Re: [PATCH v1 1/3] dt-bindings: iio: adc: convert rockchip saradc bindings to yaml

[Jonathan Cameron <jic23@kernel.org>]

On Fri, 13 Mar 2020 14:29:24 +0100
Johan Jonker <jbx6244@gmail.com> wrote:

> Current dts files with 'saradc' nodes are manually verified.
> In order to automate this process rockchip-saradc.txt
> has to be converted to yaml.
> 
> Signed-off-by: Johan Jonker <jbx6244@gmail.com>

Hi Johan,

A question inline which may just be my lack of yaml knowledge
showing itself!

Jonathan

> ---
>  .../bindings/iio/adc/rockchip-saradc.txt           | 37 ----------
>  .../bindings/iio/adc/rockchip-saradc.yaml          | 79 ++++++++++++++++++++++
>  2 files changed, 79 insertions(+), 37 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt
> deleted file mode 100644
> index c2c50b598..000000000
> --- a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt
> +++ /dev/null
> @@ -1,37 +0,0 @@
> -Rockchip Successive Approximation Register (SAR) A/D Converter bindings
> -
> -Required properties:
> -- compatible: should be "rockchip,<name>-saradc" or "rockchip,rk3066-tsadc"
> -   - "rockchip,saradc": for rk3188, rk3288
> -   - "rockchip,rk3066-tsadc": for rk3036
> -   - "rockchip,rk3328-saradc", "rockchip,rk3399-saradc": for rk3328
> -   - "rockchip,rk3399-saradc": for rk3399
> -   - "rockchip,rv1108-saradc", "rockchip,rk3399-saradc": for rv1108
> -
> -- reg: physical base address of the controller and length of memory mapped
> -       region.
> -- interrupts: The interrupt number to the cpu. The interrupt specifier format
> -              depends on the interrupt controller.
> -- clocks: Must contain an entry for each entry in clock-names.
> -- clock-names: Shall be "saradc" for the converter-clock, and "apb_pclk" for
> -               the peripheral clock.
> -- vref-supply: The regulator supply ADC reference voltage.
> -- #io-channel-cells: Should be 1, see ../iio-bindings.txt
> -
> -Optional properties:
> -- resets: Must contain an entry for each entry in reset-names if need support
> -	  this option. See ../reset/reset.txt for details.
> -- reset-names: Must include the name "saradc-apb".
> -
> -Example:
> -	saradc: saradc@2006c000 {
> -		compatible = "rockchip,saradc";
> -		reg = <0x2006c000 0x100>;
> -		interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
> -		clocks = <&cru SCLK_SARADC>, <&cru PCLK_SARADC>;
> -		clock-names = "saradc", "apb_pclk";
> -		resets = <&cru SRST_SARADC>;
> -		reset-names = "saradc-apb";
> -		#io-channel-cells = <1>;
> -		vref-supply = <&vcc18>;
> -	};
> diff --git a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml
> new file mode 100644
> index 000000000..2908788b3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/rockchip-saradc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip Successive Approximation Register (SAR) A/D Converter
> +
> +maintainers:
> +  - Heiko Stuebner <heiko@sntech.de>
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: rockchip,saradc
> +      - const: rockchip,rk3066-tsadc
> +      - const: rockchip,rk3399-saradc
> +      - items:
> +          - enum:
> +            - rockchip,rk3328-saradc
> +            - rockchip,rv1108-saradc
> +          - const: rockchip,rk3399-saradc

My yaml knowledge isn't great.  Why do we have this nested
structure rather than a straight forward list?

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: converter clock
> +      - description: peripheral clock
> +
> +  clock-names:
> +    items:
> +      - const: saradc
> +      - const: apb_pclk
> +
> +  resets:
> +    maxItems: 1
> +
> +  reset-names:
> +    const: saradc-apb
> +
> +  vref-supply:
> +    description:
> +      The regulator supply for the ADC reference voltage.
> +
> +  "#io-channel-cells":
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - vref-supply
> +  - "#io-channel-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/rk3288-cru.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    saradc: saradc@2006c000 {
> +      compatible = "rockchip,saradc";
> +      reg = <0x2006c000 0x100>;
> +      interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
> +      clocks = <&cru SCLK_SARADC>, <&cru PCLK_SARADC>;
> +      clock-names = "saradc", "apb_pclk";
> +      resets = <&cru SRST_SARADC>;
> +      reset-names = "saradc-apb";
> +      vref-supply = <&vcc18>;
> +      #io-channel-cells = <1>;
> +    };