linux-kernel - Re: [PATCH v6 2/8] dt-bindings: iio: dac: adi-axi-dac: add ad3552r axi variant

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Message-ID: <a27eb208-0fa1-45cc-bb0c-18a03b6cce4e@baylibre.com>
Date: Mon, 14 Oct 2024 16:13:05 -0500
From: David Lechner <dlechner@...libre.com>
To: Angelo Dureghello <adureghello@...libre.com>, 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>
Cc: linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v6 2/8] dt-bindings: iio: dac: adi-axi-dac: add ad3552r
 axi variant

On 10/14/24 5:08 AM, 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   | 56 ++++++++++++++++++++--
>  1 file changed, 53 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..2b7e16717219 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 +38,14 @@ properties:
>        - const: tx
>  
>    clocks:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2
> +
> +  clock-names:
> +    minItems: 1
> +    items:
> +      - const: s_axi_aclk
> +      - const: dac_clk
>  
>    '#io-backend-cells':
>      const: 0
> @@ -47,7 +56,16 @@ 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
  +        clock-names:
  +          minItems: 2
  +      required:
  +        clock-names
  +    else:
  +      properties:
  +        clocks:
  +          maxItems: 1
  +        clock-names:
  +          maxItems: 1

We could make the checking of clocks more strict to show
the intent:

adi,axi-dac-9.1.b only has 1 clock and clock-names is optional.

adi,axi-ad3552r always has 2 clocks and clock-names is required.

> +
> +unevaluatedProperties: false
>  
>  examples:
>    - |
> @@ -57,6 +75,38 @@ 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 = <66000000>;
> +
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            channel@0 {
> +                reg = <0>;
> +                adi,output-range-microvolt = <(-10000000) (10000000)>;
> +            };
> +        };
>      };
>  ...
>