dfsdm: move to backend framework
On Tue, Jun 18, 2024 at 06:08:30PM +0200, Olivier Moysan wrote:
> Change the DFSDM binding to use the new IIO backend framework,
> along with the adoption of IIO generic channels.
> This binding change allows to add scaling support to the DFSDM.
>
> Keep the legacy binding as deprecated for backward compatibility.
>
> The io-backends property is supported only in generic IIO channel
> binding.
>
> - Channel description with the generic binding (Audio and Analog):
>
> Properties supersed by generic properties:
> st,adc-channels: becomes "reg" property in channel node
> st,adc-channel-names: becomes "label" property in channel node
> Properties moved to channel child node:
> st,adc-channel-types, st,adc-channel-clk-src, st,adc-alt-channel
>
> - Analog binding:
>
> DFSDM filter channel is configured as an IIO backend consumer.
> Add io-backends property in channel child nodes.
>
> DFSDM is no more configured as a channel consumer from SD modulator.
> Use of io-channels in DFSDM node is deprecated.
>
> - Audio binding:
>
> DFSDM audio DAI is configured as a channel consumer from DFSDM filter.
> No change compare to legacy.
>
> Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
> ---
> .../bindings/iio/adc/st,stm32-dfsdm-adc.yaml | 158 +++++++++++++++++-
> 1 file changed, 152 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
> index c1b1324fa132..dd414bab74c1 100644
> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
> @@ -102,9 +102,11 @@ patternProperties:
> items:
> minimum: 0
> maximum: 7
> + deprecated: true
>
> st,adc-channel-names:
> description: List of single-ended channel names.
> + deprecated: true
>
> st,filter-order:
> description: |
> @@ -118,6 +120,12 @@ patternProperties:
> "#io-channel-cells":
> const: 1
>
> + '#address-cells':
> + const: 1
> +
> + '#size-cells':
> + const: 0
> +
> st,adc-channel-types:
> description: |
> Single-ended channel input type.
> @@ -128,6 +136,7 @@ patternProperties:
> items:
> enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
> $ref: /schemas/types.yaml#/definitions/non-unique-string-array
> + deprecated: true
>
> st,adc-channel-clk-src:
> description: |
> @@ -139,6 +148,7 @@ patternProperties:
> items:
> enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
> $ref: /schemas/types.yaml#/definitions/non-unique-string-array
> + deprecated: true
>
> st,adc-alt-channel:
> description:
> @@ -147,6 +157,7 @@ patternProperties:
> If not set, channel n is connected to SPI input n.
> If set, channel n is connected to SPI input n + 1.
> type: boolean
> + deprecated: true
>
> st,filter0-sync:
> description:
> @@ -165,11 +176,65 @@ patternProperties:
> - compatible
> - reg
> - interrupts
> - - st,adc-channels
> - - st,adc-channel-names
> - st,filter-order
> - "#io-channel-cells"
>
> + patternProperties:
> + "^channel@([0-9]|1[0-9])$":
> + type: object
> + $ref: adc.yaml
> + description: Represents the external channels which are connected to the DFSDM.
> +
> + properties:
> + reg:
> + items:
> + minimum: 0
> + maximum: 8
> +
> + label:
> + description:
> + Unique name to identify which channel this is.
> +
> + st,adc-channel-types:
> + description: |
> + Single-ended channel input type.
> + - "SPI_R": SPI with data on rising edge (default)
> + - "SPI_F": SPI with data on falling edge
> + - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
> + - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
> + items:
> + enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
> + $ref: /schemas/types.yaml#/definitions/non-unique-string-array
Why is this an array? And why is the property plural? Can a channel have
more than one type?
> +
> + st,adc-channel-clk-src:
> + description: |
> + Conversion clock source.
> + - "CLKIN": external SPI clock (CLKIN x)
> + - "CLKOUT": internal SPI clock (CLKOUT) (default)
> + - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
> + - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
> + items:
> + enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
> + $ref: /schemas/types.yaml#/definitions/non-unique-string-array
Ditto here, but s/type/clock source/
Thanks,
Conor.
> +
> + st,adc-alt-channel:
> + description:
> + Must be defined if two sigma delta modulators are
> + connected on same SPI input.
> + If not set, channel n is connected to SPI input n.
> + If set, channel n is connected to SPI input n + 1.
> + type: boolean
> +
> + io-backends:
> + description:
> + From common IIO binding.
Drop this from the description.
> Used to pipe external sigma delta
> + modulator or internal ADC backend to DFSDM channel.
> +
> + required:
> + - reg
> +
> + additionalProperties: false
> +
> allOf:
> - if:
> properties:
> @@ -199,9 +264,19 @@ patternProperties:
> description:
> From common IIO binding. Used to pipe external sigma delta
> modulator or internal ADC output to DFSDM channel.
> + deprecated: true
>
> - required:
> - - io-channels
> + if:
> + required:
> + - st,adc-channels
> + then:
> + required:
> + - io-channels
> +
> + patternProperties:
> + "^channel@([0-9]|1[0-9])$":
> + required:
> + - io-backends
Why is this here, rather than with reg above? Only some channels require
a backend?
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