linux-kernel - Re: [PATCH V2 5/5] dt-bindings: iio/adc: ingenic: add the JZ4760(B) socs to the sadc Documentation

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Date:   Sat, 24 Jul 2021 09:33:46 +0200
From:   Christophe Branchereau <cbranchereau@...il.com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     Paul Cercueil <paul@...pouillou.net>, jic23@...nel.org,
        lars@...afoo.de, linux-mips@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org, linux@...ck-us.net,
        contact@...ur-rojek.eu
Subject: Re: [PATCH V2 5/5] dt-bindings: iio/adc: ingenic: add the JZ4760(B)
 socs to the sadc Documentation

Hello Johnathan, am I allowed to declare the property within the if
block like this?

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
# Copyright 2019-2020 Artur Rojek
%YAML 1.2
---
$id: "http://devicetree.org/schemas/iio/adc/ingenic,adc.yaml#"
$schema: "http://devicetree.org/meta-schemas/core.yaml#"

title: Ingenic JZ47xx ADC controller IIO bindings

maintainers:
  - Artur Rojek <contact@...ur-rojek.eu>

description: >
  Industrial I/O subsystem bindings for ADC controller found in
  Ingenic JZ47xx SoCs.

  ADC clients must use the format described in
  https://github.com/devicetree-org/dt-schema/blob/master/schemas/iio/iio-consumer.yaml,
  giving a phandle and IIO specifier pair ("io-channels") to the ADC controller.

properties:
  compatible:
    enum:
      - ingenic,jz4725b-adc
      - ingenic,jz4740-adc
      - ingenic,jz4760-adc
      - ingenic,jz4760b-adc
      - ingenic,jz4770-adc

  '#io-channel-cells':
    const: 1
    description:
      Must be set to <1> to indicate channels are selected by index.

  reg:
    maxItems: 1

  clocks:
    maxItems: 1

  clock-names:
    items:
      - const: adc

  interrupts:
    maxItems: 1

allOf:
  - if:
      properties:
        compatible:
          contains:
            enum:
              - ingenic,jz4760b-adc
then:
  properties:
    ingenic,use-internal-divider:
      description:
        If present, battery voltage is read from the VBAT_IR pin, which has an
        internal 1/4 divider. If absent, it is read through the VBAT_ER pin,
        which does not have such a divider.
      type: boolean

required:
  - compatible
  - '#io-channel-cells'
  - reg
  - clocks
  - clock-names
  - interrupts

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/jz4740-cgu.h>
    #include <dt-bindings/iio/adc/ingenic,adc.h>

    adc@...70000 {
            compatible = "ingenic,jz4740-adc";
            #io-channel-cells = <1>;

            reg = <0x10070000 0x30>;

            clocks = <&cgu JZ4740_CLK_ADC>;
            clock-names = "adc";

            interrupt-parent = <&intc>;
            interrupts = <18>;
    };

On Fri, Jul 23, 2021 at 6:17 PM Jonathan Cameron
<Jonathan.Cameron@...wei.com> wrote:
>
> On Fri, 23 Jul 2021 10:58:13 +0200
> Christophe Branchereau <cbranchereau@...il.com> wrote:
>
> > The jz4760b variant differs slightly from the jz4760, add a property to
> > let users sample the internal divider if needed and document it.
> >
> > Signed-off-by: Christophe Branchereau <cbranchereau@...il.com>
> > ---
> >  .../devicetree/bindings/iio/adc/ingenic,adc.yaml         | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/iio/adc/ingenic,adc.yaml b/Documentation/devicetree/bindings/iio/adc/ingenic,adc.yaml
> > index 433a3fb55a2e..0dc42959a64f 100644
> > --- a/Documentation/devicetree/bindings/iio/adc/ingenic,adc.yaml
> > +++ b/Documentation/devicetree/bindings/iio/adc/ingenic,adc.yaml
> > @@ -23,6 +23,8 @@ properties:
> >      enum:
> >        - ingenic,jz4725b-adc
> >        - ingenic,jz4740-adc
> > +      - ingenic,jz4760-adc
> > +      - ingenic,jz4760b-adc
> >        - ingenic,jz4770-adc
> >
> >    '#io-channel-cells':
> > @@ -43,6 +45,13 @@ properties:
> >    interrupts:
> >      maxItems: 1
> >
> > +  ingenic,use-internal-divider:
> > +    description:
> > +      This property can be used to set VBAT_SEL in the JZ4760B CFG register
> > +      to sample the battery voltage from the internal divider. If absent, it
> > +      will sample the external divider.
> > +    type: boolean
> > +
> See reply to the v1 patch for hint on how to 'enforce' that this
> only exists for the jz4760b
>
> Thanks,
>
> Jonathan
>
> >  required:
> >    - compatible
> >    - '#io-channel-cells'
>