linux-kernel - Re: [PATCH 1/2] dt-binding: iio: dac8771: Add TI DAC8771 binding

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Date:   Mon, 23 Dec 2019 14:44:42 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Dan Murphy <dmurphy@...com>
Cc:     <linux-iio@...r.kernel.org>, <knaack.h@....de>, <lars@...afoo.de>,
        <pmeerw@...erw.net>, <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 1/2] dt-binding: iio: dac8771: Add TI DAC8771 binding

On Tue, 17 Dec 2019 08:07:30 -0600
Dan Murphy <dmurphy@...com> wrote:

> Add the TI DAC8771 DT binding.
> 
> Datasheet:
> http://www.ti.com/lit/ds/symlink/dac8771.pdf
> 
> Signed-off-by: Dan Murphy <dmurphy@...com>
> CC: Rob Herring <robh+dt@...nel.org>
> ---
>  .../bindings/iio/dac/ti,dac8771.yaml          | 89 +++++++++++++++++++
>  1 file changed, 89 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/dac/ti,dac8771.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/dac/ti,dac8771.yaml b/Documentation/devicetree/bindings/iio/dac/ti,dac8771.yaml
> new file mode 100644
> index 000000000000..6aba6789d36c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/dac/ti,dac8771.yaml
> @@ -0,0 +1,89 @@
> +# SPDX-License-Identifier: GPL-2.0
If possible, it is preferred for new bindings to be dual licensed as 

(GPL-2.0-only OR BSD-2-Clause)


> +# Copyright (C) 2019 Texas Instruments Incorporated
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/bindings/iio/dac/ti,dac8771.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Texas Instruments DAC8771
> +
> +maintainers:
> +  - Dan Murphy <dmurphy@...com>
> +
> +description: |
> +  The DAC8771 is a single channel, precision, fully integrated 16-bit digital
> +  to analog converter (DAC) with adaptive power management, and is designed to
> +  meet the requirements of industrial control applications.
> +
> +  Specifications can be found at:
> +    http://www.ti.com/lit/ds/symlink/dac8771.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,dac8771
> +
> +  reg:
> +    maxItems: 1
> +
> +  reset-gpios:
> +    description: |
> +       GPIO used for hardware reset.
> +
> +  loaddacs-gpios:
> +    description: |
> +       GPIO used to shift the data from the SPI FIFO to the processing engine.
> +
> +  spi-max-frequency:
> +    maximum: 25000000
> +
> +  vref-supply:
> +    description: Phandle to the external reference voltage supply.
> +
> +  ti,output-range:
> +    description: Output range of the DAC
> +       0 - Voltage output 0 to +5 V (default)
Hmm. I'm never keen on opaque bindings, but sometimes things
are just too complex to break out as individual fields.

So I guess this is the best we can do.

> +       1 - Voltage output 0 to +10 V
> +       2 - Voltage output ±5 V
> +       3 - Voltage output ±10 V
> +       4 - Current output 3.5 mA to 23.5 mA
> +       5 - Current output 0 to 20 mA
> +       6 - Current output 0 to 24 mA
> +       7 - Current output ±24 mA
> +       8 - Voltage output 0 to +6 V
> +       9 - Voltage output 0 to +12 V
> +       10 - Voltage output ±6 V
> +       11 - Voltage output ±12 V
> +       12 - Current output 4 mA to 20 mA
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint8
> +      - enum: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
> +
> +  interrupts:
> +    description: IRQ line for the DAC
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - vref-supply
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    spi {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +  
> +      dac@0 {
> +        compatible = "ti,dac8771";
> +        reg = <0>;
> +        spi-max-frequency = <25000000>;
> +        vref-supply = <&ldo3_reg>;
> +        ti,output-range = <2>;
> +        interrupts = <16>;
> +        interrupt-parent = <&gpio1>;
> +        loaddacs-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>;
> +        reset-gpios = <&gpio1 27 GPIO_ACTIVE_LOW>;
> +      };
> +    };