linux-kernel - Re: [PATCH v3 1/3] dt-bindings: iio: dac: AD5766 yaml documentation

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Date:   Sun, 13 Dec 2020 14:51:11 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Cristian Pop <cristian.pop@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <robh+dt@...nel.org>
Subject: Re: [PATCH v3 1/3] dt-bindings: iio: dac: AD5766 yaml documentation

On Tue, 8 Dec 2020 15:19:55 +0200
Cristian Pop <cristian.pop@...log.com> wrote:

> This adds device tree bindings for the AD5766 DAC.
> 
> Signed-off-by: Cristian Pop <cristian.pop@...log.com>
> ---
>  Changes in v3:
> 	- Fix errors
>  .../bindings/iio/dac/adi,ad5766.yaml          | 58 +++++++++++++++++++
>  1 file changed, 58 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/dac/adi,ad5766.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad5766.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ad5766.yaml
> new file mode 100644
> index 000000000000..25ec5bc0a6c6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/dac/adi,ad5766.yaml
> @@ -0,0 +1,58 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2020 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/dac/adi,ad5766.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD5766 DAC device driver
> +
> +maintainers:
> +  - Cristian Pop <cristian.pop@...log.com>
> +
> +description: |
> +  Bindings for the Analog Devices AD5766 current DAC device. Datasheet can be
> +  found here:
> +    https://www.analog.com/media/en/technical-documentation/data-sheets/ad5766-5767.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad5766
> +      - adi,ad5767
> +
> +  reg:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 1000000
> +
> +  spi-cpol: true
> +
> +  reset-gpios:
> +    description: GPIO spec for the RESET pin. If specified, it will be
> +      asserted during driver probe.
> +    maxItems: 1

Given we've recently been bitten by this in another driver I took a look at the datasheet.
This is an active low pin (not reset) so document it as such and set logic
as appropriate in the driver.

> +
> +required:
> +  - compatible
> +  - reg
> +  - spi-max-frequency
> +  - spi-cpol
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    spi {
> +          #address-cells = <1>;
> +          #size-cells = <0>;
> +          
> +          ad5766@0 {
> +              compatible = "adi,ad5766";
> +              reg = <0>;
> +              spi-cpol;
> +              spi-max-frequency = <1000000>;
> +              reset-gpios = <&gpio 22 0>;
> +            };
> +      };