linux-kernel - Re: [PATCH v7 2/8] dt-bindings: iio: dac: adi-axi-dac: add ad3552r axi variant

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Message-ID: <20241022-flagpole-subject-51e68e81e948@spud>
Date: Tue, 22 Oct 2024 18:22:36 +0100
From: Conor Dooley <conor@...nel.org>
To: Angelo Dureghello <adureghello@...libre.com>
Cc: Nuno Sá <nuno.sa@...log.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Olivier Moysan <olivier.moysan@...s.st.com>,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, dlechner@...libre.com,
	Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v7 2/8] dt-bindings: iio: dac: adi-axi-dac: add ad3552r
 axi variant

On Mon, Oct 21, 2024 at 02:40:12PM +0200, Angelo Dureghello wrote:
> From: Angelo Dureghello <adureghello@...libre.com>
> 
> Add a new compatible and related bindigns for the fpga-based
> "ad3552r" AXI IP core, a variant of the generic AXI DAC IP.
> 
> The AXI "ad3552r" IP is a very similar HDL (fpga) variant of the
> generic AXI "DAC" IP, intended to control ad3552r and similar chips,
> mainly to reach high speed transfer rates using a QSPI DDR
> (dobule-data-rate) interface.
> 
> The ad3552r device is defined as a child of the AXI DAC, that in
> this case is acting as an SPI controller.
> 
> Note, #io-backend is present because it is possible (in theory anyway)
> to use a separate controller for the control path than that used
> for the datapath.
> 
> Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
> ---
>  .../devicetree/bindings/iio/dac/adi,axi-dac.yaml   | 69 +++++++++++++++++++++-
>  1 file changed, 66 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml b/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml
> index a55e9bfc66d7..0aabb210f26d 100644
> --- a/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml
> +++ b/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml
> @@ -19,11 +19,13 @@ description: |
>    memory via DMA into the DAC.
>  
>    https://wiki.analog.com/resources/fpga/docs/axi_dac_ip
> +  https://analogdevicesinc.github.io/hdl/library/axi_ad3552r/index.html
>  
>  properties:
>    compatible:
>      enum:
>        - adi,axi-dac-9.1.b
> +      - adi,axi-ad3552r
>  
>    reg:
>      maxItems: 1
> @@ -36,7 +38,12 @@ properties:
>        - const: tx
>  
>    clocks:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2
> +
> +  clock-names:
> +    minItems: 1
> +    maxItems: 2
>  
>    '#io-backend-cells':
>      const: 0
> @@ -47,7 +54,31 @@ required:
>    - reg
>    - clocks
>  
> -additionalProperties: false
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: adi,axi-ad3552r
> +    then:
> +      $ref: /schemas/spi/spi-controller.yaml#
> +      properties:
> +        clocks:
> +          minItems: 2
> +          maxItems: 2

Is this maxItems required? It matches the outer maximum.

> +        clock-names:
> +          items:
> +            - const: s_axi_aclk
> +            - const: dac_clk

The names are the same in both cases, you can move the definitions
outside of the if/then/else stuff and only constrain it here.

> +    else:
> +      properties:
> +        clocks:
> +          maxItems: 1
> +        clock-names:
> +          items:
> +            - const: s_axi_aclk
> +
> +unevaluatedProperties: false
>  
>  examples:
>    - |
> @@ -57,6 +88,38 @@ examples:
>          dmas = <&tx_dma 0>;
>          dma-names = "tx";
>          #io-backend-cells = <0>;
> -        clocks = <&axi_clk>;
> +        clocks = <&clkc 15>;
> +        clock-names = "s_axi_aclk";
> +    };
> +
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    axi_dac: spi@...70000 {
> +        compatible = "adi,axi-ad3552r";
> +        reg = <0x44a70000 0x1000>;
> +        dmas = <&dac_tx_dma 0>;
> +        dma-names = "tx";
> +        #io-backend-cells = <0>;
> +        clocks = <&clkc 15>, <&ref_clk>;
> +        clock-names = "s_axi_aclk", "dac_clk";
> +
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        dac@0 {
> +            compatible = "adi,ad3552r";
> +            reg = <0>;
> +            reset-gpios = <&gpio0 92 GPIO_ACTIVE_HIGH>;
> +            io-backends = <&axi_dac>;
> +            spi-max-frequency = <20000000>;
> +
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            channel@0 {
> +                reg = <0>;
> +                adi,output-range-microvolt = <(-10000000) (10000000)>;
> +            };
> +        };
>      };
>  ...
> 
> -- 
> 2.45.0.rc1
> 

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